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Long-term Debt - Long-Term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Debt $ 2,470,676 $ 1,919,484
Debt, Less current maturities (23,149) (21,332)
Debt, excluding current maturities 2,447,527 1,898,152
Deferred financing costs 32,526 28,034
Deferred financing costs, Less current maturities (5,293) (4,823)
Deferred financing costs, excluding current maturities 27,233 23,211
Debt, net of deferred financing costs 2,438,150 1,891,450
Debt, net of deferred financing costs, Less current maturities (17,856) (16,509)
Debt, net of deferred financing costs, excluding current maturities 2,420,294 1,874,941
Senior Credit Facility [Member]    
Debt Instrument [Line Items]    
Debt 525,000 373,750
Deferred financing costs 6,485 7,058
Debt, net of deferred financing costs 518,515 366,692
5 7/8% Senior Subordinated Notes [Member]    
Debt Instrument [Line Items]    
Debt 500,000 500,000
Deferred financing costs 7,939 8,219
Debt, net of deferred financing costs 492,061 491,781
5% Senior Subordinated Notes [Member]    
Debt Instrument [Line Items]    
Debt 535,000 535,000
Deferred financing costs 6,269 6,451
Debt, net of deferred financing costs 528,731 528,549
5 3/8% Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt 510,000 510,000
Deferred financing costs 6,148 6,306
Debt, net of deferred financing costs 503,852 503,694
5 3/4% Senior Notes [Member]    
Debt Instrument [Line Items]    
Debt 400,000  
Deferred financing costs 5,685  
Debt, net of deferred financing costs 394,315  
Other Notes with Various Rates and Terms [Member]    
Debt Instrument [Line Items]    
Debt 676 734
Debt, net of deferred financing costs $ 676 $ 734