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Long-Term Debt - Additional Information (Detail) - USD ($) | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2016 | Sep. 30, 2015 | Jun. 30, 2015 | Dec. 31, 2014
Line of Credit Facility [Line Items] |  |  |  |  |  |
Finance receivables | $ 696,149,000 | $ 628,444,000 |  | $ 601,608,000 |  |
Allowance for credit losses | 39,100,000 | 37,452,000 | $ 36,200,000 | 37,786,000 | $ 36,171,000 | $ 40,511,000
Cash deposited to restricted cash reserve account | 7,906,000 | 10,506,000 |  |  |  |
Waterfall [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Cash deposited to restricted cash reserve account | 3,100,000 |  |  |  |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Finance receivables | 49,608,000 | 80,309,000 |  |  |  |
Allowance for credit losses | 2,976,000 | 2,588,000 |  |  |  |
Cash deposited to restricted cash reserve account | $ 4,786,000 | 7,605,000 |  |  |  |
Servicing fee | 4.00% |  |  |  |  |
Asset Backed Loans [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Amortizing loan, amount |  | $ 75,700,000 |  |  |  |
Amortizing loan, maturity date |  | 2022-12 |  |  |  |
Senior Revolving Credit Facility [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Current percentage of advances on eligible secured finance receivables | 85.00% |  |  |  |  |
Current percentage of advances on eligible unsecured finance receivables | 70.00% |  |  |  |  |
Percentage of advances on debt agreement eligible secured finance receivables | 85.00% |  |  |  |  |
Percentage of advances on debt agreement eligible unsecured finance receivables | 70.00% |  |  |  |  |
Credit facility, eligible capacity | $ 70,700,000 |  |  |  |  |
Credit Agreement [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Allowance for credit losses |  | $ 2,600,000 |  |  |  |
Cash deposited to restricted cash reserve account |  | $ 1,700,000 |  |  |  |
Credit agreement, Interest rate |  | 3.00% |  |  |  |
Terms related to loan prepayment | The credit agreement allows RMR to prepay the loan when the outstanding balance falls below 20% of the original loan amount. |  |  |  |  |
Automobile Loans [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Finance receivables | $ 97,141,000 | $ 116,109,000 |  | 128,131,000 |  |
Allowance for credit losses | $ 6,500,000 | 8,828,000 | $ 7,851,000 | $ 10,293,000 | $ 11,121,000 | $ 11,776,000
Automobile Loans [Member] | Credit Agreement [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Finance receivables |  | $ 86,100,000 |  |  |  |

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