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Long-Term Debt - Additional Information (Detail) - USD ($) | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Dec. 31, 2015 | Mar. 31, 2016 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014
Line of Credit Facility [Line Items] |  |  |  |  |  |
Finance receivables | $ 645,744,000 | $ 628,444,000 |  | $ 572,525,000 |  |
Allowance for credit losses | 36,200,000 | 37,452,000 | $ 36,230,000 | 36,171,000 | $ 36,950,000 | $ 40,511,000
Cash deposited to restricted cash reserve account | 8,237,000 | 10,506,000 |  |  |  |
Waterfall [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Cash deposited to restricted cash reserve account | 3,600,000 |  |  |  |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Finance receivables | 58,876,000 | 80,309,000 |  |  |  |
Allowance for credit losses | 2,677,000 | 2,588,000 |  |  |  |
Cash deposited to restricted cash reserve account | $ 5,335,000 | 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 | 84.00% |  |  |  |  |
Current percentage of advances on eligible unsecured finance receivables | 69.00% |  |  |  |  |
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 | $ 70,600,000 |  |  |  |  |
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 [Member] |  |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |  |
Finance receivables | $ 100,721,000 | $ 116,109,000 |  | 139,593,000 |  |
Allowance for credit losses | $ 7,851,000 | 8,828,000 | $ 8,028,000 | $ 11,121,000 | $ 11,833,000 | $ 11,776,000
Automobile [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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- Definition The standard percentage of eligible unsecured finance receivables that is available to be advanced from credit facility. + References No definition available. + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65884687&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=66008989&loc=d3e5074-111524 + Details
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