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Long-Term Debt - Additional Information (Detail) (USD $)
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1 Months Ended | 12 Months Ended | 3 Months Ended | 1 Months Ended | 3 Months Ended | 12 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | |||||||||||||||||
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Jul. 31, 2012
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Dec. 31, 2012
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Dec. 31, 2011
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Dec. 31, 2010
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Mar. 31, 2011
Term loan portion [Member]
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Jul. 21, 2006
Term loan portion [Member]
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Sep. 30, 2007
Revolving credit facility [Member]
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Mar. 31, 2011
Revolving credit facility [Member]
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Sep. 12, 2007
Revolving credit facility [Member]
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Jul. 21, 2006
Revolving credit facility [Member]
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Dec. 31, 2012
Term loan [Member]
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Jul. 26, 2012
Term loan [Member]
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Dec. 31, 2012
Secured Debt [Member]
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Dec. 31, 2011
Secured Debt [Member]
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Dec. 31, 2011
Prior Credit Facility [Member]
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Jul. 21, 2006
Prior Credit Facility [Member]
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Mar. 31, 2011
New Credit Facility [Member]
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Dec. 31, 2012
New Credit Facility [Member]
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Dec. 31, 2011
New Credit Facility [Member]
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Mar. 09, 2011
New Credit Facility [Member]
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Dec. 31, 2012
New Credit Facility [Member]
Revolving credit facility [Member]
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Dec. 31, 2012
New Credit Facility [Member]
Term loan [Member]
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Dec. 31, 2012
Maximum [Member]
Term loan [Member]
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Dec. 31, 2012
Maximum [Member]
New Credit Facility [Member]
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Dec. 31, 2012
Minimum [Member]
Term loan [Member]
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Dec. 31, 2012
Minimum [Member]
New Credit Facility [Member]
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| Debt Instrument [Line Items] | ||||||||||||||||||||||||||
| Senior secured revolving credit facility | $ 200,000,000 | $ 250,000,000 | $ 100,000,000 | $ 500,000,000 | $ 300,000,000 | $ 700,000,000 | ||||||||||||||||||||
| Increase in maximum aggregate borrowing capacity | 150,000,000 | |||||||||||||||||||||||||
| Margin portion of interest rate in addition to LIBOR rate | 1.50% | 1.25% | ||||||||||||||||||||||||
| Margin portion of interest rate in addition to base rate | 0.50% | 0.25% | 1.50% | 1.50% | 0.50% | 0.50% | ||||||||||||||||||||
| Credit facility maturity | 5 years | |||||||||||||||||||||||||
| New Credit Facility, maturity date | Mar. 09, 2016 | |||||||||||||||||||||||||
| Margin portion of interest rate in addition to LIBOR rate | 2.50% | 2.50% | 1.50% | 1.50% | ||||||||||||||||||||||
| Line of credit facility, unused capacity, commitment fee percentage | 0.50% | 0.25% | ||||||||||||||||||||||||
| 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 | 4,500,000 | ||||||||||||||||||||||||
| Long-term debt, weighted average interest rate | 1.96% | 1.89% | ||||||||||||||||||||||||
| Borrowings under Long-term Lines of Credit | 1,428,000,000 | 427,000,000 | 54,000,000 | 859,700,000 | ||||||||||||||||||||||
| Credit facility amount paid | 1,142,500,000 | 487,000,000 | 228,900,000 | 657,700,000 | ||||||||||||||||||||||
| Amount outstanding | 487,500,000 | 202,000,000 | 487,500,000 | 202,000,000 | 0 | 487,500,000 | ||||||||||||||||||||
| Foreign currency borrowings outstanding | 0 | 0 | ||||||||||||||||||||||||
| Aggregate annual maturities, 2013 | 56,300,000 | |||||||||||||||||||||||||
| Aggregate annual maturities, 2014 | 81,200,000 | |||||||||||||||||||||||||
| Aggregate annual maturities, 2015 | 100,000,000 | |||||||||||||||||||||||||
| Aggregate annual maturities, 2016 | 250,000,000 | |||||||||||||||||||||||||
| Interest expense | 16,700,000 | 9,900,000 | 9,700,000 | |||||||||||||||||||||||
| Write-off of unamortized deferred financing costs resulting from the extinguishment of the prior senior secured facility | $ 914,000 | |||||||||||||||||||||||||