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Indebtedness - Debt Outstanding (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Bank debt $ 86,427 $ 713,221
Senior notes 738,101 0
Senior subordinated notes 1,826,775 2,317,603
Total debt 2,651,303 3,030,824
4.875% Senior Notes Due 2025    
Debt Instrument [Line Items]    
Senior notes 738,101 0
Notes Payable to Banks | 1.8% Bank Debt    
Debt Instrument [Line Items]    
Bank debt 86,427 713,221
Senior Subordinated Notes | 6.75% Senior Subordinated Notes Due 2020    
Debt Instrument [Line Items]    
Senior subordinated notes 0 493,843
Senior Subordinated Notes | 5.75% Senior Subordinated Notes Due 2021    
Debt Instrument [Line Items]    
Senior subordinated notes 494,095 493,197
Senior Subordinated Notes | 5.00% Senior Subordinated Notes Due 2022    
Debt Instrument [Line Items]    
Senior subordinated notes 592,223 591,180
Senior Subordinated Notes | 5.00% Senior Subordinated Notes Due 2023    
Debt Instrument [Line Items]    
Senior subordinated notes $ 740,457 $ 739,383