Related Party Transactions - Additional Information (Details) $ / shares in Units, € in Millions, £ in Millions																					1 Months Ended				12 Months Ended
		Dec. 23, 2021 shares	Oct. 29, 2021 USD ($)	Jul. 23, 2021 USD ($)	Jun. 01, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 18, 2020 shares	Sep. 01, 2020 shares	Jun. 26, 2020 USD ($)	Jun. 14, 2019 shares	Jun. 08, 2019 shares	May 28, 2019 shares	Mar. 15, 2019 USD ($) shares	Mar. 15, 2019 EUR (€) shares	Jan. 25, 2019 USD ($)	Jan. 25, 2019 GBP (£)	Jan. 09, 2019 shares	Dec. 20, 2018 USD ($)	May 02, 2018 USD ($) $ / shares shares	Dec. 01, 2015 USD ($)	Dec. 31, 2021 USD ($) Vessel shares	Apr. 30, 2021 USD ($)	Jul. 31, 2020 USD ($)	Apr. 30, 2018 USD ($) $ / shares shares	Dec. 31, 2021 USD ($) Vessel shares	Dec. 31, 2020 USD ($) shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 30, 2021 USD ($)	Jan. 12, 2021	Dec. 28, 2018
Related Party Transaction [Line Items]
Related party transactions,minimum amount of transaction for review and approval																									$ 120,000
Guarantor obligations, maximum exposure																					$ 0				$ 0
Related party transaction, rate																									0.50%
Interest expense, related party																										$ 100,000	$ 200,000
Proceeds from cash tax refunds																										$ 1,600,000
Investments				$ 2,600,000
Equity method investment, ownership percentage				50.00%	50.00%													49.00%
Vessel management fees																												$ 600,000	$ 600,000
Class of warrant or right, outstanding | shares																					1,439,483				1,439,483	1,488,292	1,826,966
Issuance of common stock																											$ 6,596,000
Class of warrant or right, exercised during period | shares		48,809					83,367	255,307		64,440	64,440	380,000
Indebtedness																		$ 95,000,000.0
Total purchase price					$ 30,200,000
Gain (loss) on equity earnings					$ 2,600,000
Distribution Received				$ 12,000,000.0
Excess of distribution received				$ 9,400,000
Revenues																									$ 170,941,000	$ 141,837,000	174,453,000
CME
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																					49.00%				49.00%
SEACOR Marlin LLC
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																					49.00%				49.00%
Distribution Received																									$ 2,500,000
OVH
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																					49.00%				49.00%
O P E M
Related Party Transaction [Line Items]
Loan in exchange																					$ 10,000,000.0				$ 10,000,000.0
Loan early repayment																					10,500,000				10,500,000
Interest payable																					$ 4,100,000				$ 4,100,000
Private Placement
Related Party Transaction [Line Items]
Issuance of Common Stock (in shares) | shares																	603,872							750,000
Issuance of common stock																								$ 15,000,000.0
Warrants Issued In Private Placement
Related Party Transaction [Line Items]
Class of warrant or right, exercise price of warrants or rights | $ / shares																								$ 0.01
Class of warrant or right, outstanding | shares																								2,168,586
Class of warrant or right, number of securities called by warrants or rights | shares																								674,164
Convertible Senior Notes 3.75%
Related Party Transaction [Line Items]
Convertible debt, total																			$ 125,000,000.0	$ 175,000,000.0				$ 125,000,000.0
Debt instrument, convertible, conversion ratio																				23.26
Debt instrument, face amount																				$ 1,000
Debt instrument, interest rate																			4.25%	3.75%	3.75%			4.25%	3.75%
Lender Non Recourse
Related Party Transaction [Line Items]
Indebtedness																		70,000,000.0
Talos Energy, Inc
Related Party Transaction [Line Items]
Revenues																									$ 1,900,000	$ 1,500,000	$ 3,200,000
Carlyle Group
Related Party Transaction [Line Items]
Convertible debt, total																				$ 175,000,000.0
Interest rate term																										Interest on the Convertible Notes is payable semi-annually on June 15 and December 15 of each year, commencing June 15, 2016
Debt instrument, convertible, terms of conversion feature																									Carlyle has not exercised this right subsequent to Mr. Hussein’s resignation but retains the right to appoint a member to the Board of Directors. Mr. Hussein has been designated by Carlyle to observe meetings of the Board of Directors pursuant to Carlyle’s observer rights under the Convertible Notes. This observation right will terminate at the time Carlyle owns less than $50.0 million in aggregate principal amount of the Convertible Notes or a combination of the Convertible Notes and our Common Stock representing less than 5.0% of the Company’s Common Stock outstanding on a fully diluted basis, assuming the conversion of all of the Convertible Notes and Warrants to purchase Common Stock held by Carlyle.
