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Leases - Net Investment in Finance Leases (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Concentration Risk [Line Items]
Future minimum lease payment receivable	$ 1,380,331	$ 355,755
Estimated residual receivable	146,428	53,892
Gross finance lease receivables	1,526,759	409,647
Unearned income	(510,461)	(127,516)
Net investment in finance leases	$ 1,016,298	$ 282,131
Customer One | Customer Concentration Risk | Lease Finance Portfolio Benchmark
Concentration Risk [Line Items]
Concentration risk, percentage	89.00%	75.00%

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Amount of remaining payments as of the balance sheet date that lessees are obligated to make or can be required to make under direct financing and sales-type leases, net of allowance for uncollectible minimum lease payments.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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