SEACOR Marine (SMHI) 10-K 26 Feb 25 2024 FY Annual report Financial data

Document And Entity Information

Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Feb. 23, 2025	Jun. 28, 2024
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY
Trading Symbol	SMHI
Entity Registrant Name	SEACOR Marine Holdings Inc.
Entity Central Index Key	0001690334
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Title of 12(b) Security	Common stock
Security Exchange Name	NYSE
Entity File Number	1-37966
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	47-2564547
Entity Address, Address Line One	12121 Wickchester Lane
Entity Address, Address Line Two	Suite 500
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77079
City Area Code	346
Local Phone Number	980-1700
Document Annual Report	true
Document Transition Report	false
Entity Common Stock, Shares Outstanding		27,669,361
Entity Public Float			$ 325.9
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Document financial statement error correction	false
Auditor Firm ID	248
Auditor Name	GRANT THORNTON LLP
Auditor Location	Houston, Texas
Documents Incorporated by Reference	Portions of the Registrant’s definitive proxy statement for its 2024 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission (the “SEC”) pursuant to Regulation 14A within 120 days after the end of the Registrant’s last fiscal year is incorporated by reference into Part III of this Annual Report on Form 10-K.
Auditor Opinion	Opinion on the financial statements We have audited the accompanying consolidated balance sheets of SEACOR Marine Holdings Inc. (a Delaware corporation) and subsidiaries (the “Company”) as of December 31, 2024 and 2023, the related consolidated statements of income (loss), comprehensive income (loss), changes in equity, and cash flows for each of the three years in the period ended December 31, 2024, and the related notes and consolidated financial statement schedule included under Item 15(a) (collectively referred to as the “financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America. We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company’s internal control over financial reporting as of December 31, 2024, based on criteria established in the 2013 Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”), and our report dated February 26, 2025 expressed an unqualified opinion.

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2024	Dec. 31, 2023
Current Assets:
Cash and cash equivalents		$ 59,491	$ 67,455
Restricted cash		16,649	16,676
Receivables:
Trade, net of allowance for credit loss of $4,745 and $4,543 in 2024 and 2023, respectively		69,888	63,728
Other		7,913	11,049
Tax receivable		1,601	983
Inventories		2,760	1,609
Prepaid expenses and other		4,406	2,686
Assets held for sale		10,943	500
Total current assets		173,651	164,686
Property and Equipment:
Historical cost	[1]	900,414	918,823
Accumulated depreciation		(367,448)	(324,141)
Property and equipment		532,966	594,682
Construction in progress		11,904	10,362
Net property and equipment		544,870	605,044
Right-of-use asset - operating leases		3,436	4,291
Right-of-use asset - finance leases		36	37
Investments, at equity, and advances to 50% or less owned companies		3,541	4,125
Other assets		1,577	2,153
Total assets		727,111	780,336
Current Liabilities:
Current portion of operating lease liabilities		606	1,591
Current portion of finance lease liabilities		17	35
Current portion of long-term debt		27,500	28,365
Accounts payable		29,236	27,562
Accrued wages and benefits		5,229	5,083
Accrued interest		1,618	1,850
Accrued capital, repair and maintenance expenditures		8,791	2,471
Unearned revenue		2,534	687
Accrued insurance deductibles and premiums		3,561	3,189
Derivatives		464
Other current liabilities		5,486	6,253
Total current liabilities		85,042	77,086
Long-term operating lease liabilities		2,982	3,529
Long-term finance lease liabilities		20	6
Long-term debt		317,339	287,544
Deferred income taxes		22,037	35,718
Deferred gains and other liabilities		1,369	2,229
Total liabilities		428,789	406,112
SEACOR Marine Holdings Inc. stockholders' equity:
Common stock, $.01 par value, 60,000,000 shares authorized; 28,466,326 and 27,665,792 shares issued in 2024 and 2023, respectively		287	280
Additional paid-in capital		479,283	472,692
Accumulated deficit		(180,600)	(102,425)
Shares held in treasury of 796,965 and 481,014 in 2024 and 2023, respectively, at cost		(8,110)	(4,221)
Accumulated other comprehensive income, net of tax		7,141	7,577
Total stockholders equity		298,001	373,903
Noncontrolling interests in subsidiaries		321	321
Total equity		298,322	374,224
Total liabilities and equity		$ 727,111	$ 780,336
[1] Includes property and equipment acquired in business acquisitions at acquisition date fair value and net of the impact of recognized impairment charges. Most of the Company’s vessels are pledged as collateral under the 2024 SMFH Credit Facility.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Statement of Financial Position [Abstract]
Trade receivables, allowance for credit loss	$ 4,745	$ 4,543
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	60,000,000	60,000,000
Common stock, shares issued (in shares)	28,466,326	27,665,792
Shares held in treasury (in shares)	796,965	481,014

Consolidated Statements of Inco

Consolidated Statements of Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Statement [Abstract]
Operating Revenues	$ 271,361	$ 279,511	$ 217,325
Costs and Expenses:
Operating	197,252	159,650	171,985
Administrative and general	44,713	49,183	40,911
Lease expense	1,678	2,748	3,869
Depreciation and amortization	51,628	53,821	55,957
Costs and expenses	295,271	265,402	272,722
Gains on Asset Dispositions and Impairments, Net	13,481	21,409	1,398
Operating Income (Loss)	(10,429)	35,518	(53,999)
Other Income (Expense):
Interest income	1,768	1,444	784
Interest expense	(40,627)	(37,504)	(29,706)
(Losses) gains on debt extinguishment	(31,923)	(2,004)	10,429
Derivative (losses) gains, net	(908)	608	0
Foreign currency (losses) gains, net	(1,049)	(2,133)	1,659
Other, net	121	0	755
Nonoperating income (expense)	(72,618)	(39,589)	(16,079)
Loss Before Income Tax (Benefit) Expense and Equity in Earnings of 50% or Less Owned Companies	(83,047)	(4,071)	(70,078)
Income Tax (Benefit) Expense:
Current	11,067	13,860	8,485
Deferred	(13,682)	(5,061)	97
Income Tax (Benefit) Expense	(2,615)	8,799	8,582
Loss Before Equity in Earnings of 50% or Less Owned Companies	(80,432)	(12,870)	(78,660)
Equity in Earnings of 50% or Less Owned Companies	2,308	3,556	7,011
Net Loss	(78,124)	(9,314)	(71,649)
Net Income attributable to Noncontrolling Interests in Subsidiaries	0	0	1
Net Loss attributable to SEACOR Marine Holdings Inc.	$ (78,124)	$ (9,314)	$ (71,650)
Net Loss Per Share:
Basic	$ (2.82)	$ (0.34)	$ (2.69)
Diluted	$ (2.82)	$ (0.34)	$ (2.69)
Weighted Average Common Shares and Warrants Outstanding:
Basic	27,655,289	27,082,391	26,626,179
Diluted	27,655,289	27,082,391	26,626,179

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net Loss	$ (78,124)	$ (9,314)	$ (71,649)
Other Comprehensive (Loss) Income:
Foreign currency translation (losses) gains, net	(436)	1,245	(4,451)
Derivative gains on cash flow hedges	0	56	1,608
Other comprehensive income	(436)	730	(1,208)
Income tax expense	0	0	0
Other comprehensive income, net	(436)	730	(1,208)
Comprehensive (Loss) Income	(78,560)	(8,584)	(72,857)
Comprehensive Income Attributable to Noncontrolling Interests in Subsidiaries	0	0	1
Comprehensive (Loss) Income Attributable to SEACOR Marine Holdings Inc.	(78,560)	(8,584)	(72,858)
Interest Expense
Other Comprehensive (Loss) Income:
Reclassification of derivative (gains) losses on cash flow hedges to interest expense	0	(571)	694
Equity Method Investments
Other Comprehensive (Loss) Income:
Reclassification of derivative (gains) losses on cash flow hedges to interest expense	$ 0	$ 0	$ 941

Consolidated Statements of Co_2

Consolidated Statements of Comprehensive Income (Loss) (Parenthetical)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Statement of Comprehensive Income [Abstract]
Reclassification of derivative gains (losses) on cash flow hedges to equity in losses	50%	50%	50%

Consolidated Statements of Chan

Consolidated Statements of Changes In Equity - USD ($) $ in Thousands	Total		Director [Member]	Performance Shares [Member]	Common Stock [Member]	Common Stock [Member] Director [Member]	Common Stock [Member] Performance Shares [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Treasury Stock [Member] Director [Member]	Treasury Stock [Member] Performance Shares [Member]	Retained Earnings (Accumulated Deficit) [Member]	Accumulated Other Comprehensive Income [Member]	Non-Controlling Interests In Subsidiaries [Member]
Balance at Dec. 31, 2021	$ 446,541				$ 262			$ 461,931	$ (1,120)			$ (22,907)	$ 8,055	$ 320
Balance (in shares) at Dec. 31, 2021					25,992,237				127,887
Restricted stock grants	9				$ 9
Restricted stock grants (in shares)					738,896
Forfeiture of employee share awards (in shares)					(3,500)
Amortization of share awards	4,587							4,587
Exercise of options	$ 151							151
Exercise of options (in shares)	34,492	[1]			34,492
Restricted stock vesting	$ (672)		$ (60)						$ (672)	$ (60)
Restricted stock vesting (in shares)					(114,251)	(6,500)			114,251	6,500
Director share awards			1			$ 1
Director share awards (in shares)						60,787
Net loss	(71,649)											(71,650)		1
Other comprehensive income	238											1,446	(1,208)
Balance at Dec. 31, 2022	379,146				$ 272			466,669	$ (1,852)			(93,111)	6,847	321
Balance (in shares) at Dec. 31, 2022					26,702,161				248,638
Issuance of common stock	24							24
Issuance of Common Stock (in shares)					7,674
Restricted stock grants	6				$ 6
Restricted stock grants (in shares)					525,397
Forfeiture of employee share awards (in shares)					(15,000)
Amortization of share awards	5,993							5,993
Exercise of options	$ 6							6
Exercise of options (in shares)	834	[1]			834
Exercise of warrants					$ 1				$ (1)
Exercise of Warrants (in shares)					135,013				137
Restricted stock vesting	$ (2,368)								$ (2,368)
Restricted stock vesting (in shares)					(232,239)				232,239
Director share awards			1			$ 1
Director share awards (in shares)						60,938
Net loss	(9,314)											(9,314)
Other comprehensive income	730												730
Balance at Dec. 31, 2023	$ 374,224				$ 280			472,692	$ (4,221)			(102,425)	7,577	321
Balance (in shares) at Dec. 31, 2023	27,665,792				27,184,778				481,014
Restricted stock grants	$ 6				$ 6
Restricted stock grants (in shares)					563,271
Amortization of share awards	6,451							6,451
Exercise of options	$ 140							140
Exercise of options (in shares)	12,166	[1]			12,166
Exercise of Warrants (in shares)					24,099				39
Restricted stock vesting	$ (3,120)			$ (769)					$ (3,120)		$ (769)
Restricted stock vesting (in shares)					(251,333)	(3,274)	96,150		251,333	3,274	61,305
Director share awards			$ 1			$ 1
Director share awards (in shares)						43,504
Net loss	(78,124)											(78,124)
Other comprehensive income	(487)											(51)	(436)
Balance at Dec. 31, 2024	$ 298,322				$ 287			$ 479,283	$ (8,110)			$ (180,600)	$ 7,141	$ 321
Balance (in shares) at Dec. 31, 2024	28,466,326				27,669,361				796,965
[1] The intrinsic value of the options exercised was less than $ 0.1 million.

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash Flows from Operating Activities:
Net Loss	$ (78,124,000)	$ (9,314,000)	$ (71,649,000)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	51,628,000	53,821,000	55,957,000
Deferred financing cost amortization	1,144,000	1,579,000	8,000
Stock-based compensation expense	6,458,000	6,000,000	4,597,000
Debt discount amortization	7,779,000	6,761,000	6,693,000
Allowance for credit losses	202,000	3,519,000	489,000
Gains from equipment sales, retirements or impairments	(13,481,000)	(21,409,000)	(1,398,000)
Losses (gains) on debt extinguishment	28,252,000	177,000	(12,700,000)
Derivative losses (gains)	908,000	(608,000)	0
Interest on finance leases	3,000	202,000	244,000
Settlement on derivative transactions, net	164,000	577,000	(749,000)
Currency losses (gains)	1,049,000	2,133,000	(1,659,000)
Deferred income taxes	(13,682,000)	(5,061,000)	97,000
Equity earnings	(2,308,000)	(3,556,000)	(7,011,000)
Dividends received from 50% or less owned companies	2,916,000	2,241,000	3,057,000
Changes in Operating Assets and Liabilities:
Accounts receivables	(4,600,000)	(17,215,000)	(652,000)
Other assets	(1,315,000)	2,288,000	2,559,000
Accounts payable and accrued liabilities	2,745,000	(13,188,000)	7,501,000
Net cash (used in) provided by operating activities	(10,262,000)	8,947,000	(14,616,000)
Cash Flows from Investing Activities:
Purchases of property and equipment	(7,294,000)	(10,604,000)	(462,000)
Proceeds from disposition of property and equipment	24,858,000	44,730,000	6,734,000
Principal payments on notes due from 50% or less owned companies	0	0	528,000
Proceeds from sale of investment in 50% or less owned companies	0	0	66,000,000
Notes due from others	0	0	(28,831,000)
Principal payments on notes due from others	0	15,000,000	13,831,000
Net cash provided by investing activities	17,564,000	49,126,000	57,800,000
Cash Flows from Financing Activities:
Payments on long-term debt	(24,312,000)	(29,165,000)	(38,152,000)
Payments on debt extinguishment	(328,712,000)	(131,604,000)	0
Payments on debt extinguishment costs	(3,671,000)	(1,827,000)	(2,271,000)
Proceeds from issuance of long-term debt, net of debt discount and issuance costs	345,192,000	148,475,000	0
Proceeds from issuance of common stock, net of issuance costs	0	24,000	0
Proceeds from exercise of stock options and warrants	140,000	6,000	151,000
Payments on finance lease	(41,000)	(531,000)	(351,000)
Tax withholdings on restricted stock vesting and director share awards	(3,889,000)	(2,368,000)	(732,000)
Net cash used in financing activities	(15,293,000)	(16,990,000)	(41,355,000)
Effects of Exchange Rate Changes on Cash, Cash Equivalents and Restricted Cash	0	3,000	(4,000)
Net Change in Cash, Cash Equivalents and Restricted Cash	(7,991,000)	41,086,000	1,825,000
Cash, Cash Equivalents and Restricted Cash, Beginning of Year	84,131,000	43,045,000	41,220,000
Cash, Cash Equivalents and Restricted Cash, End of Year	76,140,000	84,131,000	43,045,000
Supplemental disclosures:
Cash paid for interest, excluding capitalized interest	35,607,000	31,446,000	25,244,000
Income taxes (paid) refunded, net	(625,000)	(2,961,000)	885,000
Noncash Investing and Financing Activities:
Increase in capital expenditures in accounts payable and accrued liabilities	6,166,000	371,000	0
Exchange of property and equipment	0	0	8,918,000
Recognition of a new right-of-use asset - operating leases	0	499,000	2,363,000
Recognition of a new right-of-use asset - finance leases	$ 34,000	$ 0	$ 7,248,000

Cybersecurity Risk Management,

Cybersecurity Risk Management, Strategy and Governance	12 Months Ended
	Dec. 31, 2024
Cybersecurity Risk Management, Strategy, and Governance [Line Items]
Cybersecurity Risk Management Processes for Assessing, Identifying, and Managing Threats [Text Block]	ITEM 1C. CYBERSECURITY The Company relies on technology infrastructure and information systems, including the Internet and cloud services, to process, transmit and store electronic and financial information, manage a variety of business processes and activities, and comply with regulatory, legal and tax requirements. The Company also depends on its information technology infrastructure to capture knowledge of its business including its vessel operation systems, which contain information about vessel positioning and scheduling; monitor its vessel maintenance and engine systems; coordinate its business across its bases of operation including cargo delivery and equipment tracking; and communicate within its organization and with customers, suppliers, partners and other third parties. The Company’s ability to service customers and operate vessels is dependent on the continued operation of these systems. While the Company takes various precautions and has enhanced controls around its systems, like other technology systems, they are susceptible to damage, disruptions or shutdowns, hardware or software failures, power outages, computer viruses, telecommunication failures, user errors, catastrophic events, or cyber-attacks including malware, other malicious software, phishing email attacks, attempts to gain unauthorized access to its data, the unauthorized release, corruption or loss of its data, loss or damage to its data delivery systems, ransomware, and other electronic security breaches. Over time, these attacks have become increasingly sophisticated and, in some cases, have been conducted or sponsored by “nation state” operators. The Company expects that sophistication of cyber-threats will continue to evolve as threat actors increase their use of AI and machine-learning technologies. Many threat actors are well funded. The Company has implemented robust processes to assess, identify, and manage cybersecurity risks, including potentially material risks, related to the Company’s internal information systems and its services. The Board of Directors has direct oversight of the Company’s risk management process and the management of cybersecurity risks. Under the direction and supervision of the Company’s Chief Financial Officer, the Company conducts periodic risk assessments, which include cybersecurity risks . Management provides a comprehensive update to the Board of Directors on cybersecurity threats and risk mitigation at least annually, and more frequently as relevant. The Company’s Director of Technology, reporting to the Chief Financial Officer, has principal responsibility for assessing and managing cybersecurity risks and threats, implementing the systems necessary to address such risks and threats, and preparing updates for the Board of Directors. The Director of Technology has a combined twenty-one years of experience leading and working on cybersecurity teams at the Company and other companies in the oil and natural gas industry, has significant experience with networking, on-premises and cloud-based infrastructure, and cybersecurity controls, and has a Bachelor of Science degree. In response to the increasing threats presented by cyber incidents, in April 2022 the Company established a Cybersecurity Committee, which meets regularly. This committee is comprised of the Director of Technology, members of management from the technology, quality, health, safety and environment and operations departments, as well as the Chief Financial Officer and the General Counsel, both of whom report to the Chief Executive Officer. The Cybersecurity Committee oversees activities related to the monitoring, prevention, detection, mitigation and remediation of cybersecurity risks. The Cybersecurity Committee develops and implements cybersecurity risk mitigation strategies and activities throughout the year, including the management of comprehensive incident response plans, oversees the cybersecurity risks posed by third-party vendors and receives regular updates on cybersecurity-related matters. The Company has adopted the National Institute of Standards and Technology (“NIST”) Cybersecurity Framework to continuously evaluate and enhance its cybersecurity procedures. Activities include mandatory quarterly online training for all employees, technical security controls, enhanced data protection, the maintenance of backup and protective systems, policy review and implementation, periodic assessments of third-party service providers to assess cyber preparedness of key vendors, and running simulated cybersecurity drills, including vulnerability scanning, penetration testing and disaster recovery exercises, throughout the organization. These cybersecurity drills are performed both in-house and by third-party service providers. The Company uses automated tools that monitor, detect, and prevent cybersecurity risks that are monitored by the technology department and a third-party vendor. As noted above, the Cybersecurity Committee is also implementing comprehensive incident response plans that outline the appropriate communication flow and response for certain categories of potential cybersecurity incidents. The Cybersecurity Committee escalates events, including to the Chief Executive Officer and Board of Directors, as relevant, based on the materiality of the event. When the Company experiences a cybersecurity incident, the Director of Technology will inform the Cybersecurity Committee, which will then evaluate and assess the materiality of the incident to the Company, its information technology infrastructure and data integrity, and, in particular, whether the cybersecurity incident should be reported to the Board of Directors in advance of or external to the next regular cybersecurity update. Once a cybersecurity incident is reported to the Board of Directors, the Board of Directors provides oversight of the Company’s response to such incident, including considerations around disclosure of the event. The Cybersecurity Committee continuously monitors incidents as they are remedied to ensure proper remediation and, if necessary, the ability to report to the Board of Directors if previously unknown material information arises during such remediation. The Company engages subject matter experts such as consultants and auditors to assist us in establishing processes to assess, identify, and manage potential and actual cybersecurity threats, to actively monitor the Company’s systems internally using widely accepted digital applications, processes, and controls, and to provide forensic assistance to facilitate system recovery in the case of an incident. The Cybersecurity Committee oversees and establishes the parameters of the Company’s engagement with these experts to ensure the Company obtains the supplemental assistance needed in this area, if any. The Company’s information technology systems are in some cases integrated, such that damage, disruption or shutdown to one system could result in a more widespread impact on the Company’s systems as a whole. If the Company’s information technology systems suffer severe damage, disruption or shutdown, and its business continuity plans do not effectively resolve the issues in a timely manner, the Company’s business could be negatively affected. In addition, cyber-attacks could lead to potential unauthorized access and disclosure of confidential information, data loss and corruption, see “Item 1A. Risk Factors” under the heading “The Company relies on information technology, and if it is unable to protect against service interruptions, data corruption, cyber-based attacks or network security breaches, its operations could be disrupted and its business could be negatively affected” of this Annual Report on Form 10-K. A cybersecurity incident could materially harm the Company’s reputation and financial condition and cause us to incur legal liability and increased costs to respond to such events.
Cybersecurity Risk Management Processes Integrated [Flag]	true
Cybersecurity Risk Management Processes Integrated [Text Block]	The Company has implemented robust processes to assess, identify, and manage cybersecurity risks, including potentially material risks, related to the Company’s internal information systems and its services.
Cybersecurity Risk Management Third Party Engaged [Flag]	true
Cybersecurity Risk Third Party Oversight and Identification Processes [Flag]	true
Cybersecurity Risk Materially Affected or Reasonably Likely to Materially Affect Registrant [Flag]	false
Cybersecurity Risk Board of Directors Oversight [Text Block]	The Company has implemented robust processes to assess, identify, and manage cybersecurity risks, including potentially material risks, related to the Company’s internal information systems and its services. The Board of Directors has direct oversight of the Company’s risk management process and the management of cybersecurity risks. Under the direction and supervision of the Company’s Chief Financial Officer, the Company conducts periodic risk assessments, which include cybersecurity risks . Management provides a comprehensive update to the Board of Directors on cybersecurity threats and risk mitigation at least annually, and more frequently as relevant. The Company’s Director of Technology, reporting to the Chief Financial Officer, has principal responsibility for assessing and managing cybersecurity risks and threats, implementing the systems necessary to address such risks and threats, and preparing updates for the Board of Directors. The Director of Technology has a combined twenty-one years of experience leading and working on cybersecurity teams at the Company and other companies in the oil and natural gas industry, has significant experience with networking, on-premises and cloud-based infrastructure, and cybersecurity controls, and has a Bachelor of Science degree. In response to the increasing threats presented by cyber incidents, in April 2022 the Company established a Cybersecurity Committee, which meets regularly. This committee is comprised of the Director of Technology, members of management from the technology, quality, health, safety and environment and operations departments, as well as the Chief Financial Officer and the General Counsel, both of whom report to the Chief Executive Officer. The Cybersecurity Committee oversees activities related to the monitoring, prevention, detection, mitigation and remediation of cybersecurity risks. The Cybersecurity Committee develops and implements cybersecurity risk mitigation strategies and activities throughout the year, including the management of comprehensive incident response plans, oversees the cybersecurity risks posed by third-party vendors and receives regular updates on cybersecurity-related matters. The Company has adopted the National Institute of Standards and Technology (“NIST”) Cybersecurity Framework to continuously evaluate and enhance its cybersecurity procedures. Activities include mandatory quarterly online training for all employees, technical security controls, enhanced data protection, the maintenance of backup and protective systems, policy review and implementation, periodic assessments of third-party service providers to assess cyber preparedness of key vendors, and running simulated cybersecurity drills, including vulnerability scanning, penetration testing and disaster recovery exercises, throughout the organization. These cybersecurity drills are performed both in-house and by third-party service providers. The Company uses automated tools that monitor, detect, and prevent cybersecurity risks that are monitored by the technology department and a third-party vendor. As noted above, the Cybersecurity Committee is also implementing comprehensive incident response plans that outline the appropriate communication flow and response for certain categories of potential cybersecurity incidents. The Cybersecurity Committee escalates events, including to the Chief Executive Officer and Board of Directors, as relevant, based on the materiality of the event. When the Company experiences a cybersecurity incident, the Director of Technology will inform the Cybersecurity Committee, which will then evaluate and assess the materiality of the incident to the Company, its information technology infrastructure and data integrity, and, in particular, whether the cybersecurity incident should be reported to the Board of Directors in advance of or external to the next regular cybersecurity update. Once a cybersecurity incident is reported to the Board of Directors, the Board of Directors provides oversight of the Company’s response to such incident, including considerations around disclosure of the event. The Cybersecurity Committee continuously monitors incidents as they are remedied to ensure proper remediation and, if necessary, the ability to report to the Board of Directors if previously unknown material information arises during such remediation.
Cybersecurity Risk Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Board of Directors has direct oversight of the Company’s risk management process and the management of cybersecurity risks. Under the direction and supervision of the Company’s Chief Financial Officer, the Company conducts periodic risk assessments, which include cybersecurity risks
Cybersecurity Risk Process for Informing Board Committee or Subcommittee Responsible for Oversight [Text Block]	The Company has implemented robust processes to assess, identify, and manage cybersecurity risks, including potentially material risks, related to the Company’s internal information systems and its services. The Board of Directors has direct oversight of the Company’s risk management process and the management of cybersecurity risks. Under the direction and supervision of the Company’s Chief Financial Officer, the Company conducts periodic risk assessments, which include cybersecurity risks . Management provides a comprehensive update to the Board of Directors on cybersecurity threats and risk mitigation at least annually, and more frequently as relevant. The Company’s Director of Technology, reporting to the Chief Financial Officer, has principal responsibility for assessing and managing cybersecurity risks and threats, implementing the systems necessary to address such risks and threats, and preparing updates for the Board of Directors. The Director of Technology has a combined twenty-one years of experience leading and working on cybersecurity teams at the Company and other companies in the oil and natural gas industry, has significant experience with networking, on-premises and cloud-based infrastructure, and cybersecurity controls, and has a Bachelor of Science degree.
Cybersecurity Risk Role of Management [Text Block]	The Board of Directors has direct oversight of the Company’s risk management process and the management of cybersecurity risks. Under the direction and supervision of the Company’s Chief Financial Officer, the Company conducts periodic risk assessments, which include cybersecurity risks . Management provides a comprehensive update to the Board of Directors on cybersecurity threats and risk mitigation at least annually, and more frequently as relevant. The Company’s Director of Technology, reporting to the Chief Financial Officer, has principal responsibility for assessing and managing cybersecurity risks and threats, implementing the systems necessary to address such risks and threats, and preparing updates for the Board of Directors.
Cybersecurity Risk Management Positions or Committees Responsible [Flag]	true
Cybersecurity Risk Management Positions or Committees Responsible [Text Block]	The Company has adopted the National Institute of Standards and Technology (“NIST”) Cybersecurity Framework to continuously evaluate and enhance its cybersecurity procedures. Activities include mandatory quarterly online training for all employees, technical security controls, enhanced data protection, the maintenance of backup and protective systems, policy review and implementation, periodic assessments of third-party service providers to assess cyber preparedness of key vendors, and running simulated cybersecurity drills, including vulnerability scanning, penetration testing and disaster recovery exercises, throughout the organization. These cybersecurity drills are performed both in-house and by third-party service providers. The Company uses automated tools that monitor, detect, and prevent cybersecurity risks that are monitored by the technology department and a third-party vendor. As noted above, the Cybersecurity Committee is also implementing comprehensive incident response plans that outline the appropriate communication flow and response for certain categories of potential cybersecurity incidents. The Cybersecurity Committee escalates events, including to the Chief Executive Officer and Board of Directors, as relevant, based on the materiality of the event.
Cybersecurity Risk Management Expertise of Management Responsible [Text Block]	The Director of Technology has a combined twenty-one years of experience leading and working on cybersecurity teams at the Company and other companies in the oil and natural gas industry, has significant experience with networking, on-premises and cloud-based infrastructure, and cybersecurity controls, and has a Bachelor of Science degree.
Cybersecurity Risk Process for Informing Management or Committees Responsible [Text Block]	The Cybersecurity Committee oversees activities related to the monitoring, prevention, detection, mitigation and remediation of cybersecurity risks.
Cybersecurity Risk Management Positions or Committees Responsible Report to Board [Flag]	true