Class of warrant or right, outstanding | shares																					1,439,483				1,439,483
Class of warrant or right, exercised during period | shares																									48,809	83,367
Carlyle Group | Convertible Senior Notes Converted to Warrants
Related Party Transaction [Line Items]
Debt conversion, original debt, amount																			$ 50,000,000					$ 50,000,000.0
Class of warrant or right, exercise price of warrants or rights | $ / shares																			$ 0.01					$ 0.01
Debt instrument, convertible, conversion ratio																			37.73					37.73
Debt instrument, face amount																			$ 1,000					$ 1,000
Debt instrument, convertible, conversion price | $ / shares																			$ 26.50					$ 26.50
Debt conversion, converted instrument, shares issued | shares																			1,886,792					1,900,000
OSV Partners
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	[1]																				30.40%				30.40%
OSV Partners | Limited Partner
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																					29.70%				29.70%
CME
Related Party Transaction [Line Items]
Class of warrant or right, exercised during period | shares																										255,307	380,000
Contributed capital																		5,000,000.0
MexMar
Related Party Transaction [Line Items]
Transaction fee																									$ 200,000
Equity method investment, ownership percentage																					49.00%				49.00%
Number of vessels owned | Vessel																					16				16
Indebtedness																		15,000,000.0
Percentage transferred																									49.00%
MEXMAR Offshore
Related Party Transaction [Line Items]
Equity method investment, ownership percentage	[2]																				49.00%				49.00%
Indebtedness																		10,000,000.0
Contributed capital																		$ 5,000,000.0
MEXMAR Offshore | BRAZIL
Related Party Transaction [Line Items]
Aggregate purchase price																											$ 0
Long-term debt, total																							$ 70,000,000.0
Commitment to fund purchase																							2,700,000
Loaned commitment amount																										$ 1,960,000
Exchange | O S V Credit Facility
Related Party Transaction [Line Items]
Loan acquired			$ 2,200,000
Third Party Lender | O S V Credit Facility
Related Party Transaction [Line Items]
Loan acquired			4,100,000
Principal | O S V Credit Facility
Related Party Transaction [Line Items]
Loan acquired			$ 22,100,000
Merger Agreement | OSV Partners | Limited Partner
Related Party Transaction [Line Items]
Business combination, assumed and guarantee amount																					$ 18,100,000
Quarterly principal payments																					$ 500,000
Percentage of interest accrues under credit facility plus mandatory cost																					4.68%
Debt instrument, maturity date																					Dec. 31, 2023
Merger Agreement | OSV Partners | Limited Partner | Platform Supply Vessels
Related Party Transaction [Line Items]
Number of vessels owned | Vessel																					5				5
Percentage of voting interests acquired																					100.00%				100.00%
Average age of vessels																					7 years
Merger Agreement | OSV Partners | Limited Partner | Common Stock [Member]
Related Party Transaction [Line Items]
Common stock issued | shares																									1,567,935
Merger Agreement | OSV Partners | Limited Partner | Common Stock [Member] | Caroline
Related Party Transaction [Line Items]
Common stock issued | shares																									73,107
Merger Agreement | OSV Partners | Limited Partner | Common Stock [Member] | Caroline I I
Related Party Transaction [Line Items]
Common stock issued | shares																									36,570
Windcat Workboats Facilities | Seabulk Overseas
Related Party Transaction [Line Items]
Common stock issued | shares													50,000	50,000
Percentage of voting interests acquired													6.25%	6.25%	6.25%	6.25%					100.00%				100.00%
Ownership Percentage															100.00%	100.00%
Business combination, consideration transferred, total													$ 1,400,000	€ 1.2	$ 2,000,000.0	£ 1.6
Windcat Workboats Facilities | CMB N.V.
