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Long-Term Debt - Additional Information (Detail) (USD $)
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3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | 1 Months Ended | 1 Months Ended | 6 Months Ended | ||||||||||||||||||||||||||||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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Feb. 28, 2014
Convertible Senior Notes [Member]
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Jun. 30, 2014
Convertible Senior Notes [Member]
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Mar. 31, 2014
Convertible Senior Notes [Member]
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Jun. 30, 2014
Convertible Senior Notes [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
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Feb. 28, 2014
Prepaid forward share repurchase transactions [Member]
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Mar. 31, 2014
Prepaid forward share repurchase transactions [Member]
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Feb. 28, 2014
Capped call transactions [Member]
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Mar. 31, 2014
Debt Issuance Costs [Member]
Convertible Senior Notes [Member]
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Mar. 31, 2011
Senior Secured Credit Facility [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
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Mar. 31, 2014
Senior Secured Credit Facility [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
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Dec. 31, 2013
Senior Secured Credit Facility [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Senior secured revolving credit facility [Member]
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Dec. 31, 2013
Senior Secured Credit Facility [Member]
Senior secured revolving credit facility [Member]
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Mar. 09, 2011
Senior Secured Credit Facility [Member]
Senior secured revolving credit facility [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Senior secured revolving credit facility [Member]
Maximum [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Senior secured revolving credit facility [Member]
Minimum [Member]
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Jul. 31, 2012
Senior Secured Credit Facility [Member]
Term Loan [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Term Loan [Member]
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Dec. 31, 2013
Senior Secured Credit Facility [Member]
Term Loan [Member]
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Jul. 26, 2012
Senior Secured Credit Facility [Member]
Term Loan [Member]
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Feb. 28, 2014
Senior Secured Credit Facility [Member]
Convertible Notes [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Convertible Notes [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Interest rate option one [Member]
Senior secured revolving credit facility [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Interest rate option one [Member]
Senior secured revolving credit facility [Member]
Maximum [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Interest rate option one [Member]
Senior secured revolving credit facility [Member]
Minimum [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Interest rate option one [Member]
Term Loan [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Interest rate option one [Member]
Term Loan [Member]
Maximum [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Interest rate option one [Member]
Term Loan [Member]
Minimum [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Interest rate option two [Member]
Senior secured revolving credit facility [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Interest rate option two [Member]
Senior secured revolving credit facility [Member]
Maximum [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Interest rate option two [Member]
Senior secured revolving credit facility [Member]
Minimum [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Interest rate option two [Member]
Term Loan [Member]
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Jun. 30, 2014
Senior Secured Credit Facility [Member]
Interest rate option two [Member]
Term Loan [Member]
Maximum [Member]
|
Jun. 30, 2014
Senior Secured Credit Facility [Member]
Interest rate option two [Member]
Term Loan [Member]
Minimum [Member]
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| Debt Instrument [Line Items] | ||||||||||||||||||||||||||||||||||||||||||
| Credit facility, maximum amount | $ 700,000,000 | $ 500,000,000 | ||||||||||||||||||||||||||||||||||||||||
| Credit facility, maturity period | 5 years | |||||||||||||||||||||||||||||||||||||||||
| Credit facility, expiration date | Mar. 09, 2016 | |||||||||||||||||||||||||||||||||||||||||
| Interest rate spread on variable rate | 2.50% | 1.50% | 2.50% | 1.50% | 1.50% | 0.50% | 1.50% | 0.50% | ||||||||||||||||||||||||||||||||||
| Variable rate basis | LIBOR | LIBOR | The base rate under the Credit Facility represents the highest of the Federal Funds Rate plus 0.50%, one-month LIBOR plus 1.00%, and the prime rate offered by Bank of America. | Base rate | ||||||||||||||||||||||||||||||||||||||
| Base rate in excess of Federal Funds Rate | 0.50% | |||||||||||||||||||||||||||||||||||||||||