Pay vs Performance Disclosure

Pay vs Performance Disclosure - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pay vs Performance Disclosure
Net Income (Loss)	$ (78,124)	$ (9,314)	$ (71,650)

Insider Trading Arrangements

Insider Trading Arrangements	3 Months Ended
	Dec. 31, 2024 shares
Trading Arrangements, by Individual
Material Terms of Trading Arrangement	ITEM 9B. OTHER INFORMATION During the fourth quarter of 2024 , none of our directors or Section 16 officers adopted or terminated a “Rule 10b5-1 trading arrangement” or “non-Rule 10b5-1 trading arrangement” (as each term is defined in Item 408(a) of Regulation S-K), except as set forth in the table below: Name and Title Action Date Type of Trading Arrangement (1) Duration of Trading Arrangement (2) Aggregate Number of Securities to be Sold pursuant to Trading Arrangement Andrew H. Everett II , Senior Vice President, General Counsel and Secretary Adoption December 3, 2024 Rule 10b5-1 trading arrangement April 2, 2026 Up to 100,000 shares of Common Stock Jesús Llorca , Executive Vice President and Chief Financial Officer Adoption December 3, 2024 Rule 10b5-1 trading arrangement March 6, 2026 Up to 309,925 shares of Common Stock (3) Gregory Rossmiller , Senior Vice President and Chief Accounting Officer Adoption December 5, 2024 Rule 10b5-1 trading arrangement March 6, 2026 Up to 79,824 shares of Common Stock John Gellert , President and Chief Executive Officer Adoption December 17, 2024 Rule 10b5-1 trading arrangement March 20, 2026 Up to 224,362 shares of Common Stock (4) (1) Each trading arrangement marked as a “Rule 10b5-1 trading arrangement” is intended to satisfy the affirmative defense of Rule 10b5-1(c). (2) Each trading arrangement permits transactions through and including the earlier to occur of (i) the completion of all sales under the trading arrangement and (ii) the date listed in the table. (3) Mr. Llorca’s Rule 10b5-1 trading arrangement provides for the potential sale of up to (i) 159,925 shares of Common Stock and (ii) 150,000 shares of Common Stock issuable upon the exercise of options to acquire shares of Common Stock. (4) Mr. Gellert’s Rule 10b5-1 trading arrangement provides for the potential sale of up to (i) 74,362 shares of Common Stock and (ii) 150,000 shares of Common Stock issuable upon the exercise of options to acquire shares of Common Stock.
Rule 10b5-1 Arrangement Adopted	false
Non-Rule 10b5-1 Arrangement Adopted	false
Rule 10b5-1 Arrangement Terminated	false
Non-Rule 10b5-1 Arrangement Terminated	false
Andrew H. Everett II
Trading Arrangements, by Individual
Name	Andrew H. Everett II
Title	Senior Vice President, General Counsel and Secretary
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 3, 2024
Expiration Date	April 2, 2026
Aggregate Available	100,000
Jesus Llorca
Trading Arrangements, by Individual
Name	Jesús Llorca
Title	Executive Vice President and Chief Financial Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 3, 2024
Expiration Date	March 6, 2026
Aggregate Available	309,925
Gregory Rossmiller
Trading Arrangements, by Individual
Name	Gregory Rossmiller
Title	Senior Vice President and Chief Accounting Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 5, 2024
Expiration Date	March 6, 2026
Aggregate Available	79,824
John Gellert
Trading Arrangements, by Individual
Name	John Gellert
Title	President and Chief Executive Officer
Rule 10b5-1 Arrangement Adopted	true
Adoption Date	December 17, 2024
Expiration Date	March 20, 2026
Aggregate Available	224,362
Rule 10b51 Arr Potential Sale of Shares [Member] | Jesus Llorca
Trading Arrangements, by Individual
Aggregate Available	159,925
Rule 10b51 Arr Potential Sale of Shares [Member] | John Gellert
Trading Arrangements, by Individual
Aggregate Available	74,362
Rule10b51Arr Stock Issuable Upon Exercise Of Option [Member] | Jesus Llorca
Trading Arrangements, by Individual
Aggregate Available	150,000
Rule10b51Arr Stock Issuable Upon Exercise Of Option [Member] | John Gellert
Trading Arrangements, by Individual
Aggregate Available	150,000

Insider Trading Policies and Pr

Insider Trading Policies and Procedures	12 Months Ended
	Dec. 31, 2024
Insider Trading Policies and Procedures [Line Items]
Insider Trading Policies and Procedures Adopted	true

Nature of Operations and Accoun

Nature of Operations and Accounting Policies	12 Months Ended
	Dec. 31, 2024
Nature Of Operation And Accounting Policies [Abstract]
Nature of Operations and Accounting Policies	1. NATURE OF OPERATIONS AND ACCOUNTING POLICIES Nature of Operations and Segmentation. The consolidated financial statements include the accounts of SEACOR Marine Holdings Inc. (“SEACOR Marine”), and its consolidated subsidiaries (collectively referred to as the “Company”). The Company provides global marine and support transportation services to offshore energy facilities worldwide. The Company operates and manages a diverse fleet of offshore support vessels that (i) deliver cargo and personnel to offshore installations, including offshore wind farms, (ii) assist offshore operations for production and storage facilities, (iii) provide construction, well work-over, offshore wind farm installation and decommissioning support, and (iv) carry and launch equipment used underwater in drilling and well installation, maintenance, inspection and repair. Additionally, the Company's vessels provide emergency response services and accommodations for technicians and specialists. Accounting standards require public business enterprises to report information about each of their operating business segments that exceed certain quantitative thresholds or meet certain other reporting requirements. Operating business segments have been defined as a component of an enterprise about which separate financial information is available and is evaluated regularly by the chief operating decision maker, the President and Chief Executive Officer, in assessing performance and allocating resources. The Company has identified the following four principal geographic regions as its reporting segments: United States, primarily Gulf of America. As of December 31, 2024 , 10 owned vessels were located in this region. The Company’s vessels in this market support oil and natural gas exploration and production activities, seasonal construction, decommissioning and diving support operations, as well as the construction and maintenance of offshore wind farms in the Northeast of the U.S. Africa and Europe. As of December 31, 2024 , 20 vessels were located in this region, including 19 owned and one managed. The Company’s vessels in this market generally support projects for major oil companies, primarily in Angola, Nigeria and the North Sea. Middle East and Asia. As of December 31, 2024 , 15 vessels were located in this region, including 13 owned and two managed . The Company’s vessels in this area generally support exploration, personnel transport and seasonal construction activities in Saudi Arabia, United Arab Emirates, Qatar, Egypt and Israel. Latin America. As of December 31, 2024 , nine owned vessels were located in this region. The Company’s vessels in this area generally provide support for exploration and production activities primarily in Mexico, Guyana and Trinidad and Tobago. From time to time, the Company’s vessels also work in Brazil and Colombia. Basis of Consolidation. The consolidated financial statements include the accounts of SEACOR Marine and its controlled subsidiaries. Control is generally deemed to exist if the Company has greater than 50 % of the voting rights of a subsidiary. All significant intercompany accounts and transactions are eliminated in the combination and consolidation. Noncontrolling interests in consolidated subsidiaries are included in the consolidated balance sheets as a separate component of equity. The Company reports consolidated net income (loss) inclusive of both the Company’s and the noncontrolling interests’ share, as well as the amounts of consolidated net income (loss) attributable to each of the Company and the noncontrolling interests. If a subsidiary is deconsolidated upon a change in control, any retained noncontrolling equity investment in the former controlled subsidiary is measured at fair value and a gain or loss is recognized in net income (loss) based on such fair value. If a subsidiary is consolidated upon the business acquisition of controlling interests by the Company, any previous noncontrolled equity investment in the subsidiary is measured at fair value and a gain or loss is recognized in net income (loss) based on such fair value. The Company employs the equity method of accounting for investments in 50% or less owned companies that it does not control but has the ability to exercise significant influence over the operating and financial policies of the business venture. Significant influence is generally deemed to exist if the Company has between 20 % and 50 % of the voting rights of a business venture but may exist when the Company’s ownership percentage is less than 20%. In certain circumstances, the Company may have an economic interest in excess of 50% but may not control and consolidate the business venture. Conversely, the Company may have an economic interest less than 50% but may control and consolidate the business venture. The Company reports its investments in and advances to these business ventures in the accompanying consolidated balance sheets as investments, at equity, and advances to 50% or less owned companies. The Company reports its share of earnings from investments in 50% or less owned companies in the accompanying consolidated statements of income (loss) as equity in earnings of 50% or less owned companies, net of tax. Certain reclassifications were made to previously reported amounts in the consolidated financial statements and notes thereto to make them consistent with the current period presentation. Use of Estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“U.S.”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from estimates and those differences may be material. Revenue Recognition. The Company contracts with various customers to carry out management services for vessels as agents for and on behalf of ship owners. These services include crew management, technical management, commercial management, insurance arrangements, sale and purchase of vessels, provisions and bunkering. As the manager of the vessels, the Company undertakes to use its best endeavors to provide the agreed management services as agents for and on behalf of the owners in accordance with sound ship management practice and to protect and promote the interest of the owners in all matters relating to the provision of services thereunder. The Company also contracts with various customers to carry out management services regarding engineering for vessel construction and vessel conversions. The vast majority of the ship management agreements span one to three years and are typically billed on a monthly basis. The Company transfers control of the service to the customer and satisfies its performance obligation over the term of the contract, and therefore recognizes revenue over the term of the contract while related costs are expensed as incurred. Revenue that does not meet these criteria is deferred until the criteria is met and is considered a contract liability and is recognized as such. Contract liabilities, which are included in unearned revenue in the accompanying consolidated balance sheets, for the years ended December 31 were as follows (in thousands): 2024 2023 2022 Balance at beginning of year $ 687 $ 2,333 $ 1,606 Unearned revenues during the year 6,689 6,501 4,288 Revenues recognized during the year ( 4,842 ) ( 8,147 ) ( 3,561 ) Balance at end of year $ 2,534 $ 687 $ 2,333 As of December 31, 2024, December 31, 2023 and December 31, 2022 , the Company had unearned revenue of $ 2.5 million, $ 0.7 million and $ 2.3 million, respectively, primarily related to mobilization of vessels. The Company earns revenue primarily from the time charter and bareboat charter of vessels to customers. Since the Company charges customers based upon daily rates of hire, vessel revenues are recognized on a daily basis throughout the contract period. Under a time charter, the Company provides a vessel to a customer and is responsible for all operating expenses, typically excluding fuel. Under a bareboat charter, the Company provides a vessel to a customer and the customer assumes responsibility for all operating expenses and assumes all risks of operation. In the U.S. Gulf of America, time charter durations and rates are typically established in the context of master service agreements that govern the terms and conditions of the charter. In the Company’s operating areas, contracts or charters vary in length from several days to multi-year periods. Many of the Company’s contracts and charters include cancellation clauses without early termination penalties. As a result of cancellations, options and frequent renewals, the stated duration of charters may not correlate with the length of time the vessel is contracted for to provide services to a particular customer. During the year ended December 31, 2024, the Company did no t recognize any business interruption insurance recoveries. During the years ended December 31, 2023 and 2022, the Company recognized an aggregate amount of business interruption insurance recoveries of $ 10.0 million and $ 1.9 million, respectively, included in operating revenues in the accompanying consolidated statements of income (loss). Direct Operating Expenses. Direct operating costs and expenses that are considered significant, other than leased-in equipment expense, consist primarily of costs and expenses such as: personnel; repairs and maintenance; drydocking; insurance and loss reserves; and fuel, lubes and supplies. Other direct operating expenses consist of costs such as brokers’ commissions, communication costs, expenses incurred in mobilizing vessels between geographic regions, third party ship management fees, freight expenses, and customs and importation duties. Direct operating costs are expensed as incurred. Cash Equivalents. The Company considers all highly liquid investments, with an original maturity of three months or less from the date purchased, to be cash equivalents. Cash equivalents consist of U.S. treasury securities, money market instruments, time deposits and overnight investments. A portion of the Company’s cash is maintained at federally insured financial institutions. The deposits held at these institutions are in excess of federally insured limits. The Company has not experienced any losses in such accounts and management believes that the Company is not exposed to significant credit risk due to the financial position of the depository institution in which those deposits are held. Restricted Cash. Restricted cash primarily relates to banking and credit facility requirements, including, as of December 31, 2024, $ 16.0 million held in a restricted account with various permitted uses under the terms of the 2024 SMFH Credit Facility. For the years ended December 31, cash, cash equivalents and restricted cash consists of (in thousands): 2024 2023 Cash $ 59,491 $ 67,455 Restricted cash 16,649 16,676 Total $ 76,140 $ 84,131 Trade and Other Receivables and Allowance for Credit Losses. Customers are primarily major integrated national, international oil companies, large independent oil and natural gas exploration and production companies and established wind farm construction companies. Customers are granted credit on a short-term basis and the related credit risks are minimal. Other receivables consist primarily of operating expenses the Company incurs in relation to vessels it manages for other entities, as well as insurance and income tax receivables. During the year ended December 31, 2024, Azule Energy Angola S.p.A., a joint venture between BP p.l.c. and Eni S.p.A., and SEACOR Marine Arabia, a joint venture of which the Company owns 45 % and through which vessels are in service to Saudi Arabian Oil Company, were responsible for $ 18.3 million or 26 % and $ 13.0 million or 19 %, respectively, of the Company’s total consolidated trade receivables. During the year ended December 31, 2023, SEACOR Marine Arabia and Azule Energy Angola S.p.A. were responsible for $ 14.4 million or 22 % and $ 11.9 million or 18 %, respectively, of the Company’s total consolidated trade receivables. The Company routinely reviews its receivables and makes provisions for expected credit losses utilizing the Current Expected Credit Losses model (“CECL”). The CECL model utilizes a lifetime expected credit loss measurement objective for the recognition of credit losses for loans and other receivables at the time the financial asset is originated or acquired. However, those provisions are estimates and actual results may materially differ from those estimates. After collection efforts have been exhausted, trade receivables that are deemed uncollectible are removed from both accounts receivable and the allowance for credit losses. Allowance for credit loss reserves for the years ended December 31 were as follows (in thousands): Description Balance Reserves Acquired Charges Deductions Balance Year Ended December 31, 2024 Allowance for credit loss reserves (deducted from trade and notes receivable) $ 4,543 $ — $ 202 $ — $ 4,745 Year Ended December 31, 2023 Allowance for credit loss reserves (deducted from trade and notes receivable) $ 1,650 $ — $ 3,519 $ ( 626 ) $ 4,543 Year Ended December 31, 2022 Allowance for credit loss reserves (deducted from trade and notes receivable) $ 1,312 $ — $ 489 $ ( 151 ) $ 1,650 Derivative Instruments. The Company accounts for derivatives through the use of a fair value concept whereby all of the Company’s derivative positions are stated at fair value in the accompanying consolidated balance sheets. Realized and unrealized gains and losses on derivatives not designated as hedges are reported in the accompanying consolidated statements of income (loss) as Derivative gains (losses), net. Realized and unrealized gains and losses on derivatives designated as fair value hedges are recognized as corresponding increases or decreases in the fair value of the underlying hedged item to the extent they are effective, with any ineffective portion reported in the accompanying consolidated statements of income (loss) as Derivative gains (losses), net, and related cash flows are classified in the same category on the cash flow statement as the cash flows from the items being hedged. Realized and unrealized gains and losses on derivatives designated as cash flow hedges are reported as a component of other comprehensive income (loss) in the accompanying consolidated statements of comprehensive income (loss) to the extent they are effective and reclassified into earnings on the same line item associated with the hedged transaction and in the same period the hedged transaction affects earnings and related cash flows are classified in the same category on the cash flow statement as the cash flows from the items being hedged. Any ineffective portions of cash flow hedges are reported in the accompanying consolidated statements of income (loss) as Derivative gains (losses), net. Realized and unrealized gains and losses on derivatives designated as cash flow hedges that are entered into by the Company’s 50% or less owned companies are also reported as a component of the Company’s other comprehensive income (loss) in proportion to the Company’s ownership percentage, with reclassifications and ineffective portions being included in Equity in earnings of 50% or less owned companies, net of tax, in the accompanying consolidated statements of income (loss). Concentrations of Credit Risk. The Company is exposed to concentrations of credit risk associated with its cash and cash equivalents, restricted cash and derivative instruments. The Company minimizes its credit risk relating to these positions by monitoring the financial condition of the financial institutions and counterparties involved and by primarily conducting business with large, well-established financial institutions and diversifying its counterparties. The Company does not currently anticipate nonperformance by any of its significant counterparties. The Company is also exposed to concentrations of credit risk relating to its receivables due from customers described above. The Company does not generally require collateral or other security to support its outstanding receivables. The Company minimizes its credit risk relating to receivables by performing ongoing credit evaluations and, to date, credit losses have not been material. Inventories. Inventories, which consist of fuel and supplies, are stated at the lower of cost (using the first-in, first-out method) or net realizable value. The Company records write-downs, as needed, to adjust the carrying amount of inventories to the lower of cost or net realizable value. In the years ended December 31, 2024, 2023 and 2022 , there were no inventory reserves. Property and Equipment. Equipment, stated at cost, is depreciated using the straight-line method over the estimated useful life of the asset to an estimated salvage value. With respect to each class of asset, the estimated useful life is based upon a newly built asset being placed into service and represents the time period beyond which it is typically not justifiable for the Company to continue to operate the asset in the same or similar manner. From time to time, the Company may acquire older vessels that have already exceeded the Company’s useful life policy, in which case the Company depreciates such assets based on its best estimate of the asset’s remaining useful life, typically the period until the next survey or certification date. As of December 31, 2024 , the estimated useful life of the Company’s new offshore support vessels was 20 years. The Company’s property and equipment as of December 31 was as follows (in thousands): Historical (1) Accumulated Net Book 2024 Offshore support vessels: AHTS (2) $ 948 $ ( 825 ) $ 123 FSV (3) 344,833 ( 160,823 ) 184,010 PSV (4) 290,416 ( 66,478 ) 223,938 Liftboats 243,295 ( 118,923 ) 124,372 General machinery and spares 9,394 ( 9,248 ) 146 Other (5) 11,528 ( 11,151 ) 377 $ 900,414 $ ( 367,448 ) $ 532,966 2023 Offshore support vessels: AHTS (2) $ 12,112 $ ( 4,578 ) $ 7,534 FSV (3) 340,411 ( 142,096 ) 198,315 PSV (4) 301,461 ( 53,100 ) 248,361 Liftboats 243,295 ( 103,459 ) 139,836 General machinery and spares 9,343 ( 9,161 ) 182 Other (5) 12,201 ( 11,747 ) 454 $ 918,823 $ ( 324,141 ) $ 594,682 (1) Includes property and equipment acquired in business acquisitions at acquisition date fair value and net of the impact of recognized impairment charges. Most of the Company’s vessels are pledged as collateral under the 2024 SMFH Credit Facility. (2) Anchor handling towing supply vessels (“AHTS”). (3) Fast support vessels (“FSVs”). (4) Platform support vessels (“PSVs”). (5) Includes buildings, leasehold improvements, vehicles and other property and equipment. Depreciation and amortization expense totaled $ 51.6 million, $ 53.8 million and $ 56.0 million in 2024, 2023 and 2022, respectively. Equipment maintenance and repair costs and the costs of routine overhauls, drydockings and inspections performed on vessels and equipment are charged to operating expense as incurred. Expenditures that extend the useful life or improve the marketing and commercial characteristics of equipment as well as major renewals and improvements to other properties are capitalized. Certain interest costs incurred during the construction of equipment are capitalized as part of the assets’ carrying values and are amortized over such assets’ estimated useful lives. There was no capitalized interest recognized in 2024, 2023 or 2022. Assets Held for Sale. As of December 31, 2024 , one PSV previously included in the Middle East and Asia segment, with a carrying value of $ 5.5 million, and one PSV previously included in the United States, primarily U.S. Gulf of America segment, with a carrying value of $ 5.4 million, were classified as assets held for sale as the Company expects to sell the vessels within one year. Impairment of Long-Lived Assets. The Company performs an impairment analysis of long-lived assets used in operations when indicators of impairment are present. These indicators may include a significant decrease in the market price of a long-lived asset or asset group, a significant adverse change in the extent or manner in which a long-lived asset or asset group is being used or in its physical condition, or a current period operating or cash flow loss combined with a history of operating or cash flow losses or a forecast that demonstrates continuing losses associated with the use of a long-lived asset or asset group. If the carrying values of the assets are not recoverable, as determined by their estimated future undiscounted cash flows, the estimated fair value of the assets or asset groups are compared to their current carrying values and impairment charges are recorded if the carrying value exceeds fair value. When reviewing its fleet for impairment, the Company groups vessels with similar operating and marketing characteristics, including cold-stacked vessels expected to return to active service, into vessel classes. All other vessels, including vessels retired and removed from service, are evaluated for impairment on a vessel by vessel basis. During the year ended December 31, 2024 , the Company recorded impairment charges of $ 3.7 million for other equipment designated for a construction project that was indefinitely deferred and will no longer be completed. During the year ended December 31, 2023 , the Company recorded impairment charges totaling $ 0.7 million for one leased-in AHTS to adjust for indicative future cash flows and the cost to return the vessel to its owner. During the year ended December 31, 2022, the Company recorded impairment charges totaling $ 2.9 million that consisted of $ 0.9 million for one FSV classified as held for sale and sold during 2022, $ 0.7 million for one leased-in AHTS to adjust for indicative future cash flows and the cost to return the vessel to its owner, and $ 1.3 million for other equipment classified as held for sale and sold during 2023. The impairment charges for the assets held for sale are included in gains (losses) on asset dispositions and impairments in the accompanying consolidated statements of income (loss). There were no impairments of other owned or leased-in vessels. For vessel classes and individual vessels with indicators of impairment as of December 31, 2024, the Company estimated that their future undiscounted cash flows exceeded their current carrying values. However, the Company’s estimates of future undiscounted cash flows are highly subjective as utilization and rates per day worked are uncertain, especially in light of the continued volatility in commodity prices as well as the timing and cost of reactivating cold-stacked vessels. If market conditions decline, changes in the Company’s expectations on future cash flows may result in recognizing additional impairment charges related to its long-lived assets in future periods. For any vessel or vessel class that has indicators of impairment and is deemed not recoverable through future operations, the Company determines the fair value of the vessel or vessel class. If the fair value determination is less than the carrying value of the vessel or vessel class, an impairment is recognized to reduce the carrying value to fair value. Fair value determination is primarily accomplished by obtaining independent valuations of vessel or vessel classes from qualified third party appraisers. Impairment of 50% or Less Owned Companies. Investments in 50% or less owned companies are reviewed periodically to assess whether there is an other-than-temporary decline in the carrying value of the investment. In its evaluation, the Company considers, among other items, recent and expected financial performance and returns, impairments recorded by the investee and the capital structure of the investee. When the Company determines the estimated fair value of an investment is below carrying value and the decline is other-than-temporary, the investment is written down to its estimated fair value. Actual results may vary from the Company’s estimates due to the uncertainty regarding projected financial performance, the severity and expected duration of declines in value and the available liquidity in the capital markets to support the continuing operations of the investee, among other factors. Although the Company believes its assumptions and estimates are reasonable, the investee’s actual performance compared with the estimates could produce different results and lead to additional impairment charges in future periods. No impairment charges of investments in 50% or less owned companies were incurred for the years ended December 31, 2024, 2023 and 2022 . Business Combinations. For acquisitions constituting a business acquisition, the Company recognizes 100% of the fair value of assets acquired, liabilities assumed, and noncontrolling interests when the acquisition constitutes a change in control of the acquired entity. Shares issued in consideration for a business combination, contingent consideration arrangements and pre-acquisition loss and gain contingencies are all measured and recorded at their acquisition-date fair value. Subsequent changes to fair value of contingent consideration arrangements are generally reflected in earnings. Acquisition-related transaction costs are expensed as incurred and any changes in an acquirer’s existing income tax valuation allowances and tax uncertainty accruals are recorded as an adjustment to income tax expense. The operating results of entities acquired are included in the accompanying consolidated statements of income (loss) from the date of acquisition. If an acquisition of an asset or group of assets does not meet the definition of a business, the transaction is accounted for as an asset acquisition. The assets are measured based on their cost to the Company, including transaction costs. The acquisition cost is then allocated to the assets acquired based on their relative fair values. Debt Discount and Issuance Costs . Debt discounts and costs incurred in connection with the issuance of debt are amortized over the life of the related debt using the effective interest rate method for term loans and straight-line method for revolving credit facilities and are included in interest expense in the accompanying consolidated statements of income (loss). Self-insurance Liabilities . The Company maintains marine hull, liability and war risk, general liability, workers compensation and other insurance customary in the industry in which it operates. Both the marine hull and liability policies have annual aggregate deductibles. Marine hull annual aggregate deductibles are accrued as claims are incurred while marine liability annual aggregate deductibles are accrued based on historical loss experience. Exposure to the health benefit plans are limited by maintaining stop-loss and aggregate liability coverage. To the extent that estimated self-insurance losses, including the accrual of annual aggregate deductibles, differ from actual losses realized, the Company’s insurance reserves could differ significantly and may result in either higher or lower insurance expense in future periods. Income Taxes . Deferred income tax assets and liabilities have been provided in recognition of the income tax effect attributable to the book and tax basis differences of assets and liabilities reported in the consolidated financial statements. Deferred tax assets or liabilities are provided using the enacted tax rates expected to apply to taxable income in the periods in which they are expected to be settled or realized. Interest and penalties relating to uncertain tax positions are recognized in interest expense and administrative and general, respectively, in the accompanying consolidated statements of income (loss). The Company records a valuation allowance to reduce its deferred tax assets if it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Global Intangible Low Taxed Income (“GILTI”) regime effectively imposes a minimum tax on worldwide foreign earnings and subjects U.S. shareholders of controlled foreign corporations (“CFCs”) to current taxation on certain income earned through a CFC. The Company has made the policy election to record any liability associated with GILTI in the period in which it is incurred. In the normal course of business, the Company may be subject to challenges from tax authorities regarding the amount of taxes due for the Company. These challenges may alter the timing or amount of taxable income or deductions. As part of the calculation of income tax expense, the Company determines whether the benefits of its tax positions are at least more likely than not of being sustained based on the technical merits of the tax position. For tax positions that are more likely than not of being sustained, the Company accrues the largest amount of the tax benefit that is more likely than not of being sustained. Such accruals require management to make estimates and judgments with respect to the ultimate outcome of its tax benefits and actual results could vary materially from these estimates. The Company is subject to federal and state income tax and foreign withholding tax audits from time to time that could result in proposed assessments. Management believes that the Company has appropriately accounted for income and withholding taxes for tax periods that are within the statutory period of limitations not previously audited and that are potentially open for examination by the taxing authorities. The Company cannot predict with certainty how any audits would be resolved and whether the Company will be required to make additional tax payments, which may include penalties and interest. The Company is subject to examination for the preceding eight years. Foreign Currency Translation. The assets, liabilities and results of operations of certain consolidated subsidiaries are measured using their functional currency, which is the currency of the primary foreign economic environment in which they operate. Upon consolidating these subsidiaries with the Company, their assets and liabilities are translated to U.S. dollars at currency exchange rates as of the consolidated balance sheet dates and their revenues and expenses are translated at the weighted average currency exchange rates during the applicable reporting periods. Translation adjustments resulting from the process of translating these subsidiaries’ financial statements are reported in other comprehensive income in the accompanying consolidated statements of comprehensive income (loss). Foreign Currency Transactions. Certain consolidated subsidiaries enter into transactions denominated in currencies other than their functional currency. Gains and losses resulting from changes in currency exchange rates between the functional currency and the currency in which a transaction is denominated are included in foreign currency losses, net in the accompanying consolidated statements of income (loss) in the period in which the currency exchange rates change. Accumulated Other Comprehensive (Loss) Income. The components of accumulated other comprehensive (loss) income were as follows (in thousands): SEACOR Marine Holdings Inc. Noncontrolling Interests Foreign Derivative (Losses) Gains on Cash Flow Total Foreign Derivative Other Year Ended December 31, 2021 $ 10,783 $ ( 2,728 ) $ 8,055 $ ( 1,445 ) $ ( 11 ) $ 5,265 Other comprehensive loss ( 4,451 ) 3,243 ( 1,208 ) — — ( 1,208 ) Income tax (expense) — — — — — — Year Ended December 31, 2022 6,332 515 6,847 ( 1,445 ) ( 11 ) $ ( 1,208 ) Other comprehensive income 1,245 ( 515 ) 730 — — $ 730 Income tax benefit (expense) — — — — — — Year Ended December 31, 2023 7,577 — 7,577 ( 1,445 ) ( 11 ) $ 730 Other comprehensive loss ( 436 ) — ( 436 ) — — ( 436 ) Income tax benefit (expense) — — — — — — Year Ended December 31, 2024 $ 7,141 $ — $ 7,141 $ ( 1,445 ) $ ( 11 ) $ ( 436 ) Earnings (Loss) Per Share. Basic earnings/loss per share of the common stock, par value $ 0.01 per share, of SEACOR Marine (“Common Stock”) is computed based on the weighted average number of shares of Common Stock and warrants to purchase Common Stock at an exercise price of $ 0.01 per share (“Warrants”) issued and outstanding during the relevant periods. The Warrants are included