Related Party Transaction [Line Items]
Percentage sale of equity																															100.00%
UP Offshore | MEXMAR Offshore | BRAZIL
Related Party Transaction [Line Items]
Long-term debt, total																							$ 5,500,000
OSV Partners
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners																														30.40%
Mexmar Offshore International
Related Party Transaction [Line Items]
Equity method investment, ownership percentage					49.00%
Noncontrolling interest, ownership percentage by noncontrolling owners					51.00%													51.00%
Subsidiaries of CME
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners																					51.00%				51.00%
Subsidiaries of CME | CME
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners																					51.00%				51.00%
Subsidiaries of CME | OVH
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners																					51.00%				51.00%
Subsidiary of MexMar | SEACOR Marlin LLC
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners																					51.00%				51.00%
Offshore Vessel Holdings
Related Party Transaction [Line Items]
Noncontrolling Interest, ownership percentage by parent																																49.00%
Noncontrolling interest, ownership percentage by noncontrolling owners																																51.00%
Contributed capital																											10,000,000.0
Financing agreement																											2,400,000
Mr. Fabrikant
Related Party Transaction [Line Items]
Investments																														$ 300,000
Gellert
Related Party Transaction [Line Items]
Investments																														400,000
Llorca
Related Party Transaction [Line Items]
Investments																														$ 200,000
Maximum
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																					50.00%				50.00%	50.00%
Ownership Percentage																					50.00%				50.00%
Maximum | Carlyle Group
Related Party Transaction [Line Items]
Convertible debt, total																													$ 50,000,000.0
Percentage of convertible notes converted into common stock																													5.00%
Minimum
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																					20.00%				20.00%
Minimum | Carlyle Group
Related Party Transaction [Line Items]
Percentage of convertible notes converted into common stock																				10.00%
Transition Services Agreement
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction																									$ 0	$ 0	600,000
Transition Services Agreement | Maximum
Related Party Transaction [Line Items]
Related Party Transaction, Amounts of Transaction																											6,300,000
Caroline
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																					2.60%				2.60%
Equity Method Investment, Ownership Amount																									$ 1,000,000.0
Caroline I I
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																					1.30%				1.30%
Equity Method Investment, Ownership Amount																									$ 500,000
OSV Partners I
Related Party Transaction [Line Items]
Proceeds from Sale of Interest in Partnership Unit																												10,000,000.0
Class A Preferred Interests
Related Party Transaction [Line Items]
Proceeds from issuance of debt																												5,000,000.0
Second Lien Debt
Related Party Transaction [Line Items]
Proceeds from Issuance of Redeemable Preferred Stock																												$ 5,000,000.0
Class A Preferred Interests Caroline
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																												2.60%
Limited Partners' Capital Account																												$ 100,000
P I K Loan Debt And Caroline
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																												2.60%
Limited Partners' Capital Account																												$ 100,000
Class A Preferred Interests Caroline II
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																												1.30%
Limited Partners' Capital Account																												$ 100,000
P I K Loan Debt And Caroline II
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																												1.30%
Limited Partners' Capital Account																												$ 100,000
Tax Refund Agreement
Related Party Transaction [Line Items]
Proceeds from cash tax refunds									$ 32,300,000
Percentage of net operating losses facilitate tax savings									35.00%
Interest received on cash refunds									$ 1,100,000
Transaction fee									3,000,000.0
Cash tax refunds without restrict to use									$ 23,100,000																23,100,000
Cash tax refunds with restrict to use																									$ 8,100,000
Tax refunds restricted cash																										7,000,000.0
Merger Consideration | Merger Agreement | Common Stock [Member]
Related Party Transaction [Line Items]
Common stock issued | shares																					1,567,935
Merger Consideration | Merger Agreement | OSV Partners | Common Stock [Member]
Related Party Transaction [Line Items]
Common stock issued | shares																					531,872				1,567,935
Merger Consideration | Merger Agreement | OSV Partners I | Preferred Interests and Class A Preferred Interests
