Investments - Schedule of Financial Information (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Consolidated Statements of Income
Revenue		$ 108,996	$ 78,075	$ 198,531	$ 146,892
Expenses		89,554	68,590	171,091	162,512
WMES net (loss) income		13,816	5,908	18,210	(15,293)
Consolidated Balance Sheets
Total assets	[1]	2,603,956		2,603,956			$ 2,575,217
Total liabilities	[2]	2,136,858		2,136,858			2,120,640
Total WMES net equity		417,167	374,894	417,167	374,894	$ 405,989	404,688	$ 371,007	$ 375,885
WMES
Consolidated Statements of Income
Revenue		10,972	21,185	21,850	30,726
Expenses		11,387	17,687	22,552	32,690
WMES net (loss) income		(415)	$ 3,498	(702)	$ (1,964)
Consolidated Balance Sheets
Total assets		245,027		245,027			267,580
Total liabilities		160,901		160,901			183,083
Total WMES net equity		$ 84,126		$ 84,126			$ 84,497

[1] Total assets at June 30, 2023 and December 31, 2022, include the following assets of variable interest entities (“VIEs”) that can only be used to settle the liabilities of the VIEs: Restricted cash $49,094 and $76,870; Equipment $1,179,739 and $1,167,970; Maintenance Rights $6,822 and $5,433; Notes receivable $78,796 and $80,220; and Other assets $6,902 and $6,470 (each respectively).

[2] Total liabilities at June 30, 2023 and December 31, 2022, include the following liabilities of VIEs for which the VIEs’ creditors do not have recourse to Willis Lease Finance Corporation: Debt obligations $1,067,881 and $1,118,721, respectively.