Equipment Acquisitions and Disp

Equipment Acquisitions and Dispositions	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Equipment Acquisitions and Dispositions	2. EQUIPMENT ACQUISITIONS AND DISPOSITIONS Equipment Additions. The Company’s capital expenditures and payments on equipment were $ 7.3 million, $ 10.6 million, and $ 0.5 million in 2024, 2023 and 2022 , respectively. Deliveries of offshore support vessels for the years ended December 31 were as follows: 2024 2023 2022 FSV — 1 — PSV — — 1 — 1 1 Equipment Dispositions During the year ended December 31, 2024, the Company sold one AHTS, previously classified as held for sale, two AHTS, not previously classified as held for sale, and other equipment for net cash proceeds of $ 24.9 million, after transaction costs, and a gain of $ 17.2 million. During the year ended December 31, 2023, the Company sold one liftboat, classified as held for sale, three liftboats and one specialty vessel, previously removed from service, one FSV and other equipment, previously classified as held for sale, as well as other equipment not previously classified as such, for net cash proceeds of $ 44.7 million, after transaction costs, and a gain of $ 21.1 million. During the year ended December 31, 2022, the Company sold one FSV, one liftboat previously removed from service, office space and other equipment for net cash proceeds of $ 6.7 million, after transaction costs, and a gain of $ 2.2 million, which included impairment charges of $ 0.9 million for one FSV classified as held for sale and sold during 2022. Major equipment dispositions for the years ended December 31 were as follows: 2024 2023 2022 (1) AHTS 3 — 1 FSV — 1 1 PSV — — — Liftboats — 4 1 Specialty — 1 — 3 6 3 (1) Excludes one specialty vessel that was previously removed from service, which was sold in 2023.

Investments, at Equity, and Adv

Investments, at Equity, and Advances to 50% or Less Owned Companies	12 Months Ended
	Dec. 31, 2024
Schedule of Investments [Abstract]
Investments, at Equity, and Advances to 50% or Less Owned Companies	3. INVESTMENTS, AT EQUITY, AND ADVANCES TO 50% OR LESS OWNED COMPANIES Investments, at equity, and advances to 50% or less owned companies as of December 31 were as follows (in thousands): Ownership 2024 2023 Seabulk Angola 49.0 % 962 1,668 SEACOR Marine Arabia 45.0 % 2,508 2,385 Other 20.0 % — 50.0 % 71 72 $ 3,541 $ 4,125 Combined Condensed Financial Information of Other Investees. Summarized financial information of the Company’s other investees, at equity, as of and for the years ended December 31 was as follows (in thousands): 2024 2023 Current assets $ 29,405 $ 29,820 Noncurrent assets 110 61 Current liabilities 21,664 21,008 Noncurrent liabilities 12 — 2024 2023 2022 Operating Revenues $ 78,719 $ 68,949 $ 133,740 Costs and Expenses: Operating and administrative 69,741 61,294 90,678 Depreciation 21 27 21,434 69,762 61,321 112,112 Operating Income $ 8,957 $ 7,628 $ 21,628 Net Income $ 7,464 $ 5,239 $ 15,057 As of December 31, 2024 , cumulative undistributed net earnings of all 50% or less owned companies included in the Company’s consolidated retained earnings were $ 2.3 million. MexMar, OVH and SEACOR Marlin. On September 29, 2022, SEACOR Marine and certain of its subsidiaries, on the one hand, and Operadora de Transportes Marítimos, S.A. de C.V. (“OTM”), CME Drillship Holdings DAC (“CME Ireland”), and Offshore Vessels Holding, S.A.P.I. de C.V. (“OVH”), on the other hand, entered into a Framework Agreement (the “Framework Agreement”). OTM and CME Ireland are affiliates of Proyectos Globales de Energía y Servicios CME, S.A. de C.V. (“CME”). Alfredo Miguel Bejos is the President and Chief Executive Officer of CME and also serves as a member of SEACOR Marine’s board of directors (“Board of Directors”). Prior to the closing of the Framework Agreement Transactions (defined below), the Company owned 49 % of each of MexMar and OVH through SEACOR Marine International LLC, a wholly owned subsidiary of the Company (“SEACOR Marine International”), and the remaining 51 % ownership interests were held by OTM. The Company also owned a minority interest in SEACOR Marlin LLC (“SEACOR Marlin LLC”), the owner of the PSV SEACOR Marlin, and the remaining ownership interests of SEACOR Marlin LLC were held by MexMar. The Framework Agreement provided for, among other things, (i) the sale by SEACOR Marine LLC, a wholly owned subsidiary of the Company (“SMLLC”), of all of the outstanding equity interests of SEACOR Marine International to OTM for a purchase price of $ 66.0 million in cash, (ii) the sale of the AHTS SEACOR Davis to CME Ireland in exchange for the remaining equity interests in SEACOR Marlin LLC, such that SEACOR Marlin LLC became a wholly owned subsidiary of the Company, (iii) the transfer of a hybrid battery power system from OVH to SEACOR Marine Capital as repayment in full of a certain vessel loan agreement provided by the Company to its former joint venture, and (iv) entry into a bareboat charter agreement between SEACOR Marlin LLC and MexMar (collectively, the “Framework Agreement Transactions”). Each of the Framework Agreement Transactions was consummated on September 29, 2022. As a result of the Framework Agreement Transactions, the Company no longer owns any equity interest in either MexMar or in OVH, and the Company owns all of the equity interests in SEACOR Marlin LLC, which owns the PSV SEACOR Marlin. Accordingly, the Company does not currently operate any joint-ventured vessels, which prior to the transactions were comprised solely of the 19 offshore support vessels owned by MexMar and OVH and the one PSV owned by SEACOR Marlin LLC. The vessel owned by SEACOR Marlin LLC became wholly owned in the transaction. The Company recognized a gain on the sale of MexMar, OVH and other assets of approximately $ 0.8 million, calculated as follows: September 29, 2022 Total Cash Received $ 66,000 51% ownership in SEACOR Marlin Joint Venture 7,000 Hybrid Battery Power System 1,394 Less: Transaction Fees and other Costs 1,159 Total Net Proceeds 73,235 Less: Net Equity in MexMar and OVH Joint Ventures 65,546 Less: Net Book Value of SEACOR Davis 5,507 Less: OVH Note Receivable 1,394 Gain on Sale of MexMar, OVH and Other Assets $ 788 MexMar Management Fees. During the year ended December 31, 2022, there were no returns of capital advances or distributions to shareholders and the Company charged $ 0.2 million of vessel management fees to MexMar. SEACOR Marlin LLC. SEACOR Marlin LLC owns the PSV SEACOR Marlin. On September 13, 2018, the Company sold 51 % of SEACOR Marlin LLC to MEXMAR Offshore (MI) LLC, a wholly owned subsidiary of MexMar, for $ 8.0 million in cash, which generated a gain of $ 0.4 million. As a result of the Framework Agreement Transactions, the Company owns all of the equity interests in SEACOR Marlin LLC. The results of operations of SEACOR Marlin LLC are included in net income (loss) in the “Combined Condensed Financial Information of Other Investees” for the portion of 2022 that the entity was a 50% or less owned company. During the year ended December 31, 2022, there was a distribution to the Company of $ 1.1 million. SEACOR Marine Arabia LLC (“SEACOR Marine Arabia”) and other. The Company’s other 50% or less owned companies do not own or operate any vessels. During the years ended December 31, 2024, 2023 and 2022 , the Company received dividends of $ 2.9 million, $ 2.2 million and $ 2.0 million from these 50% or less owned companies, respectively. During the years ended December 31, 2024, 2023 and 2022 , no vessel management fees were received from these 50% or less owned companies.

Leases

Leases	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Leases	4. LEASES The Company assesses at contract inception whether a contract is, or contains, a lease, defined as a contract that conveys the right to control the use of an identified asset for a period of time in exchange for consideration. In calculating the present value of lease payments, the Company uses its incremental borrowing rate at the lease commencement date when the interest rate implicit in the lease is not readily determinable and includes the Company’s assessment and impact of any extensions, escalations or special terms. The Company applies the short-term lease recognition exemption to its short-term leases of machinery and equipment (i.e., those leases that have a lease term of 12 months or less from the commencement date and do not contain a purchase option). It also applies the lease of low-value assets recognition exemption to leases of office equipment that are considered to be low value. As of December 31, 2024, the Company leased-in certain facilities and other equipment. The leases typically contain purchase and renewal options or rights of first refusal with respect to the sale or lease of the equipment. As of December 31, 2024 , the lease terms of certain facilities and other equipment range in duration from six to 264 months. As of December 31, 2024, future minimum payments for leases for the years ended December 31 were as follows (in thousands): Operating Leases Finance Leases 2025 $ 806 $ 20 2026 474 13 2027 400 9 2028 341 — 2029 341 — Years subsequent to 2029 2,531 — 4,893 42 Interest component ( 1,305 ) ( 5 ) 3,588 37 Current portion of long-term lease liabilities 606 17 Long-term lease liabilities $ 2,982 $ 20 For the years ended December 31, the components of lease expense were as follows (in thousands): 2024 2023 Operating lease costs $ 1,216 $ 2,222 Finance lease costs: Amortization of finance lease assets (1) 44 468 Interest on finance lease liabilities (2) 3 202 Short-term lease costs 462 526 $ 1,725 $ 3,418 (1) Included in amortization costs in the consolidated statements of income (loss). (2) Included in interest expense in the consolidated statements of income (loss). For the year ended December 31, 2024, supplemental cashflow information related to leases were as follows (in thousands): 2024 Operating cash flows from operating leases $ 1,841 Financing cash outflows from finance leases 41 Right-of-use assets obtained for operating lease liabilities — Right-of-use assets obtained for finance lease liabilities 34 For the year ended December 31, 2024, other information related to leases were as follows: 2024 Weighted average remaining lease term, in years - operating leases 11.7 Weighted average remaining lease term, in years - finance leases 2.3 Weighted average discount rate - operating leases 6.2 % Weighted average discount - finance leases 10.0 % The Company recognized no impairment charges in the year ended December 31, 2024 , $ 0.7 million for one such lease in the year ended December 31, 2023 and $ 0.7 million for one such lease in the year ended December 31, 2022.

