Annual report pursuant to Section 13 and 15(d)

Quarterly Financial Information (Unaudited) (Details)

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Quarterly Financial Information (Unaudited) (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 Data [Abstract]                      
Operating Revenues $ 213,531 $ 175,414 $ 172,585 $ 192,296 $ 192,761 $ 200,658 $ 197,023 $ 209,524 $ 753,826 $ 799,966 $ 835,750
Operating Income (Loss) 13,317 5,620 13,816 (98) 2,562 12,519 11,106 18,968 32,655 45,155 85,999
Net Income (Loss) 10,798 3,189 7,875 1,469 (1,912) 5,861 17,001 13,068 23,331 34,018 83,202
Net Income (Loss) attributable to SEACOR Holdings Inc. $ 10,770 $ 3,190 $ 7,884 $ 1,467 $ (1,917) $ 6,405 $ 14,553 $ 7,733 $ 23,311 $ 26,774 $ 58,148
Basic Earnings Per Common Share of SEACOR Holdings Inc. (in dollars per share) $ 0.54 $ 0.16 $ 0.39 $ 0.07 $ (0.10) $ 0.33 $ 0.80 $ 0.42 $ 1.17 $ 1.41 $ 3.22
Diluted Earnings Per Common Share of SEACOR Holdings Inc. (in dollars per share) $ 0.52 $ 0.16 $ 0.39 $ 0.07 $ (0.10) $ 0.32 $ 0.76 $ 0.41 $ 1.16 $ 1.38 $ 3.04