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Debt - Carrying Value of Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Total debt $ 808,230 $ 891,935
Less current portion of term credit facility 95,293 87,352
Total long-term debt 712,937 804,583
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 $ 508,230 547,935
Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Total debt   $ 44,000