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Long-Term Debt and Capital Lease Obligations - Additional Information (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
6.0% Senior Notes Due 2022    
Debt Instrument [Line Items]    
Debt maturity period 2022 2022
Senior Bank Credit Facility    
Debt Instrument [Line Items]    
Credit facility $ 200,000 $ 200,000
Letters of Credit Outstanding, Amount $ 1,400