Long Term Debt - Schedule of Long-term Debt Obligations (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2021 Vessel		Dec. 31, 2020	[2]	Dec. 31, 2019
Debt Instrument [Line Items]
Number of vessels acquired	1	[1]	4		4
SEACOR Delta (f/k/a SEACOSCO) Shipyard Financing | SEACOSCO Offshore LLC
Debt Instrument [Line Items]
Number of vessels acquired	8

[1] Excludes five PSVs acquired as part of the OSV Partners Acquisition (see “Note 3. Business Acquisitions”).

[2] Excludes three CTVs as assets held for sale and seven PSVs acquired as part of the SEACOSCO Acquisition (see “Note 3. Business Acquisitions”).