Long Term Debt

Long Term Debt	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Long Term Debt	5. LONG-TERM DEBT The Company’s long-term debt obligations as of December 31 were as follows (in thousands): 2024 2023 2024 SMFH Credit Facility (1) $ 350,000 $ — Guaranteed Notes (1) — 90,000 New Convertible Notes (1) — 35,000 2023 SMFH Credit Facility (1) — 118,950 Sea-Cat Crewzer III Term Loan Facility (1) — 14,227 SEACOR Delta Shipyard Financing (1) — 68,647 SEACOR Alpine Credit Facility (1) — 26,200 Total principal due for long-term debt 350,000 353,024 Current portion due within one year ( 27,500 ) ( 28,365 ) Unamortized debt discount ( 4,338 ) ( 32,885 ) Deferred issuance costs ( 823 ) ( 4,230 ) Long-term debt, less current portion $ 317,339 $ 287,544 (1) Proceeds from the 2024 SMFH Credit Facility, dated November 27, 2024, were used to satisfy in full the Guaranteed Notes, the New Convertible Notes, the 2023 SMFH Credit Facility, the Sea-Cat Crewzer III Term Loan Facility, the SEACOR Delta Shipyard Financing, and the SEACOR Alpine Credit Facility. See details below. The Company’s contractual long-term debt maturities for the years ended December 31 were as follows (in thousands): 2025 $ 27,500 2026 30,000 2027 30,000 2028 30,000 2029 232,500 Years subsequent to 2029 — $ 350,000 As of December 31, 2024, the Company was in compliance with all debt covenants and lender requirements. 2024 SMFH Credit Facility. On November 27, 2024, SEACOR Marine, as parent guarantor, SEACOR Marine Foreign Holdings Inc. (“SMFH”), as borrower, and certain other wholly-owned subsidiaries of SEACOR Marine, as subsidiary guarantors, entered into a credit agreement providing for a senior secured term loan of up to $ 391.0 million (the “2024 SMFH Credit Facility” and such agreement, the “2024 SMFH Credit Agreement”) with an affiliate of EnTrust Global, as lender, Kroll Agency Services Limited, as facility agent, and Kroll Trustee Services Limited, as security trustee. The 2024 SMFH Credit Facility is divided into two tranches, Tranche A in an amount of up to $ 350.0 million and Tranche B in an amount of up to $ 41.0 million. The proceeds from Tranche A of the 2024 SMFH Credit Facility were used to: (x) refinance $ 328.7 million of existing principal indebtedness comprised of: (a) $ 90.0 million incurred under the Guaranteed Notes (as defined below), (b) $ 35.0 million incurred the New Convertible Notes (as defined below), (c) $ 109.8 million incurred under the 2023 SMFH Credit Facility (as defined below), (d) $ 11.8 million incurred under the Sea-Cat Crewzer III Loan Facility (as defined below) (e) $ 60.3 million incurred under the SEACOR Delta Shipyard Financing (as defined below), and (f) $ 21.8 million incurred under the SEACOR Alpine Credit Facility (as defined below), and (y) satisfy accrued and unpaid interest and fees, and for general corporate purposes. The funds available under Tranche A of the 2024 SMFH Credit Facility were fully drawn by December 17, 2024. The proceeds from Tranche B of the 2024 SMFH Credit Facility may be used to make a portion of the payments to Fujian Mawei Shipbuilding, Ltd. with respect to the shipbuilding contracts for the construction of two PSVs for a contract price of $ 41.0 million per vessel. The PSVs are each 4,650 tons deadweight with a 1,000 square meter deck area and equipped with medium speed diesel engines and an integrated battery energy storage system for higher fuel efficiency and lower running costs. The PSVs are expected to be delivered in the fourth quarter of 2026 and the first quarter of 2027, respectively. Up to $ 20.5 million of the commitments available under Tranche B of the 2024 SMFH Credit Facility may be used for payments under each PSV’s respective shipbuilding contract, for a total of $ 41.0 million of commitments available to put towards the cost of both PSVs. The commitments under Tranche B of the 2024 SMFH Credit Facility are available to be drawn until the earlier of delivery of each PSV and March 31, 2027. The 2024 SMFH Credit Facility matures on the fifth anniversary of the date of initial funding (the “Maturity Date”), with quarterly amortization payments of (i) $ 5.0 million on March 31, 2025 and $ 7.5 million on each quarter thereafter with respect to Tranche A of the 2024 SMFH Credit Facility and (ii) beginning March 31, 2027, 2.13 % of the principal amount outstanding under Tranche B of the 2024 SMFH Credit Facility, in each case with the remaining outstanding principal amount due on the Maturity Date. Principal amounts drawn under the 2024 SMFH Credit Facility bear interest at a fixed rate of 10.30 % per annum. In addition, undrawn amounts committed under the 2024 SMFH Credit Facility bear a commitment fee of 3.00 % per annum until such commitments are drawn or cancelled. The loan may be prepaid at any time in amounts of $ 1.0 million or greater, subject to: (a) prior to the 12-month anniversary of funding, a premium equal to the remaining unpaid interest due over the first 15-months of the loan, and (b) after the 12-month anniversary of funding and prior to the 30-month anniversary of funding, a premium decreasing over time from 2.50 % to 1.00 %. The 2024 SMFH Credit Facility contains customary covenants for financings of this type including financial maintenance and restrictive covenants, such as the aggregate collateral vessel value to the sum of the outstanding principal amounts of the loans. The 2024 SMFH Credit Facility restricts the payment of dividends and distributions and the ability of SMFH to make certain investments, subject to important exceptions. In addition, the 2024 SMFH Credit Facility includes customary events of default. In connection with the 2024 SMFH Credit Facility, SEACOR Marine issued a guaranty with respect to the obligations of SMFH under the 2024 SMFH Credit Agreement and related documents (the “2024 SMFH Credit Facility Guaranty”). The 2024 SMFH Credit Facility Guaranty includes, among other customary covenants, various financial covenants, including (A) minimum Cash and Cash Equivalents (as defined in the 2024 SMFH Credit Facility) of the higher of $ 20.0 million and 7.5 % of Net Interest-Bearing Debt (as defined in the 2024 SMFH Credit Agreement), (B) minimum Equity Ratio (as defined in the 2024 SMFH Credit Agreement) of 30 % prior to and including the period ending December 31, 2026, and 35 % thereafter, (C) maximum Debt-to-Capitalization Ratio (as defined in the 2024 SMFH Credit Agreement) of 65 %. The 2024 SMFH Credit Facility Guaranty also restricts the payment of dividends and distributions. During the year ended December 31, 2024, the Company recognized a loss on debt extinguishment of $ 31.9 million calculated as follows (in thousands): Unamortized Debt Discount: Guaranteed Notes $ 5,599 New Convertible Notes 2,340 2023 SMFH Credit Facility 1,550 SEACOR Delta Shipyard Financing 15,654 25,143 Deferred Issuance Costs: Guaranteed Notes 760 New Convertible Notes 287 2023 SMFH Credit Facility 512 Sea-Cat Crewzer III Term Loan Facility 1,058 SEACOR Alpine Credit Facility 492 3,109 Debt Prepayment Fees: 2023 SMFH Credit Facility 3,294 Sea-Cat Crewzer III Term Loan Facility 42 SEACOR Alpine Credit Facility 218 3,554 Third Party Fees 117 Loss on Debt Extinguishment $ 31,923 The Carlyle Notes. On October 5, 2022, SEACOR Marine and certain funds affiliated with The Carlyle Group Inc. (“Carlyle” and such funds, the “Carlyle Investors”) entered into two agreements pursuant to which SEACOR Marine issued the Carlyle Investors (i) $ 90.0 million in aggregate principal amount of SEACOR Marine’s 8.0 % / 9.5 % Senior PIK Toggle Notes due 2026 (the “Guaranteed Notes”) and (ii) $ 35.0 million aggregate principal amount of SEACOR Marine’s 4.25 % Convertible Senior Notes due 2026 (the “New Convertible Notes”) in exchange for all $ 175.0 million in aggregate principal amount of SEACOR Marine’s convertible senior notes due 2023 (the “Old Convertible Notes”) (and such exchange, the “Exchange Transactions”). During the year ended December 31, 2022, the Company recognized contractual interest expense of $ 4.0 million and amortization of debt discount and issuance costs of $ 4.0 million, for total interest expense of $ 8.0 million with respect to the Old Convertible Notes. Guaranteed Notes. The Guaranteed Notes were issued pursuant to the Exchange Agreement (Guaranteed Notes) among SEACOR Marine, as issuer, Falcon Global Robert LLC, a wholly owned subsidiary of the Company (“FG Robert”), as the guarantor, and the Carlyle Investors (the “Guaranteed Notes Exchange Agreement”). Pursuant to the Guaranteed Notes Exchange Agreement, SEACOR Marine had the right to pay interest on the Guaranteed Notes (i) in cash at a rate of 8.0 % per annum or (ii) partly in cash and partly in-kind by increasing the principal amount of the Guaranteed Notes or issuing additional Guaranteed Notes at a rate of 9.5 % per annum (“Hybrid Interest”) with the cash portion of the Hybrid Interest bearing interest at a rate of 4.25 % per annum and in the in-kind portion of the Hybrid Interest bearing interest at a rate of 5.25 % per annum. The Guaranteed Notes were guaranteed on a senior unsecured basis by FG Robert, the owner of the LB Robert liftboat. The Guaranteed Notes would have matured on July 1, 2026 but proceeds from the 2024 SMFH Credit Facility were used to satisfy in full the Guaranteed Notes. New Convertible Notes. The New Convertible Notes were issued pursuant to the Exchange Agreement (Convertible Notes) among SEACOR Marine, as issuer, and the Carlyle Investors (the “Convertible Notes Exchange Agreement”). The New Convertible Notes bore interest at a rate of 4.25 % per annum payable semi-annually in arrears. The New Convertible Notes were convertible into shares of Common Stock at the option of the holders at a conversion rate of 85.1064 shares per $ 1,000 in principal amount of New Convertible Notes (equivalent to a “Conversion Price” of $ 11.75 ) or into warrants to purchase an equal number of shares of Common Stock at an exercise price of $ 0.01 per share in order to facilitate SEACOR Marine’s compliance with the provisions of the Jones Act. In addition, SEACOR Marine had the right to cause the mandatory conversion of the New Convertible Notes into Common Stock if the daily volume-weighted average price (“VWAP”) of the Common Stock equals or exceeds (A) in the case of New Convertible Notes held by affiliates of Carlyle, 150 % of the Conversion Price and (B) in the case of New Convertible Notes held by any Person other than affiliates of Carlyle, 115 % of the Conversion Price, in each case for each of the 20 consecutive trading days. Proceeds from the 2024 SMFH Credit Facility were used to satisfy in full the New Convertible Notes. The conversion option of the New Convertible Notes qualified as an exception from the derivative accounting treatment under Accounting Standards Codification 815. Accordingly, the conversion option was not bifurcated and the debt was recorded at fair value. The adjusted unamortized debt discount and issuance costs are being amortized as additional non-cash interest expense over the remaining term of the New Convertible Notes for an overall effective interest rate of 9.46 %. During the year ended December 31, 2024, the Company recognized contractual interest expense of $ 2.9 million and amortization of debt discount and issuance costs of $ 1.5 million, for total interest expense of $ 4.4 million. As of December 31, 2023, the unamortized discount and issuance costs were $ 3.7 million and $ 0.4 million, respectively, for a total net carrying amount of $ 30.9 million. In addition, during the year ended December 31, 2023, the Company recognized contractual interest expense of $ 2.9 million and amortization of debt discount and issuance costs of $ 1.4 million, for total interest expense of $ 4.3 million. As of December 31, 2022, the unamortized discount and issuance costs were $ 4.9 million and $ 0.6 million, respectively, for a total net carrying amount of $ 29.5 million. In addition, during the year ended December 31, 2022, the Company recognized contractual interest expense of $ 0.7 million and amortization of debt discount and issuance costs of $ 0.3 million, for total interest expense of $ 1.0 million. The New Convertible Notes would have matured on July 1, 2026 but proceeds from the 2024 SMFH Credit Facility were used to satisfy in full the New Convertible Notes. 2023 SMFH Credit Facility. On September 8, 2023, SEACOR Marine, as parent guarantor, SMFH, as borrower, and certain other wholly owned subsidiaries of SEACOR Marine, as subsidiary guarantors, entered into a credit agreement providing for a $ 122.0 million senior secured term loan (the “2023 SMFH Credit Facility”) with certain affiliates of EnTrust Global, as lenders, Kroll Agency Services, Limited, as facility agent, and Kroll Trustee Services Limited, as security trustee for the purposes of creating a more rational and efficient capital structure for the Company by consolidating a number of different credit facilities with different lending groups into a single facility. The proceeds of the 2023 SMFH Credit Facility were used to: (x) refinance $ 104.8 million of existing principal indebtedness under five separate credit facilities, (y) acquire 100 % ownership of the Amy Clemons McCall, a 2014 built FSV, previously operated under lease and pledged as collateral under the 2023 SMFH Credit Facility, and (z) satisfy accrued and unpaid interest, fees, and general corporate purposes. The 2023 SMFH Credit Facility had quarterly amortization of 2.5 % of the initial loan advanced thereunder, with the remaining outstanding principal amount due on the maturity date, and bore interest at a fixed rate of 11.75 % per annum. The 2023 SMFH Credit Facility would have matured on September 14, 2028 but proceeds from the 2024 SMFH Credit Facility were used to satisfy in full the 2023 SMFH Credit Facility. During the year ended December 31, 2023, the Company expensed $ 1.8 million of payments for early terminations fees and $ 0.2 million of unamortized debt issuance costs related to the debt extinguishment. Sea-Cat Crewzer III Term Loan Facility. On April 21, 2016, Sea-Cat Crewzer III LLC, a wholly owned subsidiary of the Company (“Sea-Cat Crewzer III”) entered into a € 27.6 million term loan facility (payable in U.S. dollars) secured by the vessels owned by Sea-Cat Crewzer III and fully guaranteed by SEACOR Marine (as amended, the “Sea-Cat Crewzer III Loan Facility”). Borrowings under the facility bore interest at a commercial interest reference rate of 2.76 % per annum. Proceeds from the 2024 SMFH Credit Facility were used to satisfy in full the Sea-Cat Crewzer III Term Loan Facility. SEACOR Delta Shipyard Financing. Eight PSVs built by COSCO Shipping Heavy Industry (Guangdong) Co., Ltd. (the “COSCO (Guangdong) Shipyard” and such PSVs, the “SEACOR Delta PSVs”) were acquired by vessel owning subsidiaries (“SEACOR Delta SPVs”) of SEACOR Offshore Delta LLC, a wholly owned subsidiary of the Company and formerly known as SEACOSCO Offshore LLC, pursuant to deferred purchase agreements with COSCO (Guangdong) Shipyard (the “SEACOR Delta Shipyard Financing”). The SEACOR Delta Shipyard Financing provided for amortization of the purchase price for each SEACOR Delta PSV over a period of 10 years from delivery bearing a floating annual interest rate of three-month LIBOR, later amended to Term SOFR, plus 4.0 % . SEACOR Offshore Delta LLC has taken delivery of all eight SEACOR Delta PSVs, seven with a 2018 or 2019 year of build, and one with a 2020 year of build. The payment obligations of the SEACOR Delta SPVs under the SEACOR Delta Shipyard Financing for each vessel were secured by a first lien mortgage on the vessel and a pledge of the SEACOR Delta SPV’s equity, and SEACOR Marine provided a limited deficiency guarantee solely with respect to the shortfall in vessel collateral value, if any, in the event the COSCO (Guangdong) Shipyard exercises its remedies under the mortgages. Proceeds from the 2024 SMFH Credit Facility were used to satisfy in full the SEACOR Delta Shipyard Financing. SEACOR Alpine Credit Facility. On June 16, 2023, SEACOR Alps LLC (“SEACOR Alps”), SEACOR Andes LLC (“SEACOR Andes”), and SEACOR Atlas LLC (“SEACOR Atlas” and, together with SEACOR Alps and SEACOR Andes, the “SEACOR Alpine Borrowers”), each a wholly owned subsidiary of the Company, as borrowers, entered into a $ 28.0 million senior secured term loan facility, by and among the SEACOR Alpine Borrowers, SEACOR Marine, as a guarantor, SEACOR Marine Alpine LLC, a wholly owned subsidiary of the Company, and Mountain Supply LLC, an affiliate of Hudson Structured Capital Management, as lender, facility agent and security trustee (the “SEACOR Alpine Credit Facility”). The proceeds of the SEACOR Alpine Credit Facility were used to satisfy in full amounts outstanding under certain shipyard financing provided by COSCO Shipping Heavy Industry (Zhoushan) Co. The principal amount of each of the three tranches of the SEACOR Alpine Credit Facility had monthly installments of (i) $100,000 for the first eight ( 8 ) installments, (ii) $ 140,000 for the following twenty-four ( 24 ) installments, and (iii) $ 100,000 for each installment thereafter and bore interest at a fixed rate of 10.25 % per annum. The SEACOR Alpine Credit Facility would have matured on June 27, 2028 but proceeds from the 2024 SMFH Credit Facility were used to satisfy in full the SEACOR Alpine Credit Facility. Letters of Credit. As of December 31, 2024 , the Company had outstanding letters of credit totaling $ 0.4 million securing lease obligations, labor and performance guarantees.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Income Taxes	6. INCOME TAXES Loss before income tax (benefit) expense and equity in earnings of 50 % or less owned companies derived from U.S. and foreign companies for the years ended December 31 were as follows (in thousands): 2024 2023 2022 United States $ ( 67,632 ) $ ( 3,576 ) $ ( 48,037 ) Foreign ( 15,255 ) ( 335 ) ( 21,881 ) Eliminations ( 160 ) ( 160 ) ( 160 ) $ ( 83,047 ) $ ( 4,071 ) $ ( 70,078 ) The components of income tax (benefit) expense for the years ended December 31 were as follows (in thousands): 2024 2023 2022 Current: Federal $ — $ ( 18 ) $ 90 State ( 44 ) 47 ( 78 ) Foreign 11,111 13,831 8,473 11,067 13,860 8,485 Deferred: Federal ( 13,629 ) ( 5,062 ) 7 State ( 53 ) 8 90 Foreign — ( 7 ) — ( 13,682 ) ( 5,061 ) 97 $ ( 2,615 ) $ 8,799 $ 8,582 In October 2024, the Company received a tax assessment from the General Tax Authority in Qatar for $ 0.6 million relating to tax returns for the years 2018 through 2023 for which the Company is filing an appeal. The following table reconciles the difference between the statutory federal income tax rate for the Company and the effective income tax rate for the years ended December 31: 2024 2023 2022 Statutory rate ( 21.0 )% ( 21.0 )% ( 21.0 )% Income (loss) of foreign subsidiaries not includable in U.S. return and foreign withholding tax 15.9 % 223.4 % 20.8 % Non-Deductible Expenses 0.1 % 1.2 % 0.3 % JV equity earnings — % — % — % Sale of investments in 50 % or less owned companies — % — % 11.1 % 162(m) - Executive compensation 1.8 % 17.8 % — % Return to provision — % — % — % State Taxes ( 0.1 )% 1.1 % — % Subpart F Income and GILTI 1.3 % 6.6 % 0.7 % Share Award Plans ( 1.1 )% ( 12.9 )% 0.3 % Other — % — % 0.1 % Effective Tax Rate ( 3.1 )% 216.2 % 12.3 % For the year ending December 31, 2024 , the Company’s effective income tax rate of ( 3.1 )% was primarily due to foreign taxes paid that are not creditable against U.S. income taxes and foreign losses for which there is no benefit in the U.S. for income tax purposes. For the year ending December 31, 2023, the Company’s effective income tax rate of 216.2 % was primarily due to foreign withholding taxes. For the year ending December 31, 2022, the Company’s effective income tax rate of 12.3 % was primarily due to foreign taxes paid that are not creditable against U.S. income taxes, foreign losses for which there is no benefit in the U.S. for income tax purposes and the sale of investments in 50 % or less owned companies. The components of net deferred income tax liabilities as of December 31 were as follows (in thousands): 2024 2023 Deferred tax liabilities: Property and equipment $ 43,732 $ 48,779 Other 684 3,533 Total deferred tax liabilities 44,416 52,312 Deferred tax assets: Federal net operating loss carryforwards 16,501 10,887 Foreign tax credits 4,283 4,282 Deferred state taxes 1,934 1,894 Other 4,573 4,456 27,291 21,519 Valuation allowance ( 4,912 ) ( 4,925 ) Total deferred tax assets 22,379 16,594 Net deferred tax liabilities $ 22,037 $ 35,718 The Section 163(j) interest deduction limitations were amended to limit the ability of the Company to deduct net interest expense to 30 % of adjusted taxable income. For the year ended December 31, 2024, $ 1.2 million of interest expense was suspended and will carry forward. For the year ended December 31, 2023, $ 1.8 million of previously suspended interest was deductible. Net operating losses generated in 2017 and prior may be carried forward 20 years (expiring in 2037 ). Future utilization of net operating losses (“NOL”) arising in tax years after December 31, 2017 are limited to 80 % of taxable income and are allowed to be carried forward indefinitely. As of December 31, 2024, the Company has $ 78.6 million of net operating losses generated after 2017. As of December 31, 2023, the Company had utilized all of its remaining net operating losses generated prior to December 31, 2017. As of December 31, 2024 and 2023, the Company's valuation allowance of $ 4.9 million consists of $ 4.3 million of foreign tax credit carryforwards which the Company expects to expire unutilized and $ 0.6 million of Louisiana state net operating loss carryforwards.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Strategies	12 Months Ended
	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Strategies	7. DERIVATIVE INSTRUMENTS AND HEDGING STRATEGIES Derivative instruments are classified as either assets, which are included in other receivables in the accompanying consolidated balance sheets, or liabilities based on their individual fair values. The fair values of the Company’s derivative instruments as of December 31 were as follows (in thousands): 2024 2023 Derivative Derivative Derivative Derivative Derivatives not designated as hedging instruments: Forward Exchange Contract $ — $ 464 $ 608 $ — Economic Hedges. The Company may enter and settle forward currency exchange, option and future contracts with respect to various foreign currencies. These contracts enable the Company to buy currencies in the future at fixed exchange rates, which could offset possible consequences of changes in currency exchange rates with respect to the Company’s business conducted outside of the U.S. The Company generally does not enter into contracts with forward settlement dates beyond 12 to 18 months. During the fourth quarter of 2023, the Company entered into a forward exchange contract related to the purchase of hybrid battery power systems, the purchase price for which is denominated in Norwegian Kroner. During the years ended December 31, 2024 and December 31, 2023, the Company recognized losses of $ 0.9 million and gains of $ 0.6 million, respectively, on these contracts which were recognized in earnings. Cash Flow Hedges. The Company may from time to time enter into interest rate swap agreements designated as cash flow hedges. By entering into interest rate swap agreements, the Company can convert the variable interest component (if any) of outstanding borrowings to a fixed interest rate. As of December 31, 2024, there were no interest rate swaps held by the Company. The Company recognized losses on derivative instruments designated as cash flow hedges of $ 0.5 million for the year ended December 31, 2023 and gains of $ 2.3 million for the year ended December 31, 2022 as a component of other comprehensive income (loss). Derivative Instruments. The Company utilizes derivative instruments to manage the volatility of cash flows due to fluctuating interest rates. All derivative instruments not qualifying for the normal purchase and normal sale exception are recorded on the balance sheets at fair value. The treatment of the periodic changes in fair value will depend on whether the derivative is designated and effective as a hedge for accounting purposes. If a derivative qualifies for hedge accounting and is designated as a cash flow hedge, the effective portion of the change in fair value of the derivative is deferred in Accumulated Other Comprehensive Income (“AOCI”), a component of owners’ equity, and reclassified to earnings when the forecasted transaction occurs. Cash flows from a derivative instrument designated as a hedge are classified in the same category as the cash flows from the item being hedged. As such, we include the cash flows from interest rate derivative instruments in interest expense. If a derivative does not qualify as a hedge or is not designated as a hedge, the gain or loss resulting from the change in fair value on the derivative is recognized currently in earnings as a component of other income (expense). We formally document all relationships between hedging instruments and hedged items, as well as its risk management objectives and strategy for undertaking the hedge. This documentation includes the specific identification of the hedging instrument and the hedged item, the nature of the risk being hedged and the manner in which the hedging instrument’s effectiveness will be assessed. At the inception of the hedge, and on an ongoing basis, we assess whether the derivatives used in hedging transactions are highly effective in offsetting changes in cash flows of hedged items. The relationship between the hedging instrument and the hedged item must be highly effective in achieving the offset of changes in cash flows attributable to the hedged risk both at the inception of the contract and on an ongoing basis. We measure hedge ineffectiveness on a quarterly basis and reclassify any ineffective portion of the gain or loss related to the change in fair value to earnings in the current period. We will discontinue hedge accounting on a prospective basis when a hedge instrument is terminated or ceases to be highly effective. Gains and losses deferred in AOCI related to cash flow hedges for which hedge accounting has been discontinued remain deferred until the forecasted transaction occurs. If it is no longer probable that a hedged forecasted transaction will occur, deferred gains or losses on the hedging instrument are reclassified to earnings immediately. For balance sheet classification purposes, we analyze the fair values of the derivative instruments on a contract-by-contract basis and report the related fair values and any related collateral by counterparty on a gross basis. Realized and unrealized gains and losses on derivatives designated as cash flow hedges that are entered into by the Company’s 50% or less owned companies are also reported as a component of the Company’s other comprehensive loss in proportion to the Company’s ownership percentage, with reclassifications and ineffective portions being included in equity in earnings (losses) of 50% or less owned companies, net of tax, in the accompanying consolidated statements of income (loss). The fair value of our derivative instruments, depending on the type of instrument, is determined by the use of present value methods or standard option valuation models with assumptions about commodity prices based on those observed in underlying markets. The estimated fair value is net of an adjustment for credit risk based on the default probabilities by year as indicated by market quotes for the counterparties’ credit default swap rates. The following tables reflect amounts recorded in Other Comprehensive Income (Loss) (“OCI”) and amounts reclassified from OCI to revenue and expense for the periods indicated: Gains (Losses) Recognized in OCI on Derivatives Derivatives in Cash Flow Hedging Relationships 2024 2023 2022 Interest rate swap contracts $ — $ 56 $ 1,608 Joint venture interest rate swap contracts — — 941 (Gains) Losses Reclassified from OCI into Income Location of (Gains) Losses 2024 2023 2022 Interest expense $ — $ ( 571 ) $ 694 Our consolidated earnings are also affected by the use of the mark-to-market method of accounting for derivative instruments that do not qualify for hedge accounting or that have not been designated as hedges. The changes in fair value of these instruments are recorded on the balance sheet and through earnings rather than being deferred until the anticipated transaction settles. The use of mark-to-market accounting for financial instruments can cause non-cash earnings volatility due to changes in the underlying commodity price indices. Other Derivative Instruments. The Company had no derivative instruments not designated as hedging instruments for the year ended December 31, 2022 and recognized (losses) gains on derivative instruments not designated as hedging instruments for the years ended December 31, 2024 and 2023 as follows (in thousands): Derivative gains (losses), net 2024 2023 2022 Forward currency exchange, option and future contracts $ ( 908 ) $ 608 $ — The forward currency exchange contract relates to the purchase of hybrid battery power systems.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Fair Value Measurements	8. FAIR VALUE MEASUREMENTS The fair value of an asset or liability is the price that would be received to sell an asset or transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company utilizes a fair value hierarchy that maximizes the use of observable inputs and minimizes the use of unobservable inputs when measuring fair value and defines three levels of inputs that may be used to measure fair value. Level 1 inputs are quoted prices in active markets for identical assets or liabilities. Level 2 inputs are observable inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly, including quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are not active, inputs other than quoted prices that are observable for the asset or liability, or inputs derived from observable market data. Level 3 inputs are unobservable inputs that are supported by little or no market activity and are significant to the fair value of the assets or liabilities. The Company’s financial assets and liabilities as of December 31 that are measured at fair value on a recurring basis were as follows (in thousands): Level 1 Level 2 Level 3 2024 LIABILITIES Derivative instruments $ — $ 464 $ — 2023 ASSETS Derivative instruments $ — $ 608 $ — The fair value of the Company’s derivative instruments was estimated by utilizing a spot rate as of the measurement date provided by an independent third party. The estimated fair values of the Company’s other financial assets and liabilities as of December 31 were as follows (in thousands): Estimated Fair Value Carrying Level 1 Level 2 Level 3 2024 LIABILITIES Long-term debt, including current portion 344,839 — 345,662 — 2023 LIABILITIES Long-term debt, including current portion 315,909 — 307,653 — The carrying value of cash, cash equivalents, restricted cash and trade receivables approximates fair value. The fair value of the Company’s long-term debt was estimated based upon quoted market prices or by using discounted cash flow analysis based on estimated current rates for similar types of arrangements. Considerable judgment was required in developing certain of the estimates of fair value and, accordingly, the estimates presented herein are not necessarily indicative of the amounts that the Company could realize in a current market exchange. Property and equipment. During the year ended December 31, 2024, the Company recognized impairment charges of $ 3.7 million for other equipment designated for a construction project that was indefinitely deferred and will no longer be completed. During the year ended December 31, 2023, the Company recognized impairment charges of $ 0.7 million for one leased-in AHTS to adjust for indicative cash flows and the cost to return the vessel to its owner. The impairment charges for the assets held for sale are included in gains (losses) on asset dispositions and impairments in the accompanying consolidated statements of income (loss). Investments, at equity, in 50% or less owned companies. During the year ended December 31, 2024, the Company did not make any adjustments to any of its investments in 50% or less owned companies.

