Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Schedule of Long-Term Debt (Detail)

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Long-Term Debt - Schedule of Long-Term Debt (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Debt Disclosure [Abstract]    
Borrowings under the senior secured credit facility $ 950,000,000 $ 487,500,000
Capital leases 100,000 100,000
Total 950,100,000 487,600,000
Less: current portion 75,061,000 56,302,000
Long-term portion $ 875,018,000 $ 431,305,000