Debt - Summary of Debt (Detail) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Total borrowings	$ 2,151,844	$ 2,116,821
Less: current portion of capital leases and other financing arrangements	16,994	16,265
Total long-term borrowings, net of current portion	2,134,850	2,100,556
Senior Secured Credit Facilities [Member]
Debt Instrument [Line Items]
Total borrowings	575,300
Senior Secured Credit Facilities [Member] | Term Loan B Three Loans Due Two Thousand Eighteen [Member]
Debt Instrument [Line Items]
Total borrowings	129,645	129,645
Senior Secured Credit Facilities [Member] | Term Loan B Four Loans Due Two Thousand Eighteen [Member]
Debt Instrument [Line Items]
Total borrowings	445,694	445,694
Senior Secured Notes, Due 2018 [Member]
Debt Instrument [Line Items]
Total borrowings	625,425	625,489
Junior Lien Secured Notes, Due 2018 [Member]
Debt Instrument [Line Items]
Total borrowings	531,581	500,265
Senior Notes, Due 2018 [Member]
Debt Instrument [Line Items]
Total borrowings	371,028	370,139
Capital Leases and Other Financing Arrangements [Member]
Debt Instrument [Line Items]
Total borrowings	$ 48,471	$ 45,589