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Consolidated Statements of Equity - USD ($) $ in Thousands | Gulf Mark Offshore Inc [Member] Common Stock [Member] | Gulf Mark Offshore Inc [Member] Additional Paid-in Capital [Member] | Gulf Mark Offshore Inc [Member] Retained Earnings [Member] | Gulf Mark Offshore Inc [Member] AOCI Attributable to Parent [Member] | Gulf Mark Offshore Inc [Member] Noncontrolling Interest [Member] | Gulf Mark Offshore Inc [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] Noncontrolling Interest [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at December 31 at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  | $ 22 | $ 1,059,120 | $ (39,266) | $ (147) | $ 2,215 | $ 1,021,944
Total comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (171,517) | 2,341 | (254) | (169,430)
Issuance of common stock from exercise of warrants |  |  |  |  |  |  |  |  |  |  |  |  | 6 | (3) | 0 | 0 | 0 | 3
Issuance of common stock for GulfMark business combination | $ 9 | $ 285,483 | $ 0 | $ 0 | $ 0 | $ 285,492 |  |  |  |  |  |  |  |  |  |  |  |
Amortization of restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 8,914 | 0 | 0 | 0 | 8,914
Cash paid to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 | 0 | (874) | (2,000)
Cash paid to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,126) |  |  |  |
Balance at December 31 at Dec. 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  | 37 | 1,352,388 | (210,783) | 2,194 | 1,087 | 1,144,923
Total comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (143,649)
Issuance of common stock from exercise of warrants |  |  |  |  |  |  |  |  |  |  |  |  | 3 | (3) | 0 | 0 | 0 | 0
Amortization of restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 15,136 | 0 | 0 | 0 | 15,136
Total comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (141,743) | (2,430) | 524 | (143,649)
Balance at December 31 at Dec. 31, 2019 |  |  |  |  |  |  | $ 0 | $ 0 | $ (163) | $ 0 | $ 0 | $ (163) | 40 | 1,367,521 | (352,526) | (236) | 1,611 | 1,016,410
Total comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (197,264)
Issuance of common stock from exercise of warrants |  |  |  |  |  |  |  |  |  |  |  |  | 1 | (1) | 0 | 0 | 0 | 0
Amortization of restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 4,289 | 0 | 0 | 0 | 4,289
Total comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 0 | (196,242) | (568) | (454) | (197,264)
Balance at December 31 at Dec. 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  | $ 41 | $ 1,371,809 | $ (548,931) | $ (804) | $ 1,157 | $ 823,272

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