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Long-Term Debt - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended
Feb. 05, 2018
Oct. 02, 2017
Aug. 31, 2018
Feb. 28, 2018
Nov. 30, 2017
Jun. 30, 2017
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2015
Line of Credit Facility [Line Items]                      
Cash deposited to restricted cash reserve account             $ 38,917,000 $ 46,484,000 $ 19,064,000 $ 16,787,000  
Amortizing Loan [Member]                      
Line of Credit Facility [Line Items]                      
Percentage of advances on debt agreement eligible secured finance receivables       85.00%              
Cash deposited to restricted cash reserve account             $ 1,300,000        
Amortizing loan, amount                     $ 75,700,000
Additional loan advance         $ 37,800,000            
Debt maturity date         2024-12            
Credit agreement, Interest rate       3.25%              
Terms related to loan prepayment             The credit agreement allows the Company to prepay the loan when the outstanding balance falls below 20% of the original loan amount.        
Principal balance percentage threshold for allowable prepayment of loan             20.00%        
Amortizing Loan Prior to February 2018 [Member]                      
Line of Credit Facility [Line Items]                      
Percentage of advances on debt agreement eligible secured finance receivables         88.00%            
Credit agreement, Interest rate         3.00%            
Revolving Warehouse Credit Facility [Member]                      
Line of Credit Facility [Line Items]                      
Secured line of credit             $ 125,000,000        
Debt agreement expiration date             Feb. 29, 2020        
Line of credit facility, accordion feature             $ 150,000,000        
Percentage of advances on debt agreement eligible secured finance receivables             80.00%        
Description of Variable Rate Basis             Borrowings under the facility previously bore interest, payable monthly, at a blended rate equal to three-month LIBOR, plus a margin of 3.50%. In October 2017 and February 2018, the margin decreased to 3.25% and 3.00%, respectively, following the satisfaction of milestones associated with the Company’s conversion to a new loan origination and servicing system. The August 2018 amendment to the credit agreement further decreased the margin to 2.20%. The three-month LIBOR was 2.60% and 2.81% at March 31, 2019 and December 31, 2018, respectively.        
Cash deposited to restricted cash reserve account             $ 400,000        
Debt maturity date             2021-02        
Debt revolving period end date             2020-02        
Revolving Warehouse Credit Facility Between May and August 2018 [Member]                      
Line of Credit Facility [Line Items]                      
Secured line of credit             $ 150,000,000        
Revolving Warehouse Credit Facility Prior to May 2018 [Member]                      
Line of Credit Facility [Line Items]                      
Debt agreement expiration date             Feb. 28, 2021        
RMIT 2018-1 securitization [Member]                      
Line of Credit Facility [Line Items]                      
Cash deposited to restricted cash reserve account             $ 1,700,000        
Debt maturity date             2027-07        
Terms related to loan prepayment             Prior to maturity in July 2027, the Company may redeem the notes in full, but not in part, at its option on any note payment date on or after the payment date occurring in July 2020. No payments of principal of the notes will be made during the revolving period.        
Debt revolving period end date             2020-06        
Private offering of investment grade asset-backed notes             $ 150,000,000        
Weighted average rate             3.93%        
RMIT 2018-2 securitization [Member]                      
Line of Credit Facility [Line Items]                      
Cash deposited to restricted cash reserve account             $ 1,400,000        
Debt maturity date             2028-01        
Terms related to loan prepayment             Prior to maturity in January 2028, the Company may redeem the notes in full, but not in part, at its option on any note payment date on or after the payment date occurring in January 2021. No payments of principal of the notes will be made during the revolving period.        
Debt revolving period end date             2020-12        
Private offering of investment grade asset-backed notes             $ 130,000,000        
Weighted average rate             4.87%        
Senior Revolving Credit Facility [Member]                      
Line of Credit Facility [Line Items]                      
Secured line of credit           $ 638,000,000          
Debt agreement expiration date           Jun. 20, 2020          
Line of credit facility, accordion feature           $ 700,000,000          
Unused line fee per annum             0.50%        
Decreased unused line fee             0.375%        
Percentage of advances on debt agreement eligible secured finance receivables             85.00%        
Percentage of advances on debt agreement eligible unsecured finance receivables             70.00%        
Current percentage of advances on eligible secured finance receivables             77.00%        
Current percentage of advances on eligible unsecured finance receivables             62.00%        
Credit facility, eligible borrowing capacity             $ 59,600,000        
Description of Variable Rate Basis             Borrowings under the facility bear interest, payable monthly, at rates equal to LIBOR of a maturity the Company elects between one and six months, with a LIBOR floor of 1.00%, plus a 3.00% margin, increasing to 3.25% when the availability percentage is below 10%. The one-month LIBOR rate was 2.49% and 2.50% at March 31, 2019 and December 31, 2018, respectively. Alternatively, the Company may pay interest at the prime rate, plus a 2.00% margin, increasing to 2.25% when the availability percentage is below 10%. The prime rate was 5.50% at both March 31, 2019 and December 31, 2018.        
Senior Revolving Credit Facility [Member] | Senior Revolving Credit Facility Prior to June 20, 2017 [Member]                      
Line of Credit Facility [Line Items]                      
Secured line of credit           $ 585,000,000          
Debt agreement expiration date           Aug. 31, 2019          
Waterfall [Member]                      
Line of Credit Facility [Line Items]                      
Cash deposited to restricted cash reserve account             $ 26,800,000 $ 33,500,000      
Minimum [Member] | Revolving Warehouse Credit Facility [Member]                      
Line of Credit Facility [Line Items]                      
Unused line fee per annum             0.35%        
Minimum [Member] | Senior Revolving Credit Facility [Member]                      
Line of Credit Facility [Line Items]                      
Average outstanding amount             $ 413,000,000        
Maximum [Member] | Revolving Warehouse Credit Facility [Member]                      
Line of Credit Facility [Line Items]                      
Unused line fee per annum             0.85%        
London Interbank Offered Rate (LIBOR) [Member] | Revolving Warehouse Credit Facility [Member]                      
Line of Credit Facility [Line Items]                      
Interest rate, basis spread     2.20%       3.50%        
Interest rate             2.60% 2.81%      
London Interbank Offered Rate (LIBOR) [Member] | Milestones Associated with Conversion to New Loan Origination and Servicing System [Member] | Revolving Warehouse Credit Facility [Member]                      
Line of Credit Facility [Line Items]                      
Interest rate, basis spread 3.00% 3.25%                  
London Interbank Offered Rate (LIBOR) [Member] | Senior Revolving Credit Facility [Member]                      
Line of Credit Facility [Line Items]                      
Interest rate, basis spread             3.00%        
Interest rate             2.49% 2.50%      
London Interbank Offered Rate (LIBOR) [Member] | Senior Revolving Credit Facility [Member] | Availability Percentage Below 10% [Member]                      
Line of Credit Facility [Line Items]                      
Interest rate, basis spread             3.25%        
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Senior Revolving Credit Facility [Member]                      
Line of Credit Facility [Line Items]                      
Effective interest rate on line of credit             1.00%        
Prime Rate [Member] | Senior Revolving Credit Facility [Member]                      
Line of Credit Facility [Line Items]                      
Interest rate, basis spread             2.00%        
Interest rate             5.50% 5.50%      
Prime Rate [Member] | Senior Revolving Credit Facility [Member] | Availability Percentage Below 10% [Member]                      
Line of Credit Facility [Line Items]                      
Interest rate, basis spread             2.25%