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Quarterly Financial Information (Unaudited) - Selected Financial Information for Interim Quarterly Periods (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]                      
Operating Revenues $ 36,044 $ 36,201 $ 33,925 $ 35,667 $ 42,478 $ 46,996 $ 45,014 $ 39,965 $ 141,837 $ 174,453 $ 179,161
Operating Loss (16,915) (13,179) (17,824) (23,721) (10,555) (5,566) (18,591) (19,616) (71,639) (54,328) (68,414)
Net (Loss) Income:                      
Continuing Operations (38,898) (19,842) (6,668) (17,938) (19,439) (12,586) (31,632) (27,307) (83,346) (90,964) (82,979)
Discontinued Operations 51 1,765 602 (2,054) (2,479) (5,654) 1,368 (966)      
Net Loss (38,847) (18,077) (6,066) (19,992) (21,918) (18,240) (30,264) (28,273) (82,982) (98,695) (82,052)
Net Loss attributable to SEACOR Marine Holdings Inc: $ (38,816) $ (18,081) $ (6,073) $ (15,945) $ (20,455) $ (18,444) $ (28,389) $ (25,549) $ (78,915) $ (92,837) $ (77,608)
Basic and Diluted (Loss) Income Per Common Share of SEACOR Marine Holdings Inc.                      
Continuing operations $ (1.54) $ (0.79) $ (0.26) $ (0.58) $ (0.76) $ (0.54) $ (1.27) $ (1.07) $ (3.20) $ (3.62) $ (3.74)
Discontinued operations   0.07 0.02 (0.08) (0.10) (0.24) 0.06 (0.04) 0.02 (0.33) 0.04
Basic and Diluted Income (Loss) Per Common Share and Warrants $ (1.54) $ (0.72) $ (0.24) $ (0.66) $ (0.86) $ (0.78) $ (1.21) $ (1.11) $ (3.18) $ (3.95) $ (3.70)