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Debt - Carrying Value of Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Debt issuance costs $ (12,979) $ (9,372)
Total debt 696,834 743,918
Current portion of long-term debt 17,701 90,323
Less current portion of debt issuance costs (3,049) (4,970)
Total long-term debt 679,133 653,595
6.375% Senior Notes, due August 2020 [Member]    
Debt Instrument [Line Items]    
Total debt 300,000 300,000
Term Credit Facility [Member]    
Debt Instrument [Line Items]    
Total debt 409,813 365,290
Current portion of long-term debt $ 20,750 95,293
Revolving Credit Facility    
Debt Instrument [Line Items]    
Total debt   $ 88,000