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Long-Term Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 9 Months Ended | 9 Months Ended | 1 Months Ended | 9 Months Ended | |||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Sep. 30, 2013
|
Sep. 30, 2012
|
Sep. 30, 2013
|
Sep. 30, 2012
|
Dec. 31, 2012
|
Mar. 31, 2011
Credit Facility [Member]
|
Sep. 30, 2013
Credit Facility [Member]
|
Jun. 30, 2013
Credit Facility [Member]
|
Mar. 31, 2013
Credit Facility [Member]
|
Sep. 30, 2013
Credit Facility [Member]
|
Dec. 31, 2012
Credit Facility [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Maximum [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Minimum [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Senior secured revolving credit facility [Member]
|
Dec. 31, 2012
Credit Facility [Member]
Senior secured revolving credit facility [Member]
|
Mar. 09, 2011
Credit Facility [Member]
Senior secured revolving credit facility [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Senior secured revolving credit facility [Member]
Maximum [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Senior secured revolving credit facility [Member]
Minimum [Member]
|
Jul. 31, 2012
Credit Facility [Member]
Term Loan [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Term Loan [Member]
|
Dec. 31, 2012
Credit Facility [Member]
Term Loan [Member]
|
Jul. 26, 2012
Credit Facility [Member]
Term Loan [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Interest Rate Option One [Member]
Senior secured revolving credit facility [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Interest Rate Option One [Member]
Senior secured revolving credit facility [Member]
Maximum [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Interest Rate Option One [Member]
Senior secured revolving credit facility [Member]
Minimum [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Interest Rate Option One [Member]
Term Loan [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Interest Rate Option One [Member]
Term Loan [Member]
Maximum [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Interest Rate Option One [Member]
Term Loan [Member]
Minimum [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Interest Rate Option Two [Member]
Senior secured revolving credit facility [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Interest Rate Option Two [Member]
Senior secured revolving credit facility [Member]
Maximum [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Interest Rate Option Two [Member]
Senior secured revolving credit facility [Member]
Minimum [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Interest Rate Option Two [Member]
Term Loan [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Interest Rate Option Two [Member]
Term Loan [Member]
Maximum [Member]
|
Sep. 30, 2013
Credit Facility [Member]
Interest Rate Option Two [Member]
Term Loan [Member]
Minimum [Member]
|
|
| Debt Instrument [Line Items] | ||||||||||||||||||||||||||||||||||
| Credit facility, maximum amount | $ 700.0 | $ 500.0 | ||||||||||||||||||||||||||||||||
| 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% | 2.50% | 1.50% | 1.50% | 0.50% | 1.50% | 0.50% | ||||||||||||||||||||||||
| Variable rate basis | LIBOR | 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% | ||||||||||||||||||||||||||||||||
| Repayment of all amounts outstanding under the Prior Credit Facility by using borrowings under the new Credit Facility | 196.0 | 500.0 | ||||||||||||||||||||||||||||||||
| Deferred financing costs | 5.7 | 4.5 | ||||||||||||||||||||||||||||||||
| Long-term debt, weighted average interest rate | 2.18% | 2.18% | 1.96% | |||||||||||||||||||||||||||||||
| Credit facility, amount borrowed | 250.0 | 513.0 | ||||||||||||||||||||||||||||||||
| Credit facility, amount repaid | 262.5 | 12.5 | 25.5 | |||||||||||||||||||||||||||||||
| Credit facility, amount outstanding | 950.0 | 950.0 | 487.5 | 950.0 | 950.0 | 487.5 | 500.0 | 0 | 450.0 | 487.5 | ||||||||||||||||||||||||
| Foreign currency borrowings outstanding | 0 | 0 | 0 | |||||||||||||||||||||||||||||||
| Aggregate annual maturities, 2013 | 18.8 | 18.8 | ||||||||||||||||||||||||||||||||
| Aggregate annual maturities, 2014 | 81.2 | 81.2 | ||||||||||||||||||||||||||||||||
| Aggregate annual maturities, 2015 | 100.0 | 100.0 | ||||||||||||||||||||||||||||||||
| Aggregate annual maturities, 2016 | 750.0 | 750.0 | ||||||||||||||||||||||||||||||||
| Interest expense | $ 6.7 | $ 5.0 | $ 21.1 | $ 12.4 | ||||||||||||||||||||||||||||||