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Income Taxes - Additional Information (Detail) - USD ($) | 1 Months Ended | 4 Months Ended | 5 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 15, 2018
Income Tax [Line Items] |  |  |  |  |  |  |
Federal statutory tax rate |  |  |  |  | 21.00% | 35.00% |
Net deferred liabilities |  |  |  |  |  |  | $ 1,000,000.0
Cancellation of indebtedness (COD) income | $ 853,000,000.0 |  |  |  |  |  |
Total amount of reduction of tax attributes | 718,000,000.0 |  |  |  |  |  |
Net operating losses and depreciable assets | 358,000,000.0 |  |  |  |  |  |
Attribute reduction in stock of foreign subsidiaries | 330,000,000.0 |  |  |  |  |  |
Excess COD income attributed to subsidiaries | 122,000,000.0 |  |  |  |  |  |
Deferred tax recognized on excess COD income | 14,000,000.0 |  |  |  |  |  |
Annual limitation of company's ownership change |  |  |  | $ 15,000,000.0 |  |  |
Valuation allowance |  |  |  | 103,496,000 | $ 106,447,000 |  |
Undistributed earnings of foreign subsidiaries |  |  |  | 178,200,000 |  |  |
Income tax penalties and interest |  |  |  | 24,800,000 | 21,600,000 |  |
Unrecognized tax benefits, period increase (decrease) |  |  |  | (22,900,000) |  |  |
Unrecognized tax benefits that would affect the effective tax rate if recognized |  |  |  | 48,600,000 | 43,800,000 |  |
Reduction in net deferred tax asset |  |  |  |  |  | $ 15,100,000 |
Valuation allowance – deferred tax assets |  | $ 69,278,000 | $ (28,387,000) | 15,707,000 | 38,778,000 | $ 27,300,000 |
Global intangible low taxed income recognized |  |  |  | 0 | 0 |  |
Scenario Plan |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |
Federal statutory tax rate |  |  |  |  |  | 21.00% |
GulfMark |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |
Annual limitation of company's ownership change |  |  |  | $ 7,000,000.0 |  |  |
Tax credit carryforward prior to ownership change date expiration |  |  |  | 2032 |  |  |
Federal NOL |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | $ 300,000,000.0 | 218,100,000 |  |
Taxable income limitation with indefinite carryover |  |  |  | 80.00% |  |  |
Federal NOL | IRC Section 382 Limitation |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | $ 145,900,000 | $ 137,900,000 |  |
Foreign NOL |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |
Net operating loss carryforwards |  |  |  | 132,000,000.0 |  |  |
Tax credit |  |  |  | $ 500,000 |  |  |
Net operating loss carry forwards expiration period |  |  |  | 2025 |  |  |
Tax credit |  |  |  | $ 387,000,000 |  |  |
Domestic Subsidiaries |  |  |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |  |  |
Excess COD income attributed to subsidiaries | 136,000,000.0 |  |  |  |  |  |
Deferred tax recognized on excess COD income | $ 0 |  |  |  |  |  |

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