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Long-Term Debt - Additional Information (Detail) - USD ($) |  |  | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Feb. 05, 2018 | Oct. 02, 2017 | Feb. 28, 2018 | Nov. 30, 2017 | Jun. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Cash deposited to restricted cash reserve account |  |  |  |  | $ 10,630,000 | $ 26,356,000 | $ 16,787,000 | $ 8,297,000 |
Private offering of investment grade asset-backed notes |  |  |  |  |  | 150,000,000 |  |  |
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 |  |  |  |  |
Credit agreement, Interest rate |  |  | 3.25% |  |  |  |  |  |
Debt maturity date |  |  |  | 2024-12 |  |  |  |  |
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 |  |  |  |  |  | $ 150,000,000 |  |  |
Percentage of advances on debt agreement eligible secured finance receivables |  |  |  |  |  | 80.00% |  |  |
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%. 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 three-month LIBOR was 2.34% and 1.69% at June 30, 2018 and December 31, 2017, respectively. |  |  |
Cash deposited to restricted cash reserve account |  |  |  |  |  | $ 400,000 |  |  |
Debt maturity date |  |  |  |  |  | 2019-12 |  |  |
Debt revolving period end date |  |  |  |  |  | 2018-12 |  |  |
Revolving Warehouse Credit Facility Prior to May 2018 [Member] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Secured line of credit |  |  |  |  |  | $ 125,000,000 |  |  |
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% |  |  |
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 |  |  |  |  |  | 82.00% |  |  |
Current percentage of advances on eligible unsecured finance receivables |  |  |  |  |  | 67.00% |  |  |
Credit facility, eligible borrowing capacity |  |  |  |  |  | $ 67,100,000 |  |  |
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 2.09% and 1.56% at June 30, 2018 and December 31, 2017, 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 5.00% and 4.50% at June 30, 2018 and December 31, 2017, respectively. |  |  |
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 |  |  |  |  |  | $ 16,400,000 | $ 8,600,000 |  |
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] |  |  |  |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |  |  |  |
Interest rate |  |  |  |  |  | 2.09% | 1.56% |  |
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 |  |  |  |  |  | 2.34% | 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 | 3.00% | 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 |  |  |  |  |  | 2.09% | 1.56% |  |
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 |  |  |  |  |  | 5.00% | 4.50% |  |
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% |  |  |

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