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Long-Term Debt - Additional Information (Detail) (USD $)
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1 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | ||||||||||||||
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Jul. 31, 2012
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Mar. 31, 2011
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Sep. 30, 2012
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Jun. 30, 2012
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Mar. 31, 2012
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Sep. 30, 2011
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Sep. 30, 2012
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Sep. 30, 2011
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Dec. 31, 2011
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Mar. 09, 2011
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Sep. 30, 2012
Term loan
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Jul. 26, 2012
Term loan
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Sep. 30, 2012
Secured Debt
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Dec. 31, 2011
Secured Debt
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Sep. 30, 2012
Minimum
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Sep. 30, 2012
Minimum
Term loan
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Sep. 30, 2012
Maximum
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Sep. 30, 2012
Maximum
Term loan
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| Debt Instrument [Line Items] | ||||||||||||||||||
| New senior secured revolving credit facility | $ 700,000,000 | $ 500,000,000 | ||||||||||||||||
| Credit facility maturity | 5 years | |||||||||||||||||
| Credit facility maturity date | Mar. 09, 2016 | |||||||||||||||||
| Margin portion of interest rate in addition to LIBOR rate | 1.50% | 1.50% | 2.50% | 2.50% | ||||||||||||||
| Margin portion of interest rate in addition to base rate | 0.50% | 0.50% | 1.50% | 1.50% | ||||||||||||||
| Line of credit facility, unused capacity, commitment fee percentage | 0.25% | 0.50% | ||||||||||||||||
| Additional interest rate to LIBOR | 1.00% | |||||||||||||||||
| Additional interest rate to federal funds rate | 0.50% | |||||||||||||||||
| Repayment of all amounts outstanding under the prior credit facility by using borrowings under the new credit facility | 500,000,000 | 196,000,000 | ||||||||||||||||
| Debt issuance costs in connection with term loan | 5,700,000 | 5,700,000 | 4,500,000 | |||||||||||||||
| Long-term debt, weighted average interest rate | 1.97% | 1.89% | ||||||||||||||||
| Company borrowing from credit facility | 581,000,000 | 692,000,000 | 112,000,000 | |||||||||||||||
| Payment of credit facility | 636,000,000 | 365,000,000 | 86,000,000 | |||||||||||||||
| U.S. dollar amount outstanding under the Credit facility | 500,000,000 | 500,000,000 | 202,000,000 | |||||||||||||||
| Foreign currency borrowings outstanding | ||||||||||||||||||
| Interest expense | 5,000,000 | 3,100,000 | 12,400,000 | 9,500,000 | ||||||||||||||
| Write-off of deferred financing costs | $ 914,000 | |||||||||||||||||