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																					80.00%				80.00%
Merger Consideration | Merger Agreement | OSV Partners I | Common Stock [Member]
Related Party Transaction [Line Items]
Common stock issued | shares																									531,872
Merger Consideration | Merger Agreement | OSV Partners I | Limited Partner
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																					20.00%				20.00%
PIK Loan Consideration | Merger Agreement | OSV Partners | Limited Partner | Common Stock [Member]
Related Party Transaction [Line Items]
Common stock issued | shares																					1,036,063
PIK Loan Consideration | Merger Agreement | OSV Partners I | Limited Partner | Common Stock [Member]
Related Party Transaction [Line Items]
Common stock issued | shares																									1,036,063
Merger Consideration And Payment In Kind Loan Consideration | Merger Agreement | OSV Partners | Limited Partner | Common Stock [Member] | Caroline
Related Party Transaction [Line Items]
Common stock issued | shares																									26,557
Merger Consideration And Payment In Kind Loan Consideration | Mr. Fabrikant | Merger Agreement | OSV Partners | Limited Partner | Caroline
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																					1.30%				1.30%
Merger Consideration And Payment In Kind Loan Consideration | Mr. Fabrikant | Merger Agreement | OSV Partners | Limited Partner | Common Stock [Member] | Caroline
Related Party Transaction [Line Items]
Common stock issued | shares																									20,172
Merger Consideration And Payment In Kind Loan Consideration | Gellert | Merger Agreement | OSV Partners | Limited Partner | Caroline
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																					1.40%				1.40%
Merger Consideration And Payment In Kind Loan Consideration | Gellert | Merger Agreement | OSV Partners | Limited Partner | Common Stock [Member] | Caroline
Related Party Transaction [Line Items]
Common stock issued | shares																									22,353
Merger Consideration And Payment In Kind Loan Consideration | Llorca | Merger Agreement | OSV Partners | Limited Partner | Caroline
Related Party Transaction [Line Items]
Equity method investment, ownership percentage																					0.60%				0.60%
Merger Consideration And Payment In Kind Loan Consideration | Llorca | Merger Agreement | OSV Partners | Limited Partner | Common Stock [Member] | Caroline
Related Party Transaction [Line Items]
Common stock issued | shares																									9,174
SEACOR Holdings
Related Party Transaction [Line Items]
Guarantor obligations, maximum exposure																										8,100,000	$ 22,800,000
SEACOR Holdings | Tax Refund Agreement
Related Party Transaction [Line Items]
Proceeds from cash tax refunds						$ 12,500,000																$ 19,800,000
Cash tax refunds with restrict to use																										$ 8,100,000
OSV Partners
Related Party Transaction [Line Items]
Percentage of initial limited partner interests and general partner interests and initial lp interests held by unrelated third parties																									30.40%
Two Thousand Seventeen Preferred Interests | OSV Partners
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners																														38.60%
Two Thousand Seventeen Preferred Interests | OSV Partners I
Related Party Transaction [Line Items]
Preferred limited partnership interests																					$ 6,000,000.0				$ 6,000,000.0
Two Thousand Seventeen Preferred Interests | OSV Partners I | Caroline
Related Party Transaction [Line Items]
Preferred limited partnership interests																					$ 200,000				$ 200,000
Noncontrolling Interest, ownership percentage by parent																					3.30%				3.30%
Two Thousand Seventeen Preferred Interests | OSV Partners I | Caroline I I
Related Party Transaction [Line Items]
Preferred limited partnership interests																					$ 100,000				$ 100,000
Noncontrolling Interest, ownership percentage by parent																					1.70%				1.70%
Class A Preferred Interests | OSV Partners
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners																														43.00%
P I K Loan Debt And Caroline II | OSV Partners
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners																														43.00%

[1] ^{The Company owned 66.7% of the General Partner and 29.7% of the limited partnership interest of OSV Partners I. On December 31, 2021, the Company purchased the remaining shares in this joint venture that it did not own and consolidated the net assets of OSV Partners. See details below as well as “Note 3. Business Acquisitions”.}

[2] ^{This joint venture holds the investment in UP Offshore. The Company received a cash distribution in excess of its investment in MEXMOR Offshore during 2021. The distribution exceeded the investment value by $9.4 million and this amount was recognized as gain from return of investments in 50% or less owned companies. On December 9, 2021, the Company sold their ownership in this joint venture to the majority shareholder. See details below.}