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Long-Term Debt - Summary of the Company's Long-Term Debt (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt $ 689,310 $ 660,507
Unamortized debt issuance costs (7,357) (9,158)
Net long-term debt 681,953 651,349
Unused amount of revolving credit facilities (subject to borrowing base) 368,456 406,600
Senior Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt 345,590 328,074
Unamortized debt issuance costs (1,413) (1,604)
Net long-term debt 344,177 326,470
Amortizing Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt 12,251 21,642
Unamortized debt issuance costs (113) (201)
Net long-term debt 12,138 21,441
Revolving Warehouse Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt 50,874 30,126
Unamortized debt issuance costs (1,474) (1,899)
Net long-term debt 49,400 28,227
RMIT 2018-1 securitization [Member]    
Debt Instrument [Line Items]    
Long-term debt 150,246 150,246
Unamortized debt issuance costs (2,203) (2,849)
Net long-term debt 148,043 147,397
RMIT 2018-2 securitization [Member]    
Debt Instrument [Line Items]    
Long-term debt 130,349 130,419
Unamortized debt issuance costs (2,154) (2,605)
Net long-term debt $ 128,195 $ 127,814