Warrants

Warrants	12 Months Ended
	Dec. 31, 2024
Warrants and Rights Note Disclosure [Abstract]
Warrants	9. WARRANTS In connection with various transactions, the Company issued an aggregate of 2,560,456 warrants to purchase shares of Common Stock at an exercise price of $ 0.01 per share (“Warrants”). As of December 31, 2024, 1,280,195 Warrants remain outstanding, which are comprised entirely of warrants issued to and held by the Carlyle Investors. On November 13, 2024, 24,138 Warrants were exercised for a penny per share. In connection with the exercise of Warrants on November 13, 2024, 39 shares of Common Stock were withheld as payment for the exercise price of the exercised Warrants. On November 9, 2023, 17,635 Warrants were exercised for a penny per share. In connection with the exercise of Warrants on November 9, 2023, 16 shares of Common Stock were withheld as payment for the exercise price of the exercised Warrants. On January 17, 2023, 117,515 Warrants were exercised. In connection with the exercise of Warrants on January 17, 2023, 121 shares of Common Stock were withheld as payment for the exercise price of the exercised Warrants.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2024
Equity [Abstract]
Stockholders' Equity	10. STOCKHOLDERS' EQUITY On November 13, 2024, 24,138 Warrants were exercised, resulting in 1,280,195 Warrants outstanding as of December 31, 2024, which are comprised entirely of warrants issued to the Carlyle Investors. In connection with the exercise of Warrants on November 13, 2024, 39 shares of Common Stock were withheld as payment for the exercise price of the exercised Warrants. On January 17, 2023, 117,515 Warrants were exercised for a penny per share. In connection with the exercise of Warrants on January 17, 2023, 121 shares of Common Stock were withheld as payment for the exercise price of the exercised Warrants. On November 9, 2023, 17,635 Warrants were exercised for a penny per share, which are comprised entirely of warrants issued to the Carlyle Investors. In connection with the exercise of Warrants on November 9, 2023, 16 shares of Common Stock were withheld as payment for the exercise price of the exercised Warrants. On November 1, 2023, SEACOR Marine entered into an at-the-market sales agreement (the “Prior Sales Agreement”) with B. Riley Securities, Inc. (the “Sales Agent”), relating to the issuance and sale from time to time by SEACOR Marine (the “Prior ATM Program”), as principal or through the Sales Agent, of shares of Common Stock having an aggregate gross sales price of up to $ 25.0 million (the “ATM Shares”). On February 7, 2025, SEACOR Marine entered into an at-the-market sales agreement (the “Sales Agreement”) with the Sales Agent, relating to the issuance and sale from time to time by SEACOR Marine, as principal or through the Sales Agent of the ATM Shares. The Prior Sales Agreement was terminated, effective upon the execution of the Sales Agreement. The sale of the ATM Shares if any, under the Sales Agreement may be made in ordinary brokers’ transactions, to or through a market maker, on or through the New York Stock Exchange (the “NYSE”), the existing trading market for the Common Stock, or any other market venue where the Common Stock may be traded, in the over-the-counter market, in privately negotiated transactions, or through a combination of any such methods of sale. The Sales Agent may also sell the ATM Shares by any other method permitted by law. During the fourth quarter of 2023, the Company issued and sold 7,674 shares of Common Stock pursuant to the Prior ATM Program at an average price of $ 13.1891 per share, with net proceeds to the Company of $ 23,590 , net of costs directly attributable to such issuance and sale of $ 77,623 . No other shares of Common Stock were sold in 2023 or 2024 under the Prior ATM Program.

Noncontrolling Interests in Sub

Noncontrolling Interests in Subsidiaries	12 Months Ended
	Dec. 31, 2024
Noncontrolling Interest [Abstract]
Noncontrolling Interests in Subsidiaries	11. NONCONTROLLING INTERESTS IN SUBSIDIARIES Noncontrolling interests in the Company’s consolidated subsidiaries as of December 31 were as follows (in thousands): Noncontrolling 2024 2023 VEESEA Holdings Inc. 1.8 % $ 321 $ 321

Savings and Multi-employer Pens

Savings and Multi-employer Pension Plans	12 Months Ended
	Dec. 31, 2024
Retirement Benefits [Abstract]
Savings and Multi-employer Pension Plans	12. SAVINGS AND MULTI-EMPLOYER PENSION PLANS SEACOR Marine Savings Plan. Effective January 1, 2022, the Company increased its matching contributions to the “SEACOR Marine 401(k) Plan,” a Company sponsored defined contribution plan (the “Savings Plan”) from 2 % to 3 % of an employee’s wages, and effective July 1, 2022 the Company increased such contribution to 4 %. The Savings Plan costs for the years ended December 31, 2024, 2023 and 2022 were $ 1.1 million, $ 1.1 million and $ 0.8 million, respectively. MNOPF and MNRPF. Certain of the Company’s subsidiaries are participating employers in two industry-wide, multi-employer, defined benefit pension funds in the United Kingdom (“U.K.”): the U.K Merchant Navy Officers Pension Fund (“MNOPF”) and the U.K. Merchant Navy Ratings Pension Fund (“MNRPF”). The Company’s participation in the MNOPF began with the acquisition of the Stirling group of companies (the “Stirling Group”) in 2001 and relates to certain officers employed between 1978 and 2002 by the Stirling Group and/or its predecessors. The Company’s participation in the MNRPF also began with the acquisition of the Stirling Group in 2001 and relates to ratings employed by the Stirling Group and/or its predecessors through today. Both of these plans are in deficit positions and, depending upon the results of future actuarial valuations, it is possible that the plans could experience funding deficits that will require the Company to recognize payroll related operating expenses in the periods invoices are received. As of December 31, 2024, all invoices received related to MNOPF and MNRPF have been settled in full. On July 5, 2024, the Company was informed by the MNRPF $ 0.4 million (£ 0.3 million) of the cumulative funding deficit of the MNRPF was allocated to the Company as a participating employer, for which the Company paid in full in October 2024. On November 6, 2024, the Company was informed by the MNOPF that no further contributions from participating employers were required based on the results of the 2024 valuation. Other Plans. Certain employees participate in other defined contribution plans in various international regions. During the years ended December 31, 2024, 2023 and 2022 , the Company incurred costs, primarily from employer matching contributions of $ 0.3 million, $ 0.7 million and $ 0.3 million, respectively.

Stock Based Compensation

Stock Based Compensation	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Stock Based Compensation	13. STOCK BASED COMPENSATION Equity Incentive Plan. During 2017, the Company adopted the SEACOR Marine Holdings Inc. 2017 Equity Incentive Plan (the “2017 Plan”) and at the annual meeting of shareholders held on June 9, 2020, the Company’s shareholders approved the SEACOR Marine Holdings Inc. 2020 Equity Incentive Plan (the “2020 Plan”). At the annual meeting of shareholders held on June 7, 2022 (the “Approval Date”), the Company’s shareholders approved the SEACOR Marine Holdings Inc. 2022 Equity Incentive Plan (the “2022 Plan”), which authorized the issuance of 2,450,000 shares of Common Stock under the 2022 Plan plus 6,005 shares of Common Stock remaining available for issuance under the 2020 Plan as of the Approval Date that will be available for issuance under the 2022 Plan. The types of awards under the 2022 Plan may include stock options, stock appreciation rights, restricted stock and restricted stock units, performance awards and other stock-based awards. As of December 31, 2024 , 1,005,288 shares of Common Stock remained available for issuance under the 2022 Plan. Restricted stock typically vests from one to three years after the date of grant, and stock options to purchase shares of Common Stock typically vest and become exercisable from one to three years after date of grant and expire no later than the tenth anniversary of the date of grant for both employees and directors. Performance restricted stock units (“PRSUs”) typically vest on a cliff-basis after three years , subject to certain stock price performance goals. Pursuant to the applicable award agreements, restricted stock and stock options vest subject to the participant’s continued employment with the Company on the applicable vesting date, subject to accelerated vested upon the executive’s death or qualified retirement or, with respect to restricted stock, upon termination by the Company without “cause” (including for disability). Upon any such termination, PRSUs that have been earned with respect to the stock price performance goal(s) will be settled on the third anniversary of the grant date, without regard to the participants employment with the Company as of such date. For options granted, the fair value is estimated on the date of the grant using the Black-Scholes option pricing model with the following assumptions: (a) no dividend yield; (b) weighted average expected volatility; (c) weighted average discount rate; and (d) expected life. The fair value of restricted stock, earned PRSUs and stock options issued to employees and directors, as applicable, is recognized as compensation expense over the period of service that generally coincides with the vesting period of the award. For all award types, forfeitures are recognized as incurred. Distribution of SEACOR Marine Restricted Stock by SEACOR Holdings. Certain officers and employees of the Company previously received compensation through participation in SEACOR Holdings share award plans. Pursuant to the Employee Matters Agreement with SEACOR Holdings, participating Company personnel vested in all outstanding SEACOR Holdings share awards upon the spin-off in 2017 and received SEACOR Marine restricted stock from the spin-off distribution in connection with outstanding SEACOR Holdings restricted stock held. The Company paid SEACOR Holdings $ 2.7 million upon completion of the spin-off for the distribution of 120,693 shares of SEACOR Marine restricted stock, which was fully amortized as of December 31, 2022. Employee Stock Purchase Plan. During 2017, the Company adopted the SEACOR Marine Holdings Inc. 2017 Employee Stock Purchase Plan (the “Marine ESPP”). The Marine ESPP, if implemented by the Board of Directors, will permit the Company to offer shares of its Common Stock for purchase by eligible employees at a price equal to 85 % of the lesser of (i) the fair market value of a share of its Common Stock on the first day of the offering period or (ii) the fair market value of a share of its Common Stock on the last day of the offering period. There are 300,000 shares of the Company’s Common Stock reserved for issuance under the Marine ESPP during the ten years following its adoption. Share Award Transactions. Transactions in connection with the Company’s Equity Incentive Plans during the years ended December 31 were as follows: 2024 2023 2022 Director Stock Awards Granted 43,504 60,938 60,787 Restricted Stock Activity: Outstanding as of the beginning of year (1) 1,642,084 1,682,193 1,163,090 Granted 637,698 660,307 1,036,605 Vested (2) ( 887,556 ) ( 685,416 ) ( 514,002 ) Forfeited — ( 15,000 ) ( 3,500 ) Outstanding as of the end of year (3) 1,392,226 1,642,084 1,682,193 Stock Option Activity: Outstanding as of the beginning of year 1,026,031 1,026,865 1,061,357 Granted — — — Exercised (4) ( 12,166 ) ( 834 ) ( 34,492 ) Forfeited — — — Outstanding as of the end of year 1,013,865 1,026,031 1,026,865 (1) Includes 342,385 , 268,413 and 31,491 grants of performance-based restricted stock units as of December 31, 2023, 2022 and 2021, respectively, that satisfied the performance obligation and are therefore likely to vest. Excludes 156,620 , 216,172 and 354,964 grants of performance-based restricted stock units as of December 31, 2023, 2022 and 2021, respectively, that are not considered outstanding until such time that they become probable to vest. (2) Includes 157,455 , 73,972 and 236,922 vested grants of performance-based restricted stock units as of December 31, 2024, 2023 and 2022, respectively. (3) Includes 215,853 , 342,385 and 268,413 grants of performance-based restricted stock units as of December 31, 2024, 2023 and 2022, respectively, that satisfied the performance obligation and are therefore likely to vest. Excludes 326,597 , 156,620 and 216,172 grants of performance-based restricted stock units as of December 31, 2024, 2023 and 2022, respectively, that are not considered outstanding until such time that they become probable to vest. (4) The intrinsic value of the options exercised was less than $ 0.1 million. During the year ended December 31, 2024, the Company recognized $ 6.8 million of compensation expense related to stock awards, restricted stock and stock options granted to employees and directors under the 2017 Plan, the 2020 Plan and the 2022 Plan with a recognized tax benefit of $ 11.2 million. As of December 31, 2024, the Company had approximately $ 7.8 million in total unrecognized compensation costs. The weighted average period over which the compensation cost of non-vested awards will be recognized is approximately 0.73 years for restricted stock and there are no unvested stock options. During the year ended December 31, 2023, the Company recognized $ 6.3 million of compensation expense related to stock awards, restricted stock and stock options granted to employees and directors under the 2017 Plan, the 2020 Plan and the 2022 Plan with a recognized tax benefit of $ 7.0 million. As of December 31, 2023, the Company had approximately $ 6.6 million in total unrecognized compensation costs. The weighted average period over which the compensation cost of non-vested awards will be recognized is approximately 0.77 years for restricted stock and there are no unvested stock options. During the year ended December 31, 2022, the Company recognized $ 5.0 million of compensation expense related to stock awards, restricted stock and stock options granted to employees and directors under the 2017 Plan, the 2020 Plan and the 2022 Plan with a recognized tax benefit of $ 3.0 million. As of December 31, 2022, the Company had approximately $ 6.3 million in total unrecognized compensation costs. The weighted average period over which the compensation cost of non-vested awards will be recognized is approximately 1.02 and 0.17 years for restricted stock and stock options, respectively. The weighted average fair value of restricted stock granted under the 2017 Plan, the 2020 Plan and the 2022 Plan were $ 12.03 , $ 9.67 and $ 5.92 for the year ended December 31, 2024, 2023 and 2022 , respectively. The fair value was based on the closing price of the Company’s stock on the day of the grant. The Company did no t grant any options in the years ended December 31, 2024, 2023 and 2022 . There were 12,166 , 834 and 34,492 stock options exercised in December 31, 2024, 2023 and 2022, respectively. During the year ended December 31, 2024, the number of shares and the weighted average grant price of restricted stock transactions were as follows: Restricted Stock Number of Weighted Average Non-Vested as of December 31, 2023 1,642,084 $ 7.53 Granted 637,698 12.03 Vested ( 887,556 ) 12.28 Forfeited — — Non-Vested as of December 31, 2024 1,392,226 10.40 During the year ended December 31, 2024, the number of shares and the weighted average exercise price on stock option transactions were as follows: Stock Options Number of Weighted Average Outstanding as of December 31, 2023 1,026,031 $ 12.66 Granted — — Exercised ( 12,166 ) 11.48 Forfeited — — Outstanding as of December 31, 2024 (1) 1,013,865 12.68 Exercisable as of December 31, 2024 (2) 1,013,865 12.68 (1) The weighted average remaining contractual term is 3.8 years and the intrinsic value of the options exercised was $ 0.4 million. (2) The weighted average remaining contractual term is 3.8 years and the intrinsic value of the options exercisable was $ 0.4 million.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2024
Related Party Transactions [Abstract]
Related Party Transactions	14. RELATED PARTY TRANSACTIONS Related Party Transactions Policy. The Company has established a written policy for the review and approval or ratification of transactions with related parties (the “Related Party Transactions Policy”) to assist it in reviewing transactions, arrangements or relationships that exceed the threshold for disclosure established under Item 404(a) of Regulation S-K promulgated by the SEC, in which the Company or any of its subsidiaries is a participant, and any Related Party (as defined in the Related Party Transaction Policy) has or will have a direct or indirect interest (“Related Party Transactions”). The Related Party Transactions Policy supplements the Company’s other conflict of interest policies set forth in the Company’s Corporate Governance Guidelines, its Code of Business Conduct and Ethics and its other internal procedures. Transactions with Carlyle On December 16, 2024, proceeds from the 2024 SMFH Credit Facility were used to satisfy in full the Guaranteed Notes and New Convertible Notes described below. As a result of such repayment, the Carlyle Investors’ director nomination and board observation rights have terminated. Old Convertible Notes . On October 5, 2022, SEACOR Marine and the Carlyle Investors entered into two agreements pursuant to which SEACOR Marine issued the Carlyle Investors (i) $ 90.0 million in aggregate principal amount of the Guaranteed Notes and (ii) $ 35.0 million aggregate principal amount of the New Convertible Notes in exchange for all $ 125.0 million in aggregate principal amount of SEACOR Marine’s Old Convertible Notes outstanding. Guaranteed Notes. The Guaranteed Notes were issued pursuant to the Exchange Agreement (Guaranteed Notes) among SEACOR Marine, as issuer, FG Robert, as the guarantor, and the Carlyle Investors. Pursuant to the Guaranteed Notes Exchange Agreement, SEACOR Marine had the right to pay (i) in cash at a rate of 8.0 % per annum or (ii) partly in cash and partly in-kind by increasing the principal amount of the Guaranteed Notes or issuing additional Guaranteed Notes at a rate of 9.5 % per annum (“Hybrid Interest ” ) with the cash portion of the Hybrid Interest bearing interest at a rate of 4.25 % per annum and in the in-kind portion of the Hybrid Interest bearing interest at a rate of 5.25 % per annum. The Guaranteed Notes were guaranteed on a senior unsecured basis by FG Robert, the owner of the LB Robert liftboat. SEACOR Marine could redeem some or all of the Guaranteed Notes at any time in minimum denominations of $ 10.0 million, upon not less than 30 nor more than 60 calendar days’ notice, at a price equal to (a) 101 % of the principal amount of the Guaranteed Notes redeemed, if redeemed prior to October 1, 2024 and (b) 100 % of the principal amount of the Guaranteed Notes redeemed, if redeemed on or after October 1, 2024, in each case plus accrued and unpaid interest, if any, to, but not including, the redemption date, provided, SEACOR Marine could not redeem the Guaranteed Notes if the principal amount of Guaranteed Notes and New Convertible Notes outstanding will be equal to or less than $ 50.0 million in the aggregate, unless SEACOR Marine redeems all of the Guaranteed Notes in whole. The Guaranteed Notes Exchange Agreement contained certain customary covenants that among others, limited the ability of (i) SEACOR Marine and FG Robert to incur indebtedness, (ii) FG Robert to create or incur liens, (iii) SEACOR Marine to create liens on the ownership interest of FG Robert, (iv) FG Robert to sell assets, and (v) SEACOR Marine to sell the ownership interest of FG Robert, as well as customary representations and warranties made by SEACOR Marine, FG Robert and the Carlyle Investors and customary events of default. The Guaranteed Notes would have matured on July 1, 2026 but proceeds from the 2024 SMFH Credit Facility were used to satisfy in full the Guaranteed Notes. New Convertible Notes. The New Convertible Notes were issued pursuant to the Exchange Agreement (Convertible Notes) among SEACOR Marine, as issuer, and the Carlyle Investors. The New Convertible Notes bore interest at a rate of 4.25 % per annum payable semi-annually in arrears. The New Convertible Notes were convertible into shares of Common Stock at the option of the holders at a conversion rate of 85.1064 shares per $ 1,000 in principal amount of New Convertible Notes (equivalent to a “Conversion Price” of $ 11.75 ) or into warrants to purchase an equal number of shares of Common Stock at an exercise price of $ 0.01 per share in order to facilitate SEACOR Marine’s compliance with the provisions of the Jones Act. In addition, SEACOR Marine had the right to cause the mandatory conversion of the New Convertible Notes into Common Stock if the daily VWAP of the Common Stock equals or exceeds (A) in the case of New Convertible Notes held by affiliates of Carlyle, 150 % of the Conversion Price and (B) in the case of New Convertible Notes held by any Person other than Carlyle, 115 % of the Conversion Price, in each case for each of the 20 consecutive trading days. If SEACOR Marine underwent a Company Fundamental Change (as defined in the Convertible Notes Exchange Agreement), the holders of the New Convertible Notes could require SEACOR Marine to purchase for cash all or part of the New Convertible Notes at a price equal to 100 % of the principal amount the New Convertible Notes to be purchased, plus accrued and unpaid interest to the date of purchase. The New Convertible Notes could be redeemed, in whole but not in part and only if certain conditions are met, as more fully described in the Convertible Notes Exchange Agreement, at a price equal to 100 % of the principal amount of the New Convertible Notes to be redeemed, plus accrued and unpaid interest to the date of redemption. The New Convertible Notes would have matured on July 1, 2026 but proceeds from the 2024 SMFH Credit Facility were used to satisfy in full the New Convertible Notes. Under the Convertible Notes Exchange Agreement, the Carlyle Investors had the ability to nominate one director to the Board of Directors if the Carlyle Investors, solely as a result of their ownership of shares of Common Stock owned by the Investors as of October 5, 2022 and ownership of the New Convertible Notes and warrants (including the shares of common stock of the Company issuable upon conversion or exercise thereof), beneficially own collectively 10 % or more of the outstanding shares of common stock of the Company. The Carlyle Investors did not exercise this right. Ms. Anna Mire had been designated by the Carlyle Investors to observe meetings of the Board of Directors pursuant to the Carlyle Investors’ observer rights under the Convertible Notes Exchange Agreement and the Guaranteed Notes Exchange Agreement. As noted above, the Carlyle Investors’ director nomination and board observation rights terminated on December 16, 2024 in connection with the payoff of the New Convertible Notes and Guaranteed Notes. The Convertible Notes Exchange Agreement contained customary representations and warranties made by SEACOR Marine and the Carlyle Investors and contained customary events of default and covenants. The Convertible Notes Exchange Agreement and the transactions contemplated thereby were subject to the oversight of, and received advance approval from, the Audit Committee. During 2024 and 2023, the Carlyle Investors exercised 24,138 and 135,150 warrants, respectively. During 2022, the Carlyle Investors did no t exercise any warrants. As of December 31, 2024, the Carlyle Investors had 1,280,195 outstanding warrants. Transactions with CME Mr. Alfredo Miguel Bejos, a member of the Board of Directors, currently serves as President and Chief Executive Officer of CME. In accordance with the Related Transaction Policy, the Audit Committee has adopted guidelines for addressing ongoing CME-related transactions. Prior to the consummation of the Framework Agreement Transactions described below, the Company participated in a variety of joint ventures with CME, including MexMar, SEACOR Marlin LLC and OVH. The joint venture agreements for each of these joint ventures were negotiated at arms-length in the ordinary course of business. MexMar was a joint venture company that was 49 % owned by a wholly owned subsidiary of the Company and 51 % owned by subsidiaries of CME. SEACOR Marlin LLC was a joint venture company that was 49 % owned by a wholly owned subsidiary of the Company and 51 % owned by a wholly owned subsidiary of MexMar. OVH was a joint venture company that was 49 % owned by a wholly owned subsidiary of the Company and 51 % owned by a subsidiary of CME. On September 29, 2022, SEACOR Marine and certain of its subsidiaries, on the one hand, and OTM, CME Ireland, and OVH, on the other hand, entered into the Framework Agreement. OTM and CME Ireland are affiliates of CME. Prior to the closing of the Framework Agreement Transactions, the Company owned 49 % of each of MexMar and OVH through SEACOR Marine International, a wholly owned subsidiary of the Company, and the remaining 51 % ownership interests were held by OTM. The Company also owned a minority interest in SEACOR Marlin LLC, the owner of the PSV SEACOR Marlin, and the remaining ownership interests of SEACOR Marlin LLC were held by MexMar. The Framework Agreement provided for, among other things, (i) the sale by the Company of all of the outstanding equity interests of SEACOR Marine International to OTM for a purchase price of $ 66.0 million, (ii) the sale by the Company of the AHTS SEACOR Davis to CME Ireland in exchange for the remaining equity interests in SEACOR Marlin LLC, such that SEACOR Marlin LLC would become a wholly owned subsidiary of the Company, (iii) the transfer of a hybrid battery power system from OVH to the Company as repayment in full of a certain vessel loan agreement by the Company to its former joint venture, and (iv) entry into a bareboat charter agreement between SEACOR Marlin LLC and MexMar. Each of the Framework Agreement Transactions was consummated on September 29, 2022. As a result of the Framework Agreement Transactions, the Company no longer owns any equity interest in either of MexMar or OVH, and the Company owns all of the equity interests in SEACOR Marlin LLC, which owns the PSV SEACOR Marlin. In connection with the closing of the Framework Agreement Transactions, on September 29, 2022, SEACOR Marine Capital, a wholly owned subsidiary of SEACOR Marine, purchased all of the outstanding loans under the Second Amended and Restated Term Loan Credit Facility Agreement, made as of July 8, 2022, by and among MexMar, as the borrower, DNB Capital LLC and The Governor and Company of the Bank of Ireland, each as lenders, and DNB Bank ASA, New York Branch, as facility agent (as amended from time to time, the “MexMar Original Facility Agreement”) for an aggregate amount of $ 28.8 million, representing par value of the loan. The purchase was funded using proceeds received from the Framework Agreement Transactions. On the same date the facility was amended pursuant to a Third Amended and Restated Facility Agreement (“MexMar Third A&R Facility Agreement”) to, among other things, (i) provide for the prepayment by MexMar of approximately $ 8.8 million of the outstanding loan amount, to reduce the outstanding principal on the loan to $ 20.0 million, (ii) modify the definition of “Change of Control”, (iii) modify the maturity date from January 23, 2025 to September 30, 2023 , (iv) decrease the minimum cash requirement from $ 10.0 million to $ 2.5 million, (v) modify the interest margin from 4.7 % per annum to 5.0 % per annum and (vi) modify the principal repayment profile to reflect four quarterly installments of $ 5.0 million to repay the loan by the maturity date. All collateral and security arrangements remained in place from the MexMar Original Facility Agreement, including a first priority mortgage on 13 offshore support vessels owned by MexMar. As a result, SEACOR Marine Capital was the sole lender to MexMar under the MexMar Third A&R Facility Agreement. This loan was repaid in full as of September 30, 2023 . Each of the Framework Agreement Transactions and the transactions entered into in connection with the MexMar Third A&R Facility Agreement (the “MexMar Facility Agreement Transactions”) were subject to the oversight of, and received advance approval from, the Audit Committee as related party transactions subject to the Company’s Related Party Transaction Policy. Mr. Miguel recused himself from the Audit Committee and the Board of Directors deliberations with respect to the Framework Agreement Transactions and the MexMar Facility Agreement Transactions. The Board of Directors received a third party fairness opinion with respect to the Framework Agreement Transactions.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	15. COMMITMENTS AND CONTINGENCIES As of December 31, 2024 , the Company had unfunded capital commitments of $ 90.0 million consisting of $ 82.7 million in respect of the construction of two PSVs, $ 4.4 million in respect of four hybrid battery power systems and $ 2.9 million for miscellaneous vessel equipment. Of the unfunded capital commitments, $ 41.6 million is payable during 2025, $ 29.9 million is payable during 2026 and the remainder payable during 2027. In accordance with the terms of the 2024 SMFH Credit Facility, $ 18.0 million of the proceeds from the sale of two AHTS was designated to make payments on the construction of two PSVs of which $ 16.0 million remained in a restricted account as of December 31, 2024. Additionally, the 2024 SMFH Credit Facility includes a dedicated $ 41.0 million tranche that may be used to pay up to 50 % of the purchase price of these vessels. In December 2015, the Brazilian Federal Revenue Office issued a tax-deficiency notice to Seabulk Offshore do Brasil Ltda., an indirect wholly-owned subsidiary of SEACOR Marine (“Seabulk Offshore do Brasil”), with respect to certain profit participation contributions (also known as “PIS”) and social security financing contributions (also known as “COFINS”) requirements alleged to be due from Seabulk Offshore do Brasil (“Deficiency Notice”) in respect of the period of January 2011 until December 2012. In January 2016, the Company administratively appealed the Deficiency Notice on the basis that, among other arguments, (i) such contributions were not applicable in the circumstances of a 70 %/ 30 % cost allocation structure, and (ii) the tax inspector had incorrectly determined that values received from outside of Brazil could not be classified as expense refunds. The initial appeal was dismissed by the Brazilian Federal Revenue Office and the Company appealed such dismissal and is currently awaiting an administrative trial. A local Brazilian law has been enacted that supports the Company’s position that such contribution requirements are not applicable, but it is uncertain whether such law will be taken into consideration with respect to administrative proceedings commenced prior to the enactment of the law. Accordingly, the success of Seabulk Offshore do Brasil in the administrative proceedings cannot be assured and the matter may need to be addressed through judicial court proceedings. The potential levy arising from the Deficiency Notice is R$ 26.4 million based on a historical potential levy of R$ 12.87 million (USD $ 4.3 million and USD $ 2.1 million, respectively, based on the exchange rate as of December 31, 2024). In the normal course of its business, the Company becomes involved in various other litigation matters including, among others, claims by third parties for alleged property damages and personal injuries. Management has used estimates in determining the Company’s potential exposure to these matters and has recorded reserves in its financial statements related thereto where appropriate. It is possible that a change in the Company’s estimates of that exposure could occur, but the Company does not expect that such changes in estimated costs would have a material effect on the Company’s consolidated financial position, results of operations or cash flows. Certain of the Company’s subsidiaries are participating employers in two industry-wide, multi-employer, defined benefit pension funds in the United Kingdom: the U.K Merchant Navy Officers Pension Fund (“MNOPF”) and the U.K. Merchant Navy Ratings Pension Fund (“MNRPF”). The Company’s participation in the MNOPF began with the acquisition of the Stirling group of companies (the “Stirling Group”) in 2001 and relates to certain officers employed between 1978 and 2002 by the Stirling Group and/or its predecessors. The Company’s participation in the MNRPF also began with the acquisition of the Stirling Group in 2001 and relates to ratings employed by the Stirling Group and/or its predecessors through today. Both of these plans are in deficit positions and, depending upon the results of future actuarial valuations, it is possible that the plans could experience funding deficits that will require the Company to recognize payroll related operating expenses in the periods invoices are received. As of December 31, 2024, all invoices received related to MNOPF and MNRPF have been settled in full. On July 5, 2024, the Company was informed by the MNRPF that $ 0.4 million (£ 0.3 million) of the cumulative funding deficit of the MNRPF was allocated to the Company as a participating employer, for which the Company paid in full in October 2024. On November 6, 2024, the Company was informed by the MNOPF that no further contributions from participating employers were required based on the results of the 2024 valuation.

