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Long-Term Debt - Additional Information (Detail) (USD $)
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12 Months Ended | 1 Months Ended | 3 Months Ended | 1 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||||
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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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Dec. 31, 2011
Prior Credit Facility [Member]
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Dec. 31, 2010
Prior Credit Facility [Member]
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Jul. 21, 2006
Prior Credit Facility [Member]
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Jul. 21, 2006
Prior Credit Facility [Member]
Term Loan [Member]
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Sep. 30, 2007
Prior Credit Facility [Member]
Senior secured revolving credit facility [Member]
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Sep. 12, 2007
Prior Credit Facility [Member]
Senior secured revolving credit facility [Member]
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Jul. 21, 2006
Prior Credit Facility [Member]
Senior secured revolving credit facility [Member]
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Mar. 31, 2011
Prior Credit Facility [Member]
Interest Rate Option One [Member]
Term Loan [Member]
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Mar. 31, 2011
Prior Credit Facility [Member]
Interest Rate Option One [Member]
Senior secured revolving credit facility [Member]
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Mar. 31, 2011
Prior Credit Facility [Member]
Interest Rate Option Two [Member]
Term Loan [Member]
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Mar. 31, 2011
Prior Credit Facility [Member]
Interest Rate Option Two [Member]
Senior secured revolving credit facility [Member]
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Jul. 31, 2012
New 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]
Term Loan [Member]
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Jul. 26, 2012
New Credit Facility [Member]
Term Loan [Member]
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Dec. 31, 2012
New Credit Facility [Member]
Senior secured revolving credit facility [Member]
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Dec. 31, 2012
New Credit Facility [Member]
Secured Debt [Member]
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Dec. 31, 2011
New Credit Facility [Member]
Secured Debt [Member]
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Dec. 31, 2012
New Credit Facility [Member]
Interest Rate Option One [Member]
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Dec. 31, 2012
New Credit Facility [Member]
Interest Rate Option One [Member]
Term Loan [Member]
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Dec. 31, 2012
New Credit Facility [Member]
Interest Rate Option Two [Member]
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Dec. 31, 2012
New Credit Facility [Member]
Interest Rate Option Two [Member]
Term Loan [Member]
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Dec. 31, 2012
Maximum [Member]
New Credit Facility [Member]
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Dec. 31, 2012
Maximum [Member]
New Credit Facility [Member]
Interest Rate Option One [Member]
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Dec. 31, 2012
Maximum [Member]
New Credit Facility [Member]
Interest Rate Option One [Member]
Term Loan [Member]
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Dec. 31, 2012
Maximum [Member]
New Credit Facility [Member]
Interest Rate Option Two [Member]
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Dec. 31, 2012
Maximum [Member]
New Credit Facility [Member]
Interest Rate Option Two [Member]
Term Loan [Member]
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Dec. 31, 2012
Minimum [Member]
New Credit Facility [Member]
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Dec. 31, 2012
Minimum [Member]
New Credit Facility [Member]
Interest Rate Option One [Member]
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Dec. 31, 2012
Minimum [Member]
New Credit Facility [Member]
Interest Rate Option One [Member]
Term Loan [Member]
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Dec. 31, 2012
Minimum [Member]
New Credit Facility [Member]
Interest Rate Option Two [Member]
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Dec. 31, 2012
Minimum [Member]
New Credit Facility [Member]
Interest Rate Option Two [Member]
Term Loan [Member]
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| Debt Instrument [Line Items] | ||||||||||||||||||||||||||||||||||||||
| Senior secured revolving credit facility | $ 300,000,000 | $ 200,000,000 | $ 250,000,000 | $ 100,000,000 | $ 700,000,000 | $ 500,000,000 | ||||||||||||||||||||||||||||||||
| Increase in maximum aggregate borrowing capacity | 150,000,000 | |||||||||||||||||||||||||||||||||||||
| Interest rate spread on variable rate | 1.50% | 0.50% | 2.50% | 2.50% | 1.50% | 1.50% | 1.50% | 0.50% | ||||||||||||||||||||||||||||||
| Variable rate basis | LIBOR | LIBOR | Base rate | Base rate | 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 | ||||||||||||||||||||||||||||||
| Interest rate spread on variable rate | 1.25% | 0.25% | 1.50% | 0.50% | ||||||||||||||||||||||||||||||||||
| Credit facility maturity | 5 years | |||||||||||||||||||||||||||||||||||||
| New Credit Facility, maturity date | Mar. 09, 2016 | |||||||||||||||||||||||||||||||||||||
| Base rate in excess of Federal Funds Rate | 0.50% | |||||||||||||||||||||||||||||||||||||
| Base rate in excess of one-month LIBOR | 1.00% | |||||||||||||||||||||||||||||||||||||
| Line of credit facility, unused capacity, commitment fee percentage | 0.50% | 0.25% | ||||||||||||||||||||||||||||||||||||
| Repayment of all amounts outstanding under the prior credit facility by using borrowings under the new credit facility | 196,000,000 | |||||||||||||||||||||||||||||||||||||
| Debt issuance costs in connection with term loan | 5,700,000 | 4,500,000 | ||||||||||||||||||||||||||||||||||||
| Repayment of all amounts outstanding under the prior credit facility by using borrowings under the new credit facility | 500,000,000 | |||||||||||||||||||||||||||||||||||||
| Long-term debt, weighted average interest rate | 1.96% | 1.89% | ||||||||||||||||||||||||||||||||||||
| Credit facility, amount borrowed | 54,000,000 | 427,000,000 | 1,428,000,000 | 859,700,000 | ||||||||||||||||||||||||||||||||||
| Credit facility, amount repaid | 228,900,000 | 487,000,000 | 1,142,500,000 | 657,700,000 | ||||||||||||||||||||||||||||||||||
| Credit facility, amount outstanding | 487,500,000 | 202,000,000 | 487,500,000 | 202,000,000 | 487,500,000 | 0 | ||||||||||||||||||||||||||||||||
| 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 credit facility | $ 914,000 | $ 914,000 | ||||||||||||||||||||||||||||||||||||