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Long-Term Debt - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 05, 2018 | Oct. 02, 2017 | Feb. 28, 2018 | Nov. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Cash deposited to restricted cash reserve account |  |  |  |  |  | $ 16,787,000 | $ 8,297,000 |
Revolving Warehouse Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Secured line of credit |  |  |  |  |  | 125,000,000 |  |
Line of credit facility, accordion feature |  |  |  |  |  | $ 150,000,000 |  |
Description of Variable Rate Basis |  |  |  |  |  | Borrowings under the facility bore interest, payable monthly, at a blended rate equal to three-month LIBOR, plus a margin of 3.50%. Effective October 2, 2017 and February 5, 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 three-month LIBOR was 1.69% at December 31, 2017. |  |
Percentage of advances on debt agreement eligible secured finance receivables |  |  |  |  |  | 80.00% |  |
Cash deposited to restricted cash reserve account |  |  |  |  |  | $ 800,000 |  |
Asset Backed Loans [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Amortizing loan, amount |  |  |  |  |  |  |  | $ 75,700,000
Loan, maturity date |  |  |  | 2024-12 |  |  |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Cash deposited to restricted cash reserve account |  |  |  |  |  | $ 10,734,000 | 4,426,000 |
Servicing fee |  |  |  |  |  | 4.00% |  |
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 |  |  |  |  |  | 83.00% |  |
Current percentage of advances on eligible unsecured finance receivables |  |  |  |  |  | 68.00% |  |
Credit facility, eligible borrowing capacity |  |  |  |  |  | $ 46,800,000 |  |
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 |  |  |  |  |  | 8,600,000 | $ 2,700,000 |
Credit Agreement [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Additional loan advance |  |  |  | $ 37,800,000 |  |  |  |
Credit Agreement [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Percentage of advances on debt agreement eligible secured finance receivables |  |  |  | 88.00% |  |  |  |
Cash deposited to restricted cash reserve account |  |  |  |  |  | $ 1,300,000 |  |
Credit agreement, Interest rate |  |  |  | 3.00% |  |  |  |
Terms related to loan prepayment |  |  |  |  |  | The amended and restated credit agreement allows RMR to prepay the loan when the outstanding balance falls below 20% of the original loan amount. |  |
Credit Agreement [Member] | Variable Interest Entity, Primary Beneficiary [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Percentage of advances on debt agreement eligible secured finance receivables |  |  | 85.00% |  |  |  |  |
Credit agreement, Interest rate |  |  | 3.25% |  |  |  |  |
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] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 1.56% | 0.77% |
London Interbank Offered Rate (LIBOR) [Member] | Revolving Warehouse Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate, basis spread |  |  |  |  |  | 3.50% |  |
Interest rate |  |  |  |  |  | 1.69% |  |
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 |  | 3.25% |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Milestones Associated with Conversion to New Loan Origination and Servicing System [Member] | Revolving Warehouse Credit Facility [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate, basis spread | 3.00% |  |  |  |  |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Senior Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Description of Variable Rate Basis |  |  |  |  |  | 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%. |  |
Interest rate, basis spread |  |  |  |  |  | 3.00% |  |
Interest rate |  |  |  |  |  | 1.63% | 0.88% |
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% |  |
Base Rate [Member] | Senior Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Description of Variable Rate Basis |  |  |  |  |  | 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%. |  |
Margin Rate [Member] | Senior Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate, basis spread |  |  |  |  |  | 2.00% |  |
Margin Rate [Member] | Senior Revolving Credit Facility [Member] | Availability Percentage Below 10% [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate, basis spread |  |  |  |  |  | 2.25% |  |
Prime Rate [Member] | Senior Revolving Credit Facility [Member] |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 4.50% | 3.75% |

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