Major Customers and Segment Inf

Major Customers and Segment Information	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Major Customers and Segment Information	16. MAJOR CUSTOMERS AND SEGMENT INFORMATION During the year ended December 31, 2024, Azule Energy Angola S.p.A., a joint venture between BP p.l.c. and Eni S.p.A., and SEACOR Marine Arabia, a joint venture of which the Company owns 45 % and through which vessels are in service to Saudi Arabian Oil Company, were responsible for $ 57.6 million or 21 % and $ 51.0 million or 19 %, respectively, of the Company’s total consolidated operating revenues. During the year ended December 31, 2023, ExxonMobil, SEACOR Marine Arabia and Azule Energy Angola S.p.A. were responsible for $ 47.7 million or 17 %, $ 43.2 million or 15 % and $ 42.4 million or 15 %, respectively, of the Company’s total consolidated operating revenues. During the year ended December 31, 2022, ExxonMobil and SEACOR Marine Arabia were responsible for $ 39.6 million or 18 % and $ 30.1 million or 14 %, respectively, of the Company’s total consolidated operating revenues. For the years ended December 31, 2024, 2023 and 2022 , the ten largest customers of the Company accounted for approximately 76 %, 73 % and 66 %, respectively, of the Company’s operating revenues. The loss of one or more of these customers could have a material adverse effect on the Company’s results of operations and cash flows. For the years ended December 31, 2024, 2023 and 2022 , approximately 87 %, 79 % and 72 %, respectively, of the Company’s operating revenues and $ 2.3 million, $ 3.6 million and $ 7.0 million, respectively, of equity in earnings from 50% or less owned companies, net of tax, were derived from its foreign operations. The Company’s offshore support vessels are highly mobile and regularly and routinely move between countries within a geographic region of the world. In addition, these vessels may be redeployed among the geographic regions, subject to flag restrictions, as changes in market conditions dictate. Because of this asset mobility, operating revenues and long-lived assets in any one country and capital expenditures for long-lived assets and gains or losses on asset dispositions and impairments in any one geographic region are not considered meaningful. Direct vessel profit is the Company’s measure of segment profitability when applied to reportable segments. Direct vessel profit is defined as operating revenues less direct operating expenses excluding leased-in equipment expense. The Company utilizes direct vessel profit as its primary financial measure to analyze and compare the operating performance of its regions. The following tables summarize the operating results, capital expenditures and assets of the Company’s reportable segments for the periods indicated (in thousands): United States Africa and Europe Middle East Latin Total For the year ended December 31, 2024 Operating Revenues: Time charter $ 31,991 $ 99,410 $ 70,346 $ 52,573 $ 254,320 Bareboat charter — — — 1,464 1,464 Other marine services 3,808 5,272 1,979 4,518 15,577 35,799 104,682 72,325 58,555 271,361 Direct Costs and Expenses: Operating: Personnel 24,459 21,887 24,132 15,063 85,541 Repairs and maintenance 6,618 13,537 13,047 7,183 40,385 Drydocking 8,604 4,774 2,796 5,277 21,451 Insurance and loss reserves 2,992 2,329 3,147 1,426 9,894 Fuel, lubes and supplies 3,351 7,197 4,184 5,215 19,947 Other 509 12,723 4,425 2,377 20,034 46,533 62,447 51,731 36,541 197,252 Direct Vessel (Loss) Profit $ ( 10,734 ) $ 42,235 $ 20,594 $ 22,014 $ 74,109 Other Costs and Expenses: Lease expense $ 555 $ 507 $ 301 $ 315 1,678 Administrative and general 44,713 Depreciation and amortization 12,334 17,497 13,276 8,521 51,628 98,019 Gains on asset dispositions and impairments, net 13,481 Operating loss $ ( 10,429 ) As of December 31, 2024 Property and Equipment: Historical cost $ 195,756 $ 325,000 $ 240,075 $ 139,583 $ 900,414 Accumulated depreciation ( 104,771 ) ( 121,320 ) ( 97,908 ) ( 43,449 ) ( 367,448 ) $ 90,985 $ 203,680 $ 142,167 $ 96,134 $ 532,966 Total Assets (1) $ 120,347 $ 241,278 $ 174,410 $ 117,475 $ 653,510 (1) Total Assets exclude $ 73.6 million of corporate assets. United States Africa and Europe Middle East Latin America Total For the year ended December 31, 2023 Operating Revenues: Time charter $ 41,850 $ 87,729 $ 66,407 $ 55,399 $ 251,385 Bareboat charter — — — 1,460 1,460 Other marine services 17,678 2,582 4,345 2,061 26,666 59,528 90,311 70,752 58,920 279,511 Direct Costs and Expenses: Operating: Personnel 26,110 20,434 20,786 14,440 81,770 Repairs and maintenance 5,146 9,624 7,109 4,947 26,826 Drydocking 2,314 2,946 ( 99 ) 1,437 6,598 Insurance and loss reserves 3,752 1,727 3,638 839 9,956 Fuel, lubes and supplies 3,697 6,830 3,552 3,108 17,187 Other 1,427 10,072 3,961 1,853 17,313 42,446 51,633 38,947 26,624 159,650 Direct Vessel Profit $ 17,082 $ 38,678 $ 31,805 $ 32,296 $ 119,861 Other Costs and Expenses: Lease expense $ 536 $ 1,498 $ 360 $ 354 2,748 Administrative and general 49,183 Depreciation and amortization 14,685 15,346 14,760 9,030 53,821 105,752 Gains on asset dispositions and impairments, net 21,409 Operating income $ 35,518 As of December 31, 2023 Property and Equipment: Historical cost $ 209,262 $ 272,272 $ 267,079 $ 170,210 $ 918,823 Accumulated depreciation ( 99,137 ) ( 93,045 ) ( 94,708 ) ( 37,251 ) ( 324,141 ) $ 110,125 $ 179,227 $ 172,371 $ 132,959 $ 594,682 Total Assets (1) $ 142,264 $ 215,158 $ 199,174 $ 152,427 $ 709,023 (1) Total Assets exclude $ 71.3 million of corporate assets. United States Africa and Europe Middle East Latin America Total For the year ended December 31, 2022 Operating Revenues: Time charter $ 51,272 $ 60,060 $ 52,080 $ 40,122 $ 203,534 Bareboat charter — — — 1,374 1,374 Other marine services 9,528 ( 163 ) 762 2,290 12,417 60,800 59,897 52,842 43,786 217,325 Direct Costs and Expenses: Operating: Personnel 25,201 16,436 22,376 13,769 77,782 Repairs and maintenance 7,049 9,229 8,111 7,107 31,496 Drydocking 8,978 2,339 6,569 274 18,160 Insurance and loss reserves 4,831 1,178 2,838 1,115 9,962 Fuel, lubes and supplies 3,345 8,022 5,089 2,833 19,289 Other 1,235 7,175 4,633 2,253 15,296 50,639 44,379 49,616 27,351 171,985 Direct Vessel Profit $ 10,161 $ 15,518 $ 3,226 $ 16,435 $ 45,340 Other Costs and Expenses: Lease expense $ 998 $ 1,691 $ 156 $ 1,024 3,869 Administrative and general 40,911 Depreciation and amortization 17,444 13,708 16,331 8,474 55,957 100,737 Gains on asset dispositions and impairments, net 1,398 Operating loss $ ( 53,999 ) As of December 31, 2022 Property and Equipment: Historical cost $ 232,740 $ 285,303 $ 286,745 $ 162,895 $ 967,683 Accumulated depreciation ( 101,503 ) ( 92,030 ) ( 89,444 ) ( 27,801 ) ( 310,778 ) $ 131,237 $ 193,273 $ 197,301 $ 135,094 $ 656,905 Total Assets (1) $ 174,081 $ 211,371 $ 215,497 $ 150,650 $ 751,599 (1) Total Assets exclude $ 64.0 million of corporate assets.

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2024
Subsequent Events [Abstract]
Subsequent Events	17. SUBSEQUENT EVENTS The Company has evaluated subsequent events through the filing of this Annual Report on Form 10-K and determined that there have been no material events that have occurred that are not properly recognized and/or disclosed in the consolidated financial statements.

