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Debt - Carrying Value of Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Debt issuance costs $ (13,203) $ (10,521)
Total debt 671,756 685,729
Current portion of long-term debt 20,767 17,786
Less current portion of debt issuance costs (2,980) (2,964)
Total long-term debt 650,989 667,943
5.75% Senior Notes, due August 2026 [Member]    
Debt Instrument [Line Items]    
Total debt 400,000  
6.375% Senior Notes, due August 2020 [Member]    
Debt Instrument [Line Items]    
Total debt   300,000
Term Credit Facility [Member]    
Debt Instrument [Line Items]    
Total debt 284,959 394,250
Current portion of long-term debt $ 23,747 20,750
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Total debt   $ 2,000