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Variable Interest Entities - Additional Information (Detail) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Oct. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2008
Variable Interest Entity [Line Items] |  |  |  |
Variable interest entity net gain | $ 25,325,000 |  |  |
Equity investments |  | $ 9,746,000 | $ 10,079,000 |
Medallion Financing Trust I [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Promissory note payable | $ 1,400,000 |  |  |
Taxi Medallion Loan Trust III [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Equity investments |  | 0 | $ 0 |
Taxi Medallion Loan Trust III [Member] | DZ Loan [Member] | Commercial Paper [Member] |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Line of credit facility maximum borrowing capacity |  |  |  | $ 200,000,000
Long-term debt |  | $ 86,825,000 |  |
Maturity date |  | May 15, 2021 |  |

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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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