Nature of Operations and Acco_2

Nature of Operations and Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2024
Accounting Policies [Abstract]
Nature of Operations and Segmentation	Nature of Operations and Segmentation. The consolidated financial statements include the accounts of SEACOR Marine Holdings Inc. (“SEACOR Marine”), and its consolidated subsidiaries (collectively referred to as the “Company”). The Company provides global marine and support transportation services to offshore energy facilities worldwide. The Company operates and manages a diverse fleet of offshore support vessels that (i) deliver cargo and personnel to offshore installations, including offshore wind farms, (ii) assist offshore operations for production and storage facilities, (iii) provide construction, well work-over, offshore wind farm installation and decommissioning support, and (iv) carry and launch equipment used underwater in drilling and well installation, maintenance, inspection and repair. Additionally, the Company's vessels provide emergency response services and accommodations for technicians and specialists. Accounting standards require public business enterprises to report information about each of their operating business segments that exceed certain quantitative thresholds or meet certain other reporting requirements. Operating business segments have been defined as a component of an enterprise about which separate financial information is available and is evaluated regularly by the chief operating decision maker, the President and Chief Executive Officer, in assessing performance and allocating resources. The Company has identified the following four principal geographic regions as its reporting segments: United States, primarily Gulf of America. As of December 31, 2024 , 10 owned vessels were located in this region. The Company’s vessels in this market support oil and natural gas exploration and production activities, seasonal construction, decommissioning and diving support operations, as well as the construction and maintenance of offshore wind farms in the Northeast of the U.S. Africa and Europe. As of December 31, 2024 , 20 vessels were located in this region, including 19 owned and one managed. The Company’s vessels in this market generally support projects for major oil companies, primarily in Angola, Nigeria and the North Sea. Middle East and Asia. As of December 31, 2024 , 15 vessels were located in this region, including 13 owned and two managed . The Company’s vessels in this area generally support exploration, personnel transport and seasonal construction activities in Saudi Arabia, United Arab Emirates, Qatar, Egypt and Israel. Latin America. As of December 31, 2024 , nine owned vessels were located in this region. The Company’s vessels in this area generally provide support for exploration and production activities primarily in Mexico, Guyana and Trinidad and Tobago. From time to time, the Company’s vessels also work in Brazil and Colombia.
Basis of Consolidation	Basis of Consolidation. The consolidated financial statements include the accounts of SEACOR Marine and its controlled subsidiaries. Control is generally deemed to exist if the Company has greater than 50 % of the voting rights of a subsidiary. All significant intercompany accounts and transactions are eliminated in the combination and consolidation. Noncontrolling interests in consolidated subsidiaries are included in the consolidated balance sheets as a separate component of equity. The Company reports consolidated net income (loss) inclusive of both the Company’s and the noncontrolling interests’ share, as well as the amounts of consolidated net income (loss) attributable to each of the Company and the noncontrolling interests. If a subsidiary is deconsolidated upon a change in control, any retained noncontrolling equity investment in the former controlled subsidiary is measured at fair value and a gain or loss is recognized in net income (loss) based on such fair value. If a subsidiary is consolidated upon the business acquisition of controlling interests by the Company, any previous noncontrolled equity investment in the subsidiary is measured at fair value and a gain or loss is recognized in net income (loss) based on such fair value. The Company employs the equity method of accounting for investments in 50% or less owned companies that it does not control but has the ability to exercise significant influence over the operating and financial policies of the business venture. Significant influence is generally deemed to exist if the Company has between 20 % and 50 % of the voting rights of a business venture but may exist when the Company’s ownership percentage is less than 20%. In certain circumstances, the Company may have an economic interest in excess of 50% but may not control and consolidate the business venture. Conversely, the Company may have an economic interest less than 50% but may control and consolidate the business venture. The Company reports its investments in and advances to these business ventures in the accompanying consolidated balance sheets as investments, at equity, and advances to 50% or less owned companies. The Company reports its share of earnings from investments in 50% or less owned companies in the accompanying consolidated statements of income (loss) as equity in earnings of 50% or less owned companies, net of tax. Certain reclassifications were made to previously reported amounts in the consolidated financial statements and notes thereto to make them consistent with the current period presentation.
Use of Estimates	Use of Estimates. The preparation of financial statements in conformity with accounting principles generally accepted in the United States (“U.S.”) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from estimates and those differences may be material.
Revenue Recognition	Revenue Recognition. The Company contracts with various customers to carry out management services for vessels as agents for and on behalf of ship owners. These services include crew management, technical management, commercial management, insurance arrangements, sale and purchase of vessels, provisions and bunkering. As the manager of the vessels, the Company undertakes to use its best endeavors to provide the agreed management services as agents for and on behalf of the owners in accordance with sound ship management practice and to protect and promote the interest of the owners in all matters relating to the provision of services thereunder. The Company also contracts with various customers to carry out management services regarding engineering for vessel construction and vessel conversions. The vast majority of the ship management agreements span one to three years and are typically billed on a monthly basis. The Company transfers control of the service to the customer and satisfies its performance obligation over the term of the contract, and therefore recognizes revenue over the term of the contract while related costs are expensed as incurred. Revenue that does not meet these criteria is deferred until the criteria is met and is considered a contract liability and is recognized as such. Contract liabilities, which are included in unearned revenue in the accompanying consolidated balance sheets, for the years ended December 31 were as follows (in thousands): 2024 2023 2022 Balance at beginning of year $ 687 $ 2,333 $ 1,606 Unearned revenues during the year 6,689 6,501 4,288 Revenues recognized during the year ( 4,842 ) ( 8,147 ) ( 3,561 ) Balance at end of year $ 2,534 $ 687 $ 2,333 As of December 31, 2024, December 31, 2023 and December 31, 2022 , the Company had unearned revenue of $ 2.5 million, $ 0.7 million and $ 2.3 million, respectively, primarily related to mobilization of vessels. The Company earns revenue primarily from the time charter and bareboat charter of vessels to customers. Since the Company charges customers based upon daily rates of hire, vessel revenues are recognized on a daily basis throughout the contract period. Under a time charter, the Company provides a vessel to a customer and is responsible for all operating expenses, typically excluding fuel. Under a bareboat charter, the Company provides a vessel to a customer and the customer assumes responsibility for all operating expenses and assumes all risks of operation. In the U.S. Gulf of America, time charter durations and rates are typically established in the context of master service agreements that govern the terms and conditions of the charter. In the Company’s operating areas, contracts or charters vary in length from several days to multi-year periods. Many of the Company’s contracts and charters include cancellation clauses without early termination penalties. As a result of cancellations, options and frequent renewals, the stated duration of charters may not correlate with the length of time the vessel is contracted for to provide services to a particular customer. During the year ended December 31, 2024, the Company did no t recognize any business interruption insurance recoveries. During the years ended December 31, 2023 and 2022, the Company recognized an aggregate amount of business interruption insurance recoveries of $ 10.0 million and $ 1.9 million, respectively, included in operating revenues in the accompanying consolidated statements of income (loss).
Direct Operating Expenses	Direct Operating Expenses. Direct operating costs and expenses that are considered significant, other than leased-in equipment expense, consist primarily of costs and expenses such as: personnel; repairs and maintenance; drydocking; insurance and loss reserves; and fuel, lubes and supplies. Other direct operating expenses consist of costs such as brokers’ commissions, communication costs, expenses incurred in mobilizing vessels between geographic regions, third party ship management fees, freight expenses, and customs and importation duties. Direct operating costs are expensed as incurred.
Cash Equivalents	Cash Equivalents. The Company considers all highly liquid investments, with an original maturity of three months or less from the date purchased, to be cash equivalents. Cash equivalents consist of U.S. treasury securities, money market instruments, time deposits and overnight investments. A portion of the Company’s cash is maintained at federally insured financial institutions. The deposits held at these institutions are in excess of federally insured limits. The Company has not experienced any losses in such accounts and management believes that the Company is not exposed to significant credit risk due to the financial position of the depository institution in which those deposits are held.
Restricted Cash	Restricted Cash. Restricted cash primarily relates to banking and credit facility requirements, including, as of December 31, 2024, $ 16.0 million held in a restricted account with various permitted uses under the terms of the 2024 SMFH Credit Facility. For the years ended December 31, cash, cash equivalents and restricted cash consists of (in thousands): 2024 2023 Cash $ 59,491 $ 67,455 Restricted cash 16,649 16,676 Total $ 76,140 $ 84,131
Trade and Other Receivables and Allowance for Credit Losses	Trade and Other Receivables and Allowance for Credit Losses. Customers are primarily major integrated national, international oil companies, large independent oil and natural gas exploration and production companies and established wind farm construction companies. Customers are granted credit on a short-term basis and the related credit risks are minimal. Other receivables consist primarily of operating expenses the Company incurs in relation to vessels it manages for other entities, as well as insurance and income tax receivables. During the year ended December 31, 2024, Azule Energy Angola S.p.A., a joint venture between BP p.l.c. and Eni S.p.A., and SEACOR Marine Arabia, a joint venture of which the Company owns 45 % and through which vessels are in service to Saudi Arabian Oil Company, were responsible for $ 18.3 million or 26 % and $ 13.0 million or 19 %, respectively, of the Company’s total consolidated trade receivables. During the year ended December 31, 2023, SEACOR Marine Arabia and Azule Energy Angola S.p.A. were responsible for $ 14.4 million or 22 % and $ 11.9 million or 18 %, respectively, of the Company’s total consolidated trade receivables. The Company routinely reviews its receivables and makes provisions for expected credit losses utilizing the Current Expected Credit Losses model (“CECL”). The CECL model utilizes a lifetime expected credit loss measurement objective for the recognition of credit losses for loans and other receivables at the time the financial asset is originated or acquired. However, those provisions are estimates and actual results may materially differ from those estimates. After collection efforts have been exhausted, trade receivables that are deemed uncollectible are removed from both accounts receivable and the allowance for credit losses. Allowance for credit loss reserves for the years ended December 31 were as follows (in thousands): Description Balance Reserves Acquired Charges Deductions Balance Year Ended December 31, 2024 Allowance for credit loss reserves (deducted from trade and notes receivable) $ 4,543 $ — $ 202 $ — $ 4,745 Year Ended December 31, 2023 Allowance for credit loss reserves (deducted from trade and notes receivable) $ 1,650 $ — $ 3,519 $ ( 626 ) $ 4,543 Year Ended December 31, 2022 Allowance for credit loss reserves (deducted from trade and notes receivable) $ 1,312 $ — $ 489 $ ( 151 ) $ 1,650
Derivative Instruments	Derivative Instruments. The Company accounts for derivatives through the use of a fair value concept whereby all of the Company’s derivative positions are stated at fair value in the accompanying consolidated balance sheets. Realized and unrealized gains and losses on derivatives not designated as hedges are reported in the accompanying consolidated statements of income (loss) as Derivative gains (losses), net. Realized and unrealized gains and losses on derivatives designated as fair value hedges are recognized as corresponding increases or decreases in the fair value of the underlying hedged item to the extent they are effective, with any ineffective portion reported in the accompanying consolidated statements of income (loss) as Derivative gains (losses), net, and related cash flows are classified in the same category on the cash flow statement as the cash flows from the items being hedged. Realized and unrealized gains and losses on derivatives designated as cash flow hedges are reported as a component of other comprehensive income (loss) in the accompanying consolidated statements of comprehensive income (loss) to the extent they are effective and reclassified into earnings on the same line item associated with the hedged transaction and in the same period the hedged transaction affects earnings and related cash flows are classified in the same category on the cash flow statement as the cash flows from the items being hedged. Any ineffective portions of cash flow hedges are reported in the accompanying consolidated statements of income (loss) as Derivative gains (losses), net. Realized and unrealized gains and losses on derivatives designated as cash flow hedges that are entered into by the Company’s 50% or less owned companies are also reported as a component of the Company’s other comprehensive income (loss) in proportion to the Company’s ownership percentage, with reclassifications and ineffective portions being included in Equity in earnings of 50% or less owned companies, net of tax, in the accompanying consolidated statements of income (loss).
Concentrations of Credit Risk	Concentrations of Credit Risk. The Company is exposed to concentrations of credit risk associated with its cash and cash equivalents, restricted cash and derivative instruments. The Company minimizes its credit risk relating to these positions by monitoring the financial condition of the financial institutions and counterparties involved and by primarily conducting business with large, well-established financial institutions and diversifying its counterparties. The Company does not currently anticipate nonperformance by any of its significant counterparties. The Company is also exposed to concentrations of credit risk relating to its receivables due from customers described above. The Company does not generally require collateral or other security to support its outstanding receivables. The Company minimizes its credit risk relating to receivables by performing ongoing credit evaluations and, to date, credit losses have not been material.
Inventories	Inventories. Inventories, which consist of fuel and supplies, are stated at the lower of cost (using the first-in, first-out method) or net realizable value. The Company records write-downs, as needed, to adjust the carrying amount of inventories to the lower of cost or net realizable value. In the years ended December 31, 2024, 2023 and 2022 , there were no inventory reserves.
Property and Equipment	Property and Equipment. Equipment, stated at cost, is depreciated using the straight-line method over the estimated useful life of the asset to an estimated salvage value. With respect to each class of asset, the estimated useful life is based upon a newly built asset being placed into service and represents the time period beyond which it is typically not justifiable for the Company to continue to operate the asset in the same or similar manner. From time to time, the Company may acquire older vessels that have already exceeded the Company’s useful life policy, in which case the Company depreciates such assets based on its best estimate of the asset’s remaining useful life, typically the period until the next survey or certification date. As of December 31, 2024 , the estimated useful life of the Company’s new offshore support vessels was 20 years. The Company’s property and equipment as of December 31 was as follows (in thousands): Historical (1) Accumulated Net Book 2024 Offshore support vessels: AHTS (2) $ 948 $ ( 825 ) $ 123 FSV (3) 344,833 ( 160,823 ) 184,010 PSV (4) 290,416 ( 66,478 ) 223,938 Liftboats 243,295 ( 118,923 ) 124,372 General machinery and spares 9,394 ( 9,248 ) 146 Other (5) 11,528 ( 11,151 ) 377 $ 900,414 $ ( 367,448 ) $ 532,966 2023 Offshore support vessels: AHTS (2) $ 12,112 $ ( 4,578 ) $ 7,534 FSV (3) 340,411 ( 142,096 ) 198,315 PSV (4) 301,461 ( 53,100 ) 248,361 Liftboats 243,295 ( 103,459 ) 139,836 General machinery and spares 9,343 ( 9,161 ) 182 Other (5) 12,201 ( 11,747 ) 454 $ 918,823 $ ( 324,141 ) $ 594,682 (1) Includes property and equipment acquired in business acquisitions at acquisition date fair value and net of the impact of recognized impairment charges. Most of the Company’s vessels are pledged as collateral under the 2024 SMFH Credit Facility. (2) Anchor handling towing supply vessels (“AHTS”). (3) Fast support vessels (“FSVs”). (4) Platform support vessels (“PSVs”). (5) Includes buildings, leasehold improvements, vehicles and other property and equipment. Depreciation and amortization expense totaled $ 51.6 million, $ 53.8 million and $ 56.0 million in 2024, 2023 and 2022, respectively. Equipment maintenance and repair costs and the costs of routine overhauls, drydockings and inspections performed on vessels and equipment are charged to operating expense as incurred. Expenditures that extend the useful life or improve the marketing and commercial characteristics of equipment as well as major renewals and improvements to other properties are capitalized. Certain interest costs incurred during the construction of equipment are capitalized as part of the assets’ carrying values and are amortized over such assets’ estimated useful lives. There was no capitalized interest recognized in 2024, 2023 or 2022.
Assets Held for Sale	Assets Held for Sale. As of December 31, 2024 , one PSV previously included in the Middle East and Asia segment, with a carrying value of $ 5.5 million, and one PSV previously included in the United States, primarily U.S. Gulf of America segment, with a carrying value of $ 5.4 million, were classified as assets held for sale as the Company expects to sell the vessels within one year.
Impairment of Long-Lived Assets and Impairment of 50% or Less Owned Companies	Impairment of Long-Lived Assets. The Company performs an impairment analysis of long-lived assets used in operations when indicators of impairment are present. These indicators may include a significant decrease in the market price of a long-lived asset or asset group, a significant adverse change in the extent or manner in which a long-lived asset or asset group is being used or in its physical condition, or a current period operating or cash flow loss combined with a history of operating or cash flow losses or a forecast that demonstrates continuing losses associated with the use of a long-lived asset or asset group. If the carrying values of the assets are not recoverable, as determined by their estimated future undiscounted cash flows, the estimated fair value of the assets or asset groups are compared to their current carrying values and impairment charges are recorded if the carrying value exceeds fair value. When reviewing its fleet for impairment, the Company groups vessels with similar operating and marketing characteristics, including cold-stacked vessels expected to return to active service, into vessel classes. All other vessels, including vessels retired and removed from service, are evaluated for impairment on a vessel by vessel basis. During the year ended December 31, 2024 , the Company recorded impairment charges of $ 3.7 million for other equipment designated for a construction project that was indefinitely deferred and will no longer be completed. During the year ended December 31, 2023 , the Company recorded impairment charges totaling $ 0.7 million for one leased-in AHTS to adjust for indicative future cash flows and the cost to return the vessel to its owner. During the year ended December 31, 2022, the Company recorded impairment charges totaling $ 2.9 million that consisted of $ 0.9 million for one FSV classified as held for sale and sold during 2022, $ 0.7 million for one leased-in AHTS to adjust for indicative future cash flows and the cost to return the vessel to its owner, and $ 1.3 million for other equipment classified as held for sale and sold during 2023. The impairment charges for the assets held for sale are included in gains (losses) on asset dispositions and impairments in the accompanying consolidated statements of income (loss). There were no impairments of other owned or leased-in vessels. For vessel classes and individual vessels with indicators of impairment as of December 31, 2024, the Company estimated that their future undiscounted cash flows exceeded their current carrying values. However, the Company’s estimates of future undiscounted cash flows are highly subjective as utilization and rates per day worked are uncertain, especially in light of the continued volatility in commodity prices as well as the timing and cost of reactivating cold-stacked vessels. If market conditions decline, changes in the Company’s expectations on future cash flows may result in recognizing additional impairment charges related to its long-lived assets in future periods. For any vessel or vessel class that has indicators of impairment and is deemed not recoverable through future operations, the Company determines the fair value of the vessel or vessel class. If the fair value determination is less than the carrying value of the vessel or vessel class, an impairment is recognized to reduce the carrying value to fair value. Fair value determination is primarily accomplished by obtaining independent valuations of vessel or vessel classes from qualified third party appraisers. Impairment of 50% or Less Owned Companies. Investments in 50% or less owned companies are reviewed periodically to assess whether there is an other-than-temporary decline in the carrying value of the investment. In its evaluation, the Company considers, among other items, recent and expected financial performance and returns, impairments recorded by the investee and the capital structure of the investee. When the Company determines the estimated fair value of an investment is below carrying value and the decline is other-than-temporary, the investment is written down to its estimated fair value. Actual results may vary from the Company’s estimates due to the uncertainty regarding projected financial performance, the severity and expected duration of declines in value and the available liquidity in the capital markets to support the continuing operations of the investee, among other factors. Although the Company believes its assumptions and estimates are reasonable, the investee’s actual performance compared with the estimates could produce different results and lead to additional impairment charges in future periods. No impairment charges of investments in 50% or less owned companies were incurred for the years ended December 31, 2024, 2023 and 2022 .
Business Combinations	Business Combinations. For acquisitions constituting a business acquisition, the Company recognizes 100% of the fair value of assets acquired, liabilities assumed, and noncontrolling interests when the acquisition constitutes a change in control of the acquired entity. Shares issued in consideration for a business combination, contingent consideration arrangements and pre-acquisition loss and gain contingencies are all measured and recorded at their acquisition-date fair value. Subsequent changes to fair value of contingent consideration arrangements are generally reflected in earnings. Acquisition-related transaction costs are expensed as incurred and any changes in an acquirer’s existing income tax valuation allowances and tax uncertainty accruals are recorded as an adjustment to income tax expense. The operating results of entities acquired are included in the accompanying consolidated statements of income (loss) from the date of acquisition. If an acquisition of an asset or group of assets does not meet the definition of a business, the transaction is accounted for as an asset acquisition. The assets are measured based on their cost to the Company, including transaction costs. The acquisition cost is then allocated to the assets acquired based on their relative fair values.
Debt Discount and Issuance Costs	Debt Discount and Issuance Costs . Debt discounts and costs incurred in connection with the issuance of debt are amortized over the life of the related debt using the effective interest rate method for term loans and straight-line method for revolving credit facilities and are included in interest expense in the accompanying consolidated statements of income (loss).
Self-insurance Liabilities	Self-insurance Liabilities . The Company maintains marine hull, liability and war risk, general liability, workers compensation and other insurance customary in the industry in which it operates. Both the marine hull and liability policies have annual aggregate deductibles. Marine hull annual aggregate deductibles are accrued as claims are incurred while marine liability annual aggregate deductibles are accrued based on historical loss experience. Exposure to the health benefit plans are limited by maintaining stop-loss and aggregate liability coverage. To the extent that estimated self-insurance losses, including the accrual of annual aggregate deductibles, differ from actual losses realized, the Company’s insurance reserves could differ significantly and may result in either higher or lower insurance expense in future periods.
Income Taxes	Income Taxes . Deferred income tax assets and liabilities have been provided in recognition of the income tax effect attributable to the book and tax basis differences of assets and liabilities reported in the consolidated financial statements. Deferred tax assets or liabilities are provided using the enacted tax rates expected to apply to taxable income in the periods in which they are expected to be settled or realized. Interest and penalties relating to uncertain tax positions are recognized in interest expense and administrative and general, respectively, in the accompanying consolidated statements of income (loss). The Company records a valuation allowance to reduce its deferred tax assets if it is more likely than not that some portion or all of the deferred tax assets will not be realized. The Global Intangible Low Taxed Income (“GILTI”) regime effectively imposes a minimum tax on worldwide foreign earnings and subjects U.S. shareholders of controlled foreign corporations (“CFCs”) to current taxation on certain income earned through a CFC. The Company has made the policy election to record any liability associated with GILTI in the period in which it is incurred. In the normal course of business, the Company may be subject to challenges from tax authorities regarding the amount of taxes due for the Company. These challenges may alter the timing or amount of taxable income or deductions. As part of the calculation of income tax expense, the Company determines whether the benefits of its tax positions are at least more likely than not of being sustained based on the technical merits of the tax position. For tax positions that are more likely than not of being sustained, the Company accrues the largest amount of the tax benefit that is more likely than not of being sustained. Such accruals require management to make estimates and judgments with respect to the ultimate outcome of its tax benefits and actual results could vary materially from these estimates. The Company is subject to federal and state income tax and foreign withholding tax audits from time to time that could result in proposed assessments. Management believes that the Company has appropriately accounted for income and withholding taxes for tax periods that are within the statutory period of limitations not previously audited and that are potentially open for examination by the taxing authorities. The Company cannot predict with certainty how any audits would be resolved and whether the Company will be required to make additional tax payments, which may include penalties and interest. The Company is subject to examination for the preceding eight years.
Foreign Currency Translation	Foreign Currency Translation. The assets, liabilities and results of operations of certain consolidated subsidiaries are measured using their functional currency, which is the currency of the primary foreign economic environment in which they operate. Upon consolidating these subsidiaries with the Company, their assets and liabilities are translated to U.S. dollars at currency exchange rates as of the consolidated balance sheet dates and their revenues and expenses are translated at the weighted average currency exchange rates during the applicable reporting periods. Translation adjustments resulting from the process of translating these subsidiaries’ financial statements are reported in other comprehensive income in the accompanying consolidated statements of comprehensive income (loss). Foreign Currency Transactions. Certain consolidated subsidiaries enter into transactions denominated in currencies other than their functional currency. Gains and losses resulting from changes in currency exchange rates between the functional currency and the currency in which a transaction is denominated are included in foreign currency losses, net in the accompanying consolidated statements of income (loss) in the period in which the currency exchange rates change.
Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) Income. The components of accumulated other comprehensive (loss) income were as follows (in thousands): SEACOR Marine Holdings Inc. Noncontrolling Interests Foreign Derivative (Losses) Gains on Cash Flow Total Foreign Derivative Other Year Ended December 31, 2021 $ 10,783 $ ( 2,728 ) $ 8,055 $ ( 1,445 ) $ ( 11 ) $ 5,265 Other comprehensive loss ( 4,451 ) 3,243 ( 1,208 ) — — ( 1,208 ) Income tax (expense) — — — — — — Year Ended December 31, 2022 6,332 515 6,847 ( 1,445 ) ( 11 ) $ ( 1,208 ) Other comprehensive income 1,245 ( 515 ) 730 — — $ 730 Income tax benefit (expense) — — — — — — Year Ended December 31, 2023 7,577 — 7,577 ( 1,445 ) ( 11 ) $ 730 Other comprehensive loss ( 436 ) — ( 436 ) — — ( 436 ) Income tax benefit (expense) — — — — — — Year Ended December 31, 2024 $ 7,141 $ — $ 7,141 $ ( 1,445 ) $ ( 11 ) $ ( 436 )
Earnings (Loss) Per Share	Earnings (Loss) Per Share. Basic earnings/loss per share of the common stock, par value $ 0.01 per share, of SEACOR Marine (“Common Stock”) is computed based on the weighted average number of shares of Common Stock and warrants to purchase Common Stock at an exercise price of $ 0.01 per share (“Warrants”) issued and outstanding during the relevant periods. The Warrants are included in the basic earnings/loss per share of Common Stock because the shares issuable upon exercise of the Warrants are issuable for de minimis cash consideration and therefore not anti-dilutive. Diluted earnings/loss per share of Common Stock is computed based on the weighted average number of shares of Common Stock and Warrants issued and outstanding plus the effect of other potentially dilutive securities through the application of the treasury stock method and the if-converted method that assumes all shares of Common Stock have been issued and outstanding during the relevant periods pursuant to the conversion of the New Convertible Notes (as defined in “Note 5. Long-Term Debt”) unless anti-dilutive. As of December 31, 2024, the Company no longer has New Convertible Notes as a result of the completion of the 2024 SMFH Credit Facility agreement (as defined in “Note 5. Long-Term Debt”). For the years ended December 31, 2023 and 2022, diluted loss per share of Common Stock excluded 2,978,274 shares of Common Stock issuable upon the conversion of the New Convertible Notes as the effect of their inclusion in the computation would be anti-dilutive. In addition, for the years ended December 31, 2024, 2023 and 2022 , diluted (loss) earnings per share of Common Stock excluded 1,392,226 , 1,642,084 and 1,682,193 shares of restricted stock, respectively, and 1,013,865 , 1,026,031 and 1,026,865 shares of Common Stock, respectively, issuable upon exercise of outstanding stock options, as the effect of their inclusion in the computation would be anti-dilutive. In 2024, 2023 and 2022 , the Company issued 202,905 , 156,620 and 184,930 performance share awards, of which 326,597 were not considered outstanding as of December 31, 2024 . These performance share awards are not considered outstanding until such time as they would be probable of being exercised, therefore they were not included in the computation of earnings (loss) per share.
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards. On November 27, 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which requires public entities to disclose information about their reportable segments’ significant expenses on an interim and annual basis. The guidance is effective for fiscal years beginning after December 15, 2023 and interim periods within the fiscal years beginning after December 15, 2024. The adoption of the standard did not have a material effect on the Company’s consolidated financial position, results of operations and disclosures.
Recently Issued Accounting Standards	Recently Issued Accounting Standards. On December 14, 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which requires public entities to disclose information about their effective tax rate reconciliation and information on income taxes paid. The guidance is effective for fiscal years beginning after December 15, 2024. While early adoption is permitted, the Company has determined it will not early adopt the standard. The Company has not yet determined the impact that the adoption of the standard will have on the Company’s consolidated financial position, results of operations and disclosures. On October 9, 2023, the FASB issued ASU 2023-06, Disclosure Improvements: Codification Amendments in Response to the United States Securities and Exchange Commission’s (“SEC”) Disclosure Update and Simplification Initiative, which amends the disclosure or presentation requirements related to various subtopics in the FASB Accounting Standards Codification. The effective date is contingent on when the SEC removes the related disclosure from Regulation S-X or Regulation S-K, with early adoption prohibited. The Company does not believe the adoption of the standard will have a material effect on the Company’s consolidated financial position, results of operations and disclosures.

Nature of Operations and Acco_3

Nature of Operations and Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2024
Nature Of Operation And Accounting Policies [Abstract]
Schedule of Deferred Revenues	Revenue that does not meet these criteria is deferred until the criteria is met and is considered a contract liability and is recognized as such. Contract liabilities, which are included in unearned revenue in the accompanying consolidated balance sheets, for the years ended December 31 were as follows (in thousands): 2024 2023 2022 Balance at beginning of year $ 687 $ 2,333 $ 1,606 Unearned revenues during the year 6,689 6,501 4,288 Revenues recognized during the year ( 4,842 ) ( 8,147 ) ( 3,561 ) Balance at end of year $ 2,534 $ 687 $ 2,333
Schedule Of Cash Cash Equivalents And Restricted Cash From Continuing Operations	For the years ended December 31, cash, cash equivalents and restricted cash consists of (in thousands): 2024 2023 Cash $ 59,491 $ 67,455 Restricted cash 16,649 16,676 Total $ 76,140 $ 84,131
Schedule of Allowance for Credit Loss Reserves	Allowance for credit loss reserves for the years ended December 31 were as follows (in thousands): Description Balance Reserves Acquired Charges Deductions Balance Year Ended December 31, 2024 Allowance for credit loss reserves (deducted from trade and notes receivable) $ 4,543 $ — $ 202 $ — $ 4,745 Year Ended December 31, 2023 Allowance for credit loss reserves (deducted from trade and notes receivable) $ 1,650 $ — $ 3,519 $ ( 626 ) $ 4,543 Year Ended December 31, 2022 Allowance for credit loss reserves (deducted from trade and notes receivable) $ 1,312 $ — $ 489 $ ( 151 ) $ 1,650
Summary of Property and Equipment from Continuing Operations	The Company’s property and equipment as of December 31 was as follows (in thousands): Historical (1) Accumulated Net Book 2024 Offshore support vessels: AHTS (2) $ 948 $ ( 825 ) $ 123 FSV (3) 344,833 ( 160,823 ) 184,010 PSV (4) 290,416 ( 66,478 ) 223,938 Liftboats 243,295 ( 118,923 ) 124,372 General machinery and spares 9,394 ( 9,248 ) 146 Other (5) 11,528 ( 11,151 ) 377 $ 900,414 $ ( 367,448 ) $ 532,966 2023 Offshore support vessels: AHTS (2) $ 12,112 $ ( 4,578 ) $ 7,534 FSV (3) 340,411 ( 142,096 ) 198,315 PSV (4) 301,461 ( 53,100 ) 248,361 Liftboats 243,295 ( 103,459 ) 139,836 General machinery and spares 9,343 ( 9,161 ) 182 Other (5) 12,201 ( 11,747 ) 454 $ 918,823 $ ( 324,141 ) $ 594,682 (1) Includes property and equipment acquired in business acquisitions at acquisition date fair value and net of the impact of recognized impairment charges. Most of the Company’s vessels are pledged as collateral under the 2024 SMFH Credit Facility. (2) Anchor handling towing supply vessels (“AHTS”). (3) Fast support vessels (“FSVs”). (4) Platform support vessels (“PSVs”). (5) Includes buildings, leasehold improvements, vehicles and other property and equipment.
Schedule of Accumulated Other Comprehensive (Loss) Income	Accumulated Other Comprehensive (Loss) Income. The components of accumulated other comprehensive (loss) income were as follows (in thousands): SEACOR Marine Holdings Inc. Noncontrolling Interests Foreign Derivative (Losses) Gains on Cash Flow Total Foreign Derivative Other Year Ended December 31, 2021 $ 10,783 $ ( 2,728 ) $ 8,055 $ ( 1,445 ) $ ( 11 ) $ 5,265 Other comprehensive loss ( 4,451 ) 3,243 ( 1,208 ) — — ( 1,208 ) Income tax (expense) — — — — — — Year Ended December 31, 2022 6,332 515 6,847 ( 1,445 ) ( 11 ) $ ( 1,208 ) Other comprehensive income 1,245 ( 515 ) 730 — — $ 730 Income tax benefit (expense) — — — — — — Year Ended December 31, 2023 7,577 — 7,577 ( 1,445 ) ( 11 ) $ 730 Other comprehensive loss ( 436 ) — ( 436 ) — — ( 436 ) Income tax benefit (expense) — — — — — — Year Ended December 31, 2024 $ 7,141 $ — $ 7,141 $ ( 1,445 ) $ ( 11 ) $ ( 436 )

Equipment Acquisitions and Di_2

Equipment Acquisitions and Dispositions (Tables)	12 Months Ended
	Dec. 31, 2024
Property, Plant and Equipment [Abstract]
Schedule of Vessel Acquired and Disposed	Deliveries of offshore support vessels for the years ended December 31 were as follows: 2024 2023 2022 FSV — 1 — PSV — — 1 — 1 1 Major equipment dispositions for the years ended December 31 were as follows: 2024 2023 2022 (1) AHTS 3 — 1 FSV — 1 1 PSV — — — Liftboats — 4 1 Specialty — 1 — 3 6 3 (1) Excludes one specialty vessel that was previously removed from service, which was sold in 2023.

Investments, at Equity, and A_2

Investments, at Equity, and Advances to 50% or Less Owned Companies (Tables)	12 Months Ended
	Dec. 31, 2024
Schedule of Investments [Abstract]
Equity Method Investments	Investments, at equity, and advances to 50% or less owned companies as of December 31 were as follows (in thousands): Ownership 2024 2023 Seabulk Angola 49.0 % 962 1,668 SEACOR Marine Arabia 45.0 % 2,508 2,385 Other 20.0 % — 50.0 % 71 72 $ 3,541 $ 4,125 Combined Condensed Financial Information of Other Investees. Summarized financial information of the Company’s other investees, at equity, as of and for the years ended December 31 was as follows (in thousands): 2024 2023 Current assets $ 29,405 $ 29,820 Noncurrent assets 110 61 Current liabilities 21,664 21,008 Noncurrent liabilities 12 — 2024 2023 2022 Operating Revenues $ 78,719 $ 68,949 $ 133,740 Costs and Expenses: Operating and administrative 69,741 61,294 90,678 Depreciation 21 27 21,434 69,762 61,321 112,112 Operating Income $ 8,957 $ 7,628 $ 21,628 Net Income $ 7,464 $ 5,239 $ 15,057
Schedule of Gain on Sale of Equity Investments	The Company recognized a gain on the sale of MexMar, OVH and other assets of approximately $ 0.8 million, calculated as follows: September 29, 2022 Total Cash Received $ 66,000 51% ownership in SEACOR Marlin Joint Venture 7,000 Hybrid Battery Power System 1,394 Less: Transaction Fees and other Costs 1,159 Total Net Proceeds 73,235 Less: Net Equity in MexMar and OVH Joint Ventures 65,546 Less: Net Book Value of SEACOR Davis 5,507 Less: OVH Note Receivable 1,394 Gain on Sale of MexMar, OVH and Other Assets $ 788

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2024
Leases [Abstract]
Summary of Future Minimum Payments For Leases	As of December 31, 2024, future minimum payments for leases for the years ended December 31 were as follows (in thousands): Operating Leases Finance Leases 2025 $ 806 $ 20 2026 474 13 2027 400 9 2028 341 — 2029 341 — Years subsequent to 2029 2,531 — 4,893 42 Interest component ( 1,305 ) ( 5 ) 3,588 37 Current portion of long-term lease liabilities 606 17 Long-term lease liabilities $ 2,982 $ 20
Summary of Components of Leases Expense	For the years ended December 31, the components of lease expense were as follows (in thousands): 2024 2023 Operating lease costs $ 1,216 $ 2,222 Finance lease costs: Amortization of finance lease assets (1) 44 468 Interest on finance lease liabilities (2) 3 202 Short-term lease costs 462 526 $ 1,725 $ 3,418 (1) Included in amortization costs in the consolidated statements of income (loss). (2) Included in interest expense in the consolidated statements of income (loss).
Summary of Supplemental Cash Flow Information Related to Leases	For the year ended December 31, 2024, supplemental cashflow information related to leases were as follows (in thousands): 2024 Operating cash flows from operating leases $ 1,841 Financing cash outflows from finance leases 41 Right-of-use assets obtained for operating lease liabilities — Right-of-use assets obtained for finance lease liabilities 34
Summary of Other Information Related to Leases	For the year ended December 31, 2024, other information related to leases were as follows: 2024 Weighted average remaining lease term, in years - operating leases 11.7 Weighted average remaining lease term, in years - finance leases 2.3 Weighted average discount rate - operating leases 6.2 % Weighted average discount - finance leases 10.0 %

Long-term Debt (Tables)

Long-term Debt (Tables)	12 Months Ended
	Dec. 31, 2024
Debt Disclosure [Abstract]
Schedule of Long-term Debt Obligations	The Company’s long-term debt obligations as of December 31 were as follows (in thousands): 2024 2023 2024 SMFH Credit Facility (1) $ 350,000 $ — Guaranteed Notes (1) — 90,000 New Convertible Notes (1) — 35,000 2023 SMFH Credit Facility (1) — 118,950 Sea-Cat Crewzer III Term Loan Facility (1) — 14,227 SEACOR Delta Shipyard Financing (1) — 68,647 SEACOR Alpine Credit Facility (1) — 26,200 Total principal due for long-term debt 350,000 353,024 Current portion due within one year ( 27,500 ) ( 28,365 ) Unamortized debt discount ( 4,338 ) ( 32,885 ) Deferred issuance costs ( 823 ) ( 4,230 ) Long-term debt, less current portion $ 317,339 $ 287,544 (1) Proceeds from the 2024 SMFH Credit Facility, dated November 27, 2024, were used to satisfy in full the Guaranteed Notes, the New Convertible Notes, the 2023 SMFH Credit Facility, the Sea-Cat Crewzer III Term Loan Facility, the SEACOR Delta Shipyard Financing, and the SEACOR Alpine Credit Facility. See details below.
Schedule of Long-term Debt Maturities	The Company’s contractual long-term debt maturities for the years ended December 31 were as follows (in thousands): 2025 $ 27,500 2026 30,000 2027 30,000 2028 30,000 2029 232,500 Years subsequent to 2029 — $ 350,000
Schedule of Debt Extinguishment	During the year ended December 31, 2024, the Company recognized a loss on debt extinguishment of $ 31.9 million calculated as follows (in thousands): Unamortized Debt Discount: Guaranteed Notes $ 5,599 New Convertible Notes 2,340 2023 SMFH Credit Facility 1,550 SEACOR Delta Shipyard Financing 15,654 25,143 Deferred Issuance Costs: Guaranteed Notes 760 New Convertible Notes 287 2023 SMFH Credit Facility 512 Sea-Cat Crewzer III Term Loan Facility 1,058 SEACOR Alpine Credit Facility 492 3,109 Debt Prepayment Fees: 2023 SMFH Credit Facility 3,294 Sea-Cat Crewzer III Term Loan Facility 42 SEACOR Alpine Credit Facility 218 3,554 Third Party Fees 117 Loss on Debt Extinguishment $ 31,923

