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, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Quarterly Financial Data [Abstract]                      
Operating Revenues $ 192,761 $ 200,658 $ 197,023 $ 209,524 $ 213,838 $ 220,257 $ 216,831 $ 184,824 $ 799,966 $ 835,750 $ 650,847
Operating Income 2,562 12,519 11,106 18,968 25,250 34,047 12,014 14,688 45,155 85,999 50,483
Net Income (loss) (1,912) 5,861 17,001 13,068 4,434 27,203 46,007 5,558 34,018 83,202 81,709
Net Income (Loss) attributable to SEACOR Holdings Inc. $ (1,917) $ 6,405 $ 14,553 $ 7,733 $ (4,686) $ 17,067 $ 45,126 $ 641 $ 26,774 $ 58,148 $ 61,643
Basic Earnings (Loss) Per Common Share of SEACOR Holdings Inc. (in dollars per share) $ (0.10) $ 0.33 $ 0.80 $ 0.42 $ (0.26) $ 0.94 $ 2.50 $ 0.04 $ 1.41 $ 3.22 $ 3.55
Diluted Earnings (Loss) Per Common Share of SEACOR Holdings Inc. (in dollars per share) $ (0.10) $ 0.32 $ 0.76 $ 0.41 $ (0.26) $ 0.88 $ 2.14 $ 0.04 $ 1.38 $ 3.04 $ 3.31