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Long-Term Debt - Summary of the Company's Long-Term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Long-term debt $ 628,786 $ 660,507
Unamortized debt issuance costs (8,338) (9,158)
Net long-term debt 620,448 651,349
Unused amount of revolving credit facilities (subject to borrowing base) 433,440 406,600
Senior Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt 300,360 328,074
Unamortized debt issuance costs (1,574) (1,604)
Net long-term debt 298,786 326,470
Amortizing Loan [Member]    
Debt Instrument [Line Items]    
Long-term debt 16,877 21,642
Unamortized debt issuance costs (151) (201)
Net long-term debt 16,726 21,441
Revolving Warehouse Credit Facility [Member]    
Debt Instrument [Line Items]    
Long-term debt 30,954 30,126
Unamortized debt issuance costs (1,696) (1,899)
Net long-term debt 29,258 28,227
RMIT 2018-1 securitization [Member]    
Debt Instrument [Line Items]    
Long-term debt 150,246 150,246
Unamortized debt issuance costs (2,526) (2,849)
Net long-term debt 147,720 147,397
RMIT 2018-2 securitization [Member]    
Debt Instrument [Line Items]    
Long-term debt 130,349 130,419
Unamortized debt issuance costs (2,391) (2,605)
Net long-term debt $ 127,958 $ 127,814