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Long-Term Debt - Summary of the Company's Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term debt $ 441,147 $ 411,177
Unamortized debt issuance costs (2,285) (2,692)
Net long-term debt 438,862 408,485
Senior Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt 386,591 338,281
Unamortized debt issuance costs (851) (1,022)
Net long-term debt 385,740 337,259
Unused amount of senior revolving credit facility (subject to borrowing base) 151,409 199,719
Amortizing Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt 54,556 72,896
Unamortized debt issuance costs (1,434) (1,670)
Net long-term debt $ 53,122 $ 71,226