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Schedule of Debt Outstanding (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total debt $ 1,464,000 $ 1,200,000
Unamortized debt issuance costs (11,923) (9,545)
Current portion of long-term debt (5,000)  
Long-term debt, net of current portion 1,447,077 1,190,455
Senior Notes 4.625% Due 2023    
Debt Instrument [Line Items]    
Total debt 350,000 350,000
Unamortized debt issuance costs (4,500) (5,200)
Senior Notes 4.125% Due 2020    
Debt Instrument [Line Items]    
Total debt 325,000 325,000
Unamortized debt issuance costs (3,500) (4,300)
Senior Notes 5.0% Due 2022    
Debt Instrument [Line Items]    
Total debt 250,000  
Unamortized debt issuance costs (3,300)  
Revolving Credit Facility | $900.0 Million Revolving Credit Facility    
Debt Instrument [Line Items]    
Total debt 439,000 $ 525,000
Term Loan Due in July 2020    
Debt Instrument [Line Items]    
Total debt 100,000  
Unamortized debt issuance costs $ (600)