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Schedule of Debt Outstanding (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Total debt $ 1,417,750 $ 1,464,000
Unamortized debt issuance costs (11,372) (11,923)
Current portion of long-term debt (6,250) (5,000)
Long-term debt, net of current portion 1,400,128 1,447,077
Term Loan Due in July 2020    
Debt Instrument [Line Items]    
Total debt 98,750 100,000
Unamortized debt issuance costs (500) (600)
Senior Notes 4.625% Due 2023    
Debt Instrument [Line Items]    
Total debt 350,000 350,000
Unamortized debt issuance costs (4,400) (4,500)
Senior Notes 4.125% Due 2020    
Debt Instrument [Line Items]    
Total debt 325,000 325,000
Unamortized debt issuance costs (3,300) (3,500)
Senior Notes 5.0% Due 2022    
Debt Instrument [Line Items]    
Total debt 250,000 250,000
Unamortized debt issuance costs (3,200) (3,300)
Revolving Credit Facility | $900.0 Million Revolving Credit Facility    
Debt Instrument [Line Items]    
Total debt $ 394,000 $ 439,000