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Debt - Summary of the Company's Debt (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Debt | $ 978,803 | $ 768,909
Unamortized debt issuance costs | (10,110) | (6,661)
Net long-term debt | 968,693 | 762,248
Unused amount of revolving credit facilities (subject to borrowing base) | 721,632 | 438,082
Senior Revolving Credit Facility |  |
Debt Instrument [Line Items] |  |
Debt | 130,985 | 286,113
Unamortized debt issuance costs | (1,003) | (1,687)
Net long-term debt | 129,982 | 284,426
RMR II revolving warehouse credit facility |  |
Debt Instrument [Line Items] |  |
Debt | 23,060 | 42,061
Unamortized debt issuance costs | (1,547) | (1,486)
Net long-term debt | 21,513 | 40,575
RMR IV revolving warehouse credit facility |  |
Debt Instrument [Line Items] |  |
Debt | 23,613 |
Unamortized debt issuance costs | (588) |
Net long-term debt | 23,025 |
RMR V revolving warehouse credit facility |  |
Debt Instrument [Line Items] |  |
Debt | 41,651 |
Unamortized debt issuance costs | (571) |
Net long-term debt | 41,080 |
RMIT 2018-2 securitization |  |
Debt Instrument [Line Items] |  |
Debt |  | 130,349
Net long-term debt |  | 130,349
RMIT 2019-1 securitization |  |
Debt Instrument [Line Items] |  |
Debt | 130,172 | 130,172
Unamortized debt issuance costs | (643) | (1,216)
Net long-term debt | 129,529 | 128,956
RMIT 2020-1 securitization |  |
Debt Instrument [Line Items] |  |
Debt | 180,214 | 180,214
Unamortized debt issuance costs | (1,648) | (2,272)
Net long-term debt | 178,566 | $ 177,942
RMIT 2021-1 securitization |  |
Debt Instrument [Line Items] |  |
Debt | 248,916 |
Unamortized debt issuance costs | (2,041) |
Net long-term debt | 246,875 |
RMIT 2021-2 securitization |  |
Debt Instrument [Line Items] |  |
Debt | 200,192 |
Unamortized debt issuance costs | (2,069) |
Net long-term debt | $ 198,123 |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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