Unaudited Condensed Consolidated Statements of Income (Loss) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Operating Revenues	$ 59,973	$ 45,591
Costs and Expenses:
Operating	37,273	39,496
Administrative and general	11,632	9,924
Lease expense	720	1,060
Depreciation and amortization	13,762	14,371
Costs and expenses	63,387	64,851
Gains on asset dispositions and impairments, net	3,599	2,139
Operating Income (Loss)	185	(17,121)
Other Income (Expense):
Interest income	460	29
Interest expense	(8,788)	(6,627)
Derivative losses, net	0	(34)
Foreign currency (losses) gains, net	(825)	821
Nonoperating income expense	(9,153)	(5,811)
Loss Before Income Tax Expense (Benefit) and Equity in Earnings of 50% or Less Owned Companies	(8,968)	(22,932)
Income Tax Expense (Benefit)	1,157	(2,421)
Loss Before Equity in Earnings of 50% or Less Owned Companies	(10,125)	(20,511)
Equity in Earnings of 50% or Less Owned Companies	536	5,674
Net Loss attributable to SEACOR Marine Holdings Inc.	$ (9,589)	$ (14,837)
Net Earnings (Loss) Per Share:
Basic	$ (0.36)	$ (0.56)
Diluted	$ (0.36)	$ (0.56)
Weighted Average Common Stock and Warrants Outstanding:
Basic	26,822,391	26,379,293
Diluted	26,822,391	26,379,293