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Long-Term Obligations - Summary of Long-Term Obligations (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Net carrying value $ 3,400,125 $ 3,658,786
Less: current maturities (24,375) (16,246)
Long-term obligations 3,375,750 3,642,540
2022 [Member]    
Debt Instrument [Line Items]    
Senior notes 1,000,000 1,000,000
Senior Notes [Member] | 2016 [Member]    
Debt Instrument [Line Items]    
Secured debt   310,536
Senior Notes [Member] | 2018 [Member]    
Debt Instrument [Line Items]    
Secured debt 1,813,250 1,813,250
Senior Notes [Member] | 2019 [Member]    
Debt Instrument [Line Items]    
Secured debt 336,875 350,000
Senior Notes [Member] | 2021 [Member]    
Debt Instrument [Line Items]    
Secured debt $ 250,000  
Accounts Receivable Securitization Facility [Member] | 2018 [Member]    
Debt Instrument [Line Items]    
Secured debt   $ 185,000