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Long-Term Debt - Summary of the Company's Long-Term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term debt $ 571,496 $ 491,678
Unamortized debt issuance costs (4,950) (2,152)
Net long-term debt 566,546 489,526
Unused amount of revolving credit facilities (subject to borrowing base) 244,884 132,151
Senior Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt 452,050 452,849
Unamortized debt issuance costs (2,162) (1,221)
Net long-term debt 449,888 451,628
Amortizing Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt 53,380 38,829
Unamortized debt issuance costs (547) (931)
Net long-term debt 52,833 $ 37,898
Revolving Warehouse Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt 66,066  
Unamortized debt issuance costs (2,241)  
Net long-term debt $ 63,825