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Long-Term Debt - Summary of the Company's Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term debt $ 481,766 $ 411,177
Unamortized debt issuance costs (2,403) (2,692)
Net long-term debt 479,363 408,485
Senior Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt 435,400 338,281
Unamortized debt issuance costs (1,242) (1,022)
Net long-term debt 434,158 337,259
Unused amount of senior revolving credit facility (subject to borrowing base) 149,600 199,719
Amortizing Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt 46,366 72,896
Unamortized debt issuance costs (1,161) (1,670)
Net long-term debt $ 45,205 $ 71,226