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Long-Term Obligations - Summary of Long-Term Obligations (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Unamortized value of debt issuance costs $ (35,725) $ (39,374)
Net carrying value 3,112,684 3,169,672
Less: current maturities (47,834) (39,709)
Long-term obligations, net of debt issuance costs 3,064,850 3,129,963
Senior Notes [Member] | 2019 [Member]    
Debt Instrument [Line Items]    
Secured debt 0 8,814
Senior Notes [Member] | 2021 [Member]    
Debt Instrument [Line Items]    
Secured debt 400,000 400,000
Senior Notes [Member] | Senior Notes 2022 [Member]    
Debt Instrument [Line Items]    
Senior notes 1,000,000 1,000,000
Senior Notes [Member] | 2023 [Member]    
Debt Instrument [Line Items]    
Secured debt 861,316 865,655
Accounts Receivable Securitization Facility [Member]    
Debt Instrument [Line Items]    
Secured debt 0 34,000
Senior Secured A Term Loan [Member] | 2021 [Member]    
Debt Instrument [Line Items]    
Secured debt 629,688 641,875
Senior Secured B Term Loan [Member] | 2021 [Member]    
Debt Instrument [Line Items]    
Secured debt $ 257,405 $ 258,702