| Base rate in excess of one-month LIBOR | 1.00% | |||||||||||||||||||||||||||||||||||||||||
| Credit facility, unused capacity, commitment fee percentage | 0.50% | 0.25% | ||||||||||||||||||||||||||||||||||||||||
| Credit facility borrowings used to repay outstanding borrowings | 196,000,000 | 500,000,000 | ||||||||||||||||||||||||||||||||||||||||
| Deferred financing costs | 21,500,000 | 5,700,000 | 4,500,000 | 2,300,000 | ||||||||||||||||||||||||||||||||||||||
| Applicable margin payable, percentage | 0.50% | |||||||||||||||||||||||||||||||||||||||||
| Consolidated leverage ratio | 2.50 to 1.00 | |||||||||||||||||||||||||||||||||||||||||
| Long-term debt, weighted average interest rate | 3.01% | 3.01% | 2.17% | |||||||||||||||||||||||||||||||||||||||
| Credit facility, amount repaid | 18,800,000 | 18,800,000 | ||||||||||||||||||||||||||||||||||||||||
| Credit facility, amount outstanding | 893,800,000 | 893,800,000 | 931,300,000 | 893,800,000 | 893,800,000 | 931,300,000 | 500,000,000 | 500,000,000 | 393,800,000 | 431,300,000 | ||||||||||||||||||||||||||||||||
| Foreign currency borrowings, outstanding | 0 | 0 | 0 | |||||||||||||||||||||||||||||||||||||||
| Aggregate principal amount of convertible senior notes issued | 1,000,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Additional principal amount of convertible notes | 150,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Convertible notes, interest rate | 2.00% | |||||||||||||||||||||||||||||||||||||||||
| Convertible notes maturity | Aug. 15, 2019 | |||||||||||||||||||||||||||||||||||||||||
| Total principal amount of convertible notes | 1,150,000,000 | 1,150,000,000 | 1,150,000,000 | |||||||||||||||||||||||||||||||||||||||
| Convertible notes, conversion feature | Holders of the Convertible Notes may convert their notes at their option under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending March 31, 2014, if the last reported sale price of the Company’s common shares for at least 20 trading days (whether or not consecutive) in a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price for the Convertible Notes on each applicable trading day; (ii) during the five business-day period immediately after any five consecutive trading day period, which we refer to as the measurement period, in which the trading price per $1,000 principal amount of Convertible Notes for each trading day of that measurement period was less than 98% of the product of the last reported sale price of the Company’s common shares and the conversion rate for the Convertible Notes for each such day; or (iii) upon the occurrence of specified corporate events. On and after May 15, 2019, holders may convert their Convertible Notes at any time, regardless of the foregoing circumstances. | |||||||||||||||||||||||||||||||||||||||||
| Convertible notes, number of trading days of threshold limit (whether or not consecutive) | 20 days | |||||||||||||||||||||||||||||||||||||||||
| Convertible notes, number of trading days of threshold limit in consecutive days | 30 days | |||||||||||||||||||||||||||||||||||||||||
| Maximum percentage of conversion price for convertible notes | 130.00% | |||||||||||||||||||||||||||||||||||||||||
| Principal amount of convertible notes | 1,000 | |||||||||||||||||||||||||||||||||||||||||
| Minimum percentage of conversion price for convertible notes | 98.00% | |||||||||||||||||||||||||||||||||||||||||
| Convertible notes initial conversion rate | 11.5908 | |||||||||||||||||||||||||||||||||||||||||
| Convertible notes initial conversion price | $ 86.28 | $ 86.28 | $ 86.28 | |||||||||||||||||||||||||||||||||||||||
| Issuance costs | 26,600,000 | |||||||||||||||||||||||||||||||||||||||||
| Additional paid-in capital | 398,436,000 | 398,436,000 | 323,860,000 | 219,100,000 | 31,900,000 | 5,100,000 | ||||||||||||||||||||||||||||||||||||
| Proceeds received from the issuance of the Convertible notes | 1,150,000,000 | 1,150,000,000 | ||||||||||||||||||||||||||||||||||||||||
| Long-term debt | 930,900,000 | |||||||||||||||||||||||||||||||||||||||||
| Effective interest rate on convertible notes | 6.20% | |||||||||||||||||||||||||||||||||||||||||
| Unamortized debt discount | 205,800,000 | 205,800,000 | ||||||||||||||||||||||||||||||||||||||||
| Convertible senior notes, carrying value of liability component | 944,200,000 | 944,200,000 | ||||||||||||||||||||||||||||||||||||||||
| Fair value of liability to convertible notes | 911,300,000 | 911,300,000 | ||||||||||||||||||||||||||||||||||||||||
| Forward share repurchase transactions amount | 685,800,000 | 685,800,000 | ||||||||||||||||||||||||||||||||||||||||
| Capped call transactions with financial institutions | 123,800,000 | |||||||||||||||||||||||||||||||||||||||||
| Interest expense | 24,200,000 | 7,500,000 | 41,900,000 | 14,300,000 | 15,200,000 | 24,000,000 | ||||||||||||||||||||||||||||||||||||
| Non-cash interest expense | 8,500,000 | 13,300,000 | ||||||||||||||||||||||||||||||||||||||||
| Amortization of deferred financing costs | 900,000 | 1,400,000 | ||||||||||||||||||||||||||||||||||||||||
| Aggregate annual maturities of credit facility, remainder of 2014 | 43,800,000 | |||||||||||||||||||||||||||||||||||||||||
| Aggregate annual maturities of credit facility, 2015 | 100,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Aggregate annual maturities of credit facility, 2016 | $ 750,000,000 | |||||||||||||||||||||||||||||||||||||||||
| Convertible senior notes due | 2019 | |||||||||||||||||||||||||||||||||||||||||