Investments - Schedule of Financial Information (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Consolidated Statements of Income
Revenue		$ 119,083	$ 89,535
Expenses		91,865	81,537
Net income		20,869	4,394
Consolidated Balance Sheets
Total assets	[1]	2,674,462		$ 2,652,344
Total liabilities	[2]	2,162,689		2,163,417
Total WMES net equity		461,797	405,989	438,963	$ 404,688
WMES
Consolidated Statements of Income
Revenue		18,926	10,878
Expenses		13,762	11,165
Net income		5,164	$ (287)
Consolidated Balance Sheets
Total assets		241,784		236,732
Total liabilities		150,491		150,604
Total WMES net equity		$ 91,293		$ 86,128

[1] Total assets at March 31, 2024 and December 31, 2023, include the following assets of variable interest entities (“VIEs”) that can only be used to settle the liabilities of the VIEs: Restricted cash $86,620 and $160,958; Equipment $1,500,893 and $1,518,050; Maintenance Rights $7,806 and $7,806; Notes receivable $90,756 and $91,960; Investments in sales-type leases $28,143 and $3,564; and Other assets $14,444 and $13,339 (each respectively).

[2] Total liabilities at March 31, 2024 and December 31, 2023, include the following liabilities of VIEs for which the VIEs’ creditors do not have recourse to Willis Lease Finance Corporation: Debt obligations $1,386,738 and $1,411,680, respectively.