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Equipment Held for Operating Lease - Narrative (Details) $ in Thousands | 12 Months Ended |  |
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Dec. 31, 2020 USD ($) regions | Dec. 31, 2020 engine | Dec. 31, 2020 aircraft. | Dec. 31, 2020 vessel | Dec. 31, 2019 USD ($) | Dec. 31, 2019 engine | Dec. 31, 2019 aircraft. | Dec. 31, 2019 marineVessel
Leases [Abstract] |  |  |  |  |  |  |  |
Net book value of equipment held for operating lease | $ 1,886,613 |  |  |  | $ 1,650,918 |  |  |
Net investment in lease, notes receivable | $ 158,700 |  |  |  | $ 38,100 |  |  |
Number of equipment pieces held for lease |  | 291 | 8 | 1 |  | 263 | 12 | 1
Number of geographic regions in which aircraft lessees are domiciled in | regions | 8 |  |  |  |  |  |  |

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- Definition Amount of net investment in sales-type and direct financing lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121561866&loc=SL77919306-209978 + Details
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