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2024
Income Tax Disclosure [Abstract]
Schedule of Loss before Income Tax (Benefit) Expense, Domestic and Foreign	Loss before income tax (benefit) expense and equity in earnings of 50 % or less owned companies derived from U.S. and foreign companies for the years ended December 31 were as follows (in thousands): 2024 2023 2022 United States $ ( 67,632 ) $ ( 3,576 ) $ ( 48,037 ) Foreign ( 15,255 ) ( 335 ) ( 21,881 ) Eliminations ( 160 ) ( 160 ) ( 160 ) $ ( 83,047 ) $ ( 4,071 ) $ ( 70,078 )
Schedule of Components of Income Tax (Benefit) Expense	The components of income tax (benefit) expense for the years ended December 31 were as follows (in thousands): 2024 2023 2022 Current: Federal $ — $ ( 18 ) $ 90 State ( 44 ) 47 ( 78 ) Foreign 11,111 13,831 8,473 11,067 13,860 8,485 Deferred: Federal ( 13,629 ) ( 5,062 ) 7 State ( 53 ) 8 90 Foreign — ( 7 ) — ( 13,682 ) ( 5,061 ) 97 $ ( 2,615 ) $ 8,799 $ 8,582
Schedule of Effective Income Tax Rate Reconciliation	The following table reconciles the difference between the statutory federal income tax rate for the Company and the effective income tax rate for the years ended December 31: 2024 2023 2022 Statutory rate ( 21.0 )% ( 21.0 )% ( 21.0 )% Income (loss) of foreign subsidiaries not includable in U.S. return and foreign withholding tax 15.9 % 223.4 % 20.8 % Non-Deductible Expenses 0.1 % 1.2 % 0.3 % JV equity earnings — % — % — % Sale of investments in 50 % or less owned companies — % — % 11.1 % 162(m) - Executive compensation 1.8 % 17.8 % — % Return to provision — % — % — % State Taxes ( 0.1 )% 1.1 % — % Subpart F Income and GILTI 1.3 % 6.6 % 0.7 % Share Award Plans ( 1.1 )% ( 12.9 )% 0.3 % Other — % — % 0.1 % Effective Tax Rate ( 3.1 )% 216.2 % 12.3 %
Schedule of Deferred Tax Assets and Liabilities	The components of net deferred income tax liabilities as of December 31 were as follows (in thousands): 2024 2023 Deferred tax liabilities: Property and equipment $ 43,732 $ 48,779 Other 684 3,533 Total deferred tax liabilities 44,416 52,312 Deferred tax assets: Federal net operating loss carryforwards 16,501 10,887 Foreign tax credits 4,283 4,282 Deferred state taxes 1,934 1,894 Other 4,573 4,456 27,291 21,519 Valuation allowance ( 4,912 ) ( 4,925 ) Total deferred tax assets 22,379 16,594 Net deferred tax liabilities $ 22,037 $ 35,718

Derivative Instruments and He_2

Derivative Instruments and Hedging Strategies (Tables)	12 Months Ended
	Dec. 31, 2024
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Fair Value of Derivative Assets and Liabilities	The fair values of the Company’s derivative instruments as of December 31 were as follows (in thousands): 2024 2023 Derivative Derivative Derivative Derivative Derivatives not designated as hedging instruments: Forward Exchange Contract $ — $ 464 $ 608 $ —
Effect of Derivative Instruments on Other Comprehensive Income (Loss)	The following tables reflect amounts recorded in Other Comprehensive Income (Loss) (“OCI”) and amounts reclassified from OCI to revenue and expense for the periods indicated: Gains (Losses) Recognized in OCI on Derivatives Derivatives in Cash Flow Hedging Relationships 2024 2023 2022 Interest rate swap contracts $ — $ 56 $ 1,608 Joint venture interest rate swap contracts — — 941 (Gains) Losses Reclassified from OCI into Income Location of (Gains) Losses 2024 2023 2022 Interest expense $ — $ ( 571 ) $ 694
Schedule of Gains (Losses) on Derivative Instruments not Designated as Hedging Instruments	The Company had no derivative instruments not designated as hedging instruments for the year ended December 31, 2022 and recognized (losses) gains on derivative instruments not designated as hedging instruments for the years ended December 31, 2024 and 2023 as follows (in thousands): Derivative gains (losses), net 2024 2023 2022 Forward currency exchange, option and future contracts $ ( 908 ) $ 608 $ —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2024
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis	The Company’s financial assets and liabilities as of December 31 that are measured at fair value on a recurring basis were as follows (in thousands): Level 1 Level 2 Level 3 2024 LIABILITIES Derivative instruments $ — $ 464 $ — 2023 ASSETS Derivative instruments $ — $ 608 $ —
Schedule of Estimated Fair Values of Financial Assets and Liabilities	The estimated fair values of the Company’s other financial assets and liabilities as of December 31 were as follows (in thousands): Estimated Fair Value Carrying Level 1 Level 2 Level 3 2024 LIABILITIES Long-term debt, including current portion 344,839 — 345,662 — 2023 LIABILITIES Long-term debt, including current portion 315,909 — 307,653 —

Noncontrolling Interests in S_2

Noncontrolling Interests in Subsidiaries (Tables)	12 Months Ended
	Dec. 31, 2024
Noncontrolling Interest [Abstract]
Schedule of Noncontrolling Interests in the Company's Consolidated Subsidiaries	Noncontrolling interests in the Company’s consolidated subsidiaries as of December 31 were as follows (in thousands): Noncontrolling 2024 2023 VEESEA Holdings Inc. 1.8 % $ 321 $ 321

Stock Based Compensation (Table

Stock Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2024
Share-Based Payment Arrangement [Abstract]
Schedule of Equity Incentive Plan Transactions	Transactions in connection with the Company’s Equity Incentive Plans during the years ended December 31 were as follows: 2024 2023 2022 Director Stock Awards Granted 43,504 60,938 60,787 Restricted Stock Activity: Outstanding as of the beginning of year (1) 1,642,084 1,682,193 1,163,090 Granted 637,698 660,307 1,036,605 Vested (2) ( 887,556 ) ( 685,416 ) ( 514,002 ) Forfeited — ( 15,000 ) ( 3,500 ) Outstanding as of the end of year (3) 1,392,226 1,642,084 1,682,193 Stock Option Activity: Outstanding as of the beginning of year 1,026,031 1,026,865 1,061,357 Granted — — — Exercised (4) ( 12,166 ) ( 834 ) ( 34,492 ) Forfeited — — — Outstanding as of the end of year 1,013,865 1,026,031 1,026,865 (1) Includes 342,385 , 268,413 and 31,491 grants of performance-based restricted stock units as of December 31, 2023, 2022 and 2021, respectively, that satisfied the performance obligation and are therefore likely to vest. Excludes 156,620 , 216,172 and 354,964 grants of performance-based restricted stock units as of December 31, 2023, 2022 and 2021, respectively, that are not considered outstanding until such time that they become probable to vest. (2) Includes 157,455 , 73,972 and 236,922 vested grants of performance-based restricted stock units as of December 31, 2024, 2023 and 2022, respectively. (3) Includes 215,853 , 342,385 and 268,413 grants of performance-based restricted stock units as of December 31, 2024, 2023 and 2022, respectively, that satisfied the performance obligation and are therefore likely to vest. Excludes 326,597 , 156,620 and 216,172 grants of performance-based restricted stock units as of December 31, 2024, 2023 and 2022, respectively, that are not considered outstanding until such time that they become probable to vest. (4) The intrinsic value of the options exercised was less than $ 0.1 million.
Schedule of Restricted Stock Transactions	During the year ended December 31, 2024, the number of shares and the weighted average grant price of restricted stock transactions were as follows: Restricted Stock Number of Weighted Average Non-Vested as of December 31, 2023 1,642,084 $ 7.53 Granted 637,698 12.03 Vested ( 887,556 ) 12.28 Forfeited — — Non-Vested as of December 31, 2024 1,392,226 10.40
Schedule of Stock Option Transactions	During the year ended December 31, 2024, the number of shares and the weighted average exercise price on stock option transactions were as follows: Stock Options Number of Weighted Average Outstanding as of December 31, 2023 1,026,031 $ 12.66 Granted — — Exercised ( 12,166 ) 11.48 Forfeited — — Outstanding as of December 31, 2024 (1) 1,013,865 12.68 Exercisable as of December 31, 2024 (2) 1,013,865 12.68 (1) The weighted average remaining contractual term is 3.8 years and the intrinsic value of the options exercised was $ 0.4 million. (2) The weighted average remaining contractual term is 3.8 years and the intrinsic value of the options exercisable was $ 0.4 million.

Major Customers and Segment I_2

Major Customers and Segment Information (Tables)	12 Months Ended
	Dec. 31, 2024
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	The following tables summarize the operating results, capital expenditures and assets of the Company’s reportable segments for the periods indicated (in thousands): United States Africa and Europe Middle East Latin Total For the year ended December 31, 2024 Operating Revenues: Time charter $ 31,991 $ 99,410 $ 70,346 $ 52,573 $ 254,320 Bareboat charter — — — 1,464 1,464 Other marine services 3,808 5,272 1,979 4,518 15,577 35,799 104,682 72,325 58,555 271,361 Direct Costs and Expenses: Operating: Personnel 24,459 21,887 24,132 15,063 85,541 Repairs and maintenance 6,618 13,537 13,047 7,183 40,385 Drydocking 8,604 4,774 2,796 5,277 21,451 Insurance and loss reserves 2,992 2,329 3,147 1,426 9,894 Fuel, lubes and supplies 3,351 7,197 4,184 5,215 19,947 Other 509 12,723 4,425 2,377 20,034 46,533 62,447 51,731 36,541 197,252 Direct Vessel (Loss) Profit $ ( 10,734 ) $ 42,235 $ 20,594 $ 22,014 $ 74,109 Other Costs and Expenses: Lease expense $ 555 $ 507 $ 301 $ 315 1,678 Administrative and general 44,713 Depreciation and amortization 12,334 17,497 13,276 8,521 51,628 98,019 Gains on asset dispositions and impairments, net 13,481 Operating loss $ ( 10,429 ) As of December 31, 2024 Property and Equipment: Historical cost $ 195,756 $ 325,000 $ 240,075 $ 139,583 $ 900,414 Accumulated depreciation ( 104,771 ) ( 121,320 ) ( 97,908 ) ( 43,449 ) ( 367,448 ) $ 90,985 $ 203,680 $ 142,167 $ 96,134 $ 532,966 Total Assets (1) $ 120,347 $ 241,278 $ 174,410 $ 117,475 $ 653,510 (1) Total Assets exclude $ 73.6 million of corporate assets. United States Africa and Europe Middle East Latin America Total For the year ended December 31, 2023 Operating Revenues: Time charter $ 41,850 $ 87,729 $ 66,407 $ 55,399 $ 251,385 Bareboat charter — — — 1,460 1,460 Other marine services 17,678 2,582 4,345 2,061 26,666 59,528 90,311 70,752 58,920 279,511 Direct Costs and Expenses: Operating: Personnel 26,110 20,434 20,786 14,440 81,770 Repairs and maintenance 5,146 9,624 7,109 4,947 26,826 Drydocking 2,314 2,946 ( 99 ) 1,437 6,598 Insurance and loss reserves 3,752 1,727 3,638 839 9,956 Fuel, lubes and supplies 3,697 6,830 3,552 3,108 17,187 Other 1,427 10,072 3,961 1,853 17,313 42,446 51,633 38,947 26,624 159,650 Direct Vessel Profit $ 17,082 $ 38,678 $ 31,805 $ 32,296 $ 119,861 Other Costs and Expenses: Lease expense $ 536 $ 1,498 $ 360 $ 354 2,748 Administrative and general 49,183 Depreciation and amortization 14,685 15,346 14,760 9,030 53,821 105,752 Gains on asset dispositions and impairments, net 21,409 Operating income $ 35,518 As of December 31, 2023 Property and Equipment: Historical cost $ 209,262 $ 272,272 $ 267,079 $ 170,210 $ 918,823 Accumulated depreciation ( 99,137 ) ( 93,045 ) ( 94,708 ) ( 37,251 ) ( 324,141 ) $ 110,125 $ 179,227 $ 172,371 $ 132,959 $ 594,682 Total Assets (1) $ 142,264 $ 215,158 $ 199,174 $ 152,427 $ 709,023 (1) Total Assets exclude $ 71.3 million of corporate assets. United States Africa and Europe Middle East Latin America Total For the year ended December 31, 2022 Operating Revenues: Time charter $ 51,272 $ 60,060 $ 52,080 $ 40,122 $ 203,534 Bareboat charter — — — 1,374 1,374 Other marine services 9,528 ( 163 ) 762 2,290 12,417 60,800 59,897 52,842 43,786 217,325 Direct Costs and Expenses: Operating: Personnel 25,201 16,436 22,376 13,769 77,782 Repairs and maintenance 7,049 9,229 8,111 7,107 31,496 Drydocking 8,978 2,339 6,569 274 18,160 Insurance and loss reserves 4,831 1,178 2,838 1,115 9,962 Fuel, lubes and supplies 3,345 8,022 5,089 2,833 19,289 Other 1,235 7,175 4,633 2,253 15,296 50,639 44,379 49,616 27,351 171,985 Direct Vessel Profit $ 10,161 $ 15,518 $ 3,226 $ 16,435 $ 45,340 Other Costs and Expenses: Lease expense $ 998 $ 1,691 $ 156 $ 1,024 3,869 Administrative and general 40,911 Depreciation and amortization 17,444 13,708 16,331 8,474 55,957 100,737 Gains on asset dispositions and impairments, net 1,398 Operating loss $ ( 53,999 ) As of December 31, 2022 Property and Equipment: Historical cost $ 232,740 $ 285,303 $ 286,745 $ 162,895 $ 967,683 Accumulated depreciation ( 101,503 ) ( 92,030 ) ( 89,444 ) ( 27,801 ) ( 310,778 ) $ 131,237 $ 193,273 $ 197,301 $ 135,094 $ 656,905 Total Assets (1) $ 174,081 $ 211,371 $ 215,497 $ 150,650 $ 751,599 (1) Total Assets exclude $ 64.0 million of corporate assets.

Nature of Operations and Acco_4

Nature of Operations and Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2024 USD ($) Vessel Segment $ / shares shares	Dec. 31, 2023 USD ($) $ / shares shares	Dec. 31, 2022 USD ($) $ / shares shares	Oct. 05, 2022 $ / shares	Dec. 31, 2021 USD ($) shares
Nature Of Operations And Accounting Policies [Line Items]
Number of reportable segments | Segment	4
Revenues	$ 271,361,000	$ 279,511,000	$ 217,325,000
Unearned revenue	2,534,000	687,000	2,333,000		$ 1,606,000
Restricted cash	16,649,000	16,676,000
Inventory reserves	0	0	0
Capitalized interest costs, including allowance for funds used during construction, total	0	0	0
Impairment of long-lived assets held-for-use	$ 3,700,000		$ 2,900,000
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]	Gain (Loss) on Sale of Assets and Asset Impairment Charges		Gain (Loss) on Sale of Assets and Asset Impairment Charges
Assets held for sale	$ 10,943,000	500,000
Equity method investment, other than temporary impairment	0	0	$ 0
Long-term Debt, Gross	$ 350,000,000	$ 353,024,000
Class of warrant or right, exercise price of warrants or rights | $ / shares	$ 0.01			$ 0.01
Earnings (loss) per share | $ / shares	$ (2.82)	$ (0.34)	$ (2.69)
Sales Revenue, Net | Geographic Concentration Risk | Azule Energy Angola S p A
Nature Of Operations And Accounting Policies [Line Items]
Revenues	$ 57,600,000		$ 42,400,000
Concentration risk, percentage	21%		15%
Sales Revenue, Net | Customer Concentration Risk | Seacor Marine Arabia
Nature Of Operations And Accounting Policies [Line Items]
Revenues	$ 51,000,000	$ 43,200,000	$ 30,100,000
Concentration risk, percentage	19%	15%	14%
Operating Revenues
Nature Of Operations And Accounting Policies [Line Items]
Business interruption insurance recoveries	$ 0	$ 10,000,000	$ 1,900,000
Accounting Standards Update 2023-07
Nature Of Operations And Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted [true false]	true
Change in accounting principle, accounting standards update, immaterial effect [true false]	true
Performance Share Awards
Nature Of Operations And Accounting Policies [Line Items]
Number of shares issued | shares	202,905	156,620	184,930
Number of shares outstanding | shares	326,597	156,620	216,172		354,964
Restricted Stock
Nature Of Operations And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount | shares	1,392,226	1,642,084	1,682,193
Employee Stock Option
Nature Of Operations And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount | shares	1,013,865	1,026,031	1,026,865
Convertible Debt Securities
Nature Of Operations And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of earnings per share, amount | shares		2,978,274	2,978,274
Fast Support Vessel
Nature Of Operations And Accounting Policies [Line Items]
Impairment charges			$ 900,000
Anchor Handling Towing Supply
Nature Of Operations And Accounting Policies [Line Items]
Impairment of long-lived assets held-for-use		$ 700,000	700,000
Tower and Gangway
Nature Of Operations And Accounting Policies [Line Items]
Impairment charges			1,300,000
Continuing Operations
Nature Of Operations And Accounting Policies [Line Items]
Depreciation, total	$ 51,600,000	53,800,000	56,000,000
Offshore Support Vessels
Nature Of Operations And Accounting Policies [Line Items]
Estimated useful life (Year)	20 years
2024 SMFH Credit Facility
Nature Of Operations And Accounting Policies [Line Items]
Restricted cash	$ 16,000,000
Long-term Debt, Gross	350,000,000	0
New Convertible Notes
Nature Of Operations And Accounting Policies [Line Items]
Long-term Debt, Gross	0	35,000,000
Trade and Other Receivables | Sales Revenue, Net | Geographic Concentration Risk | Azule Energy Angola S p A
Nature Of Operations And Accounting Policies [Line Items]
Revenues	$ 18,300,000	$ 11,900,000
Concentration risk, percentage	26%	18%
Trade and Other Receivables | Sales Revenue, Net | Customer Concentration Risk | Seacor Marine Arabia
Nature Of Operations And Accounting Policies [Line Items]
Revenues	$ 13,000,000	$ 14,400,000
Concentration risk, percentage	19%	22%
SEACOR Marlin LLC
Nature Of Operations And Accounting Policies [Line Items]
Equity method investment, ownership percentage	49%
Earnings (loss) per share | $ / shares	$ 0.01
Equity Investments in 50% or Less Owned Companies | Minimum
Nature Of Operations And Accounting Policies [Line Items]
Equity method investment, ownership percentage	20%
Equity Investments in 50% or Less Owned Companies | Minimum | SEACOR Marine Foreign Holdings
Nature Of Operations And Accounting Policies [Line Items]
Equity method investment, ownership percentage	50%
Equity Investments in 50% or Less Owned Companies | Maximum
Nature Of Operations And Accounting Policies [Line Items]
Equity method investment, ownership percentage	50%
SEACOR Marine Arabia
Nature Of Operations And Accounting Policies [Line Items]
Equity method investment, ownership percentage	45%
SEACOR Marine Arabia | Trade and Other Receivables
Nature Of Operations And Accounting Policies [Line Items]
Equity method investment, ownership percentage	45%
UNITED STATES
Nature Of Operations And Accounting Policies [Line Items]
Number of vessels owned | Vessel	10
Revenues	$ 35,799,000	$ 59,528,000	60,800,000
Assets held for sale	$ 5,400,000
Africa and Europe
Nature Of Operations And Accounting Policies [Line Items]
Number of vessels | Vessel	20
Number of vessels owned | Vessel	19
Number of vessels managed-in | Vessel	1
Revenues	$ 104,682,000	90,311,000	59,897,000
Middle East and Asia
Nature Of Operations And Accounting Policies [Line Items]
Number of vessels | Vessel	15
Number of vessels owned | Vessel	13
Number of vessels managed-in | Vessel	2
Revenues	$ 72,325,000	70,752,000	52,842,000
Assets held for sale	$ 5,500,000
Latin America
Nature Of Operations And Accounting Policies [Line Items]
Number of vessels owned | Vessel	9
Revenues	$ 58,555,000	$ 58,920,000	$ 43,786,000

Nature of Operations and Acco_5

Nature of Operations and Accounting Policies - Schedule Of Deferred Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Nature Of Operation And Accounting Policies [Abstract]
Balance at beginning of year	$ 687	$ 2,333	$ 1,606
Unearned revenues during the year	6,689	6,501	4,288
Revenues recognized during the year	(4,842)	(8,147)	(3,561)
Balance at end of year	$ 2,534	$ 687	$ 2,333

Nature of Operations and Acco_6

Nature of Operations and Accounting Policies - Schedule Of Cash, Cash Equivalents And Restricted Cash From Continuing Operations (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Nature Of Operation And Accounting Policies [Abstract]
Cash	$ 59,491	$ 67,455
Restricted cash	16,649	16,676
Total	$ 76,140	$ 84,131

Nature of Operations and Acco_7

Nature of Operations and Accounting Policies - Schedule of Allowance for Credit Loss Reserves (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Nature Of Operation And Accounting Policies [Abstract]
Balance Beginning of Year	$ 4,543	$ 1,650	$ 1,312
Reserves Acquired	0	0	0
Charges (Recoveries) to Cost and Expenses	202	3,519	489
Deductions	0	(626)	(151)
Balance End of Year	$ 4,745	$ 4,543	$ 1,650

Nature of Operations and Acco_8

Nature of Operations and Accounting Policies - Summary of Property and Equipment from Continuing Operations (Details) - USD ($) $ in Thousands		Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022
Historical cost		$ 900,414	[1]	$ 918,823	[1]	$ 967,683
Accumulated depreciation		(367,448)		(324,141)		(310,778)
Net book value		532,966		594,682		$ 656,905
Offshore Support Vessels, Anchor Handling Towing Supply
Historical cost	[1],[2]	948		12,112
Accumulated depreciation	[2]	(825)		(4,578)
Net book value	[2]	123		7,534
Fast Support Vessels
Historical cost	[1],[3]	344,833		340,411
Accumulated depreciation	[3]	(160,823)		(142,096)
Net book value	[3]	184,010		198,315
Platform Supply Vessels
Historical cost	[1],[4]	290,416		301,461
Accumulated depreciation	[4]	(66,478)		(53,100)
Net book value	[4]	223,938		248,361
Offshore Support Vessels, Liftboats
Historical cost	[1]	243,295		243,295
Accumulated depreciation		(118,923)		(103,459)
Net book value		124,372		139,836
General Machinery and Spares
Historical cost	[1]	9,394		9,343
Accumulated depreciation		(9,248)		(9,161)
Net book value		146		182
Property, Plant and Equipment, Other Types
Historical cost	[1],[5]	11,528		12,201
Accumulated depreciation	[5]	(11,151)		(11,747)
Net book value	[5]	$ 377		$ 454
[1] Includes property and equipment acquired in business acquisitions at acquisition date fair value and net of the impact of recognized impairment charges. Most of the Company’s vessels are pledged as collateral under the 2024 SMFH Credit Facility. Anchor handling towing supply vessels (“AHTS”). Fast support vessels (“FSVs”). Platform support vessels (“PSVs”). Includes buildings, leasehold improvements, vehicles and other property and equipment.

Nature of Operations and Acco_9

Nature of Operations and Accounting Policies - Schedule of Accumulated Other Comprehensive (Loss) Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 374,224	$ 379,146	$ 446,541
Other comprehensive income (loss)	(436)	730	(1,208)
Income tax expense	0	0	0
Balance	298,322	374,224	379,146
Accumulated Foreign Currency Adjustment Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	7,577	6,332	10,783
Other comprehensive income (loss)	(436)	1,245	(4,451)
Income tax expense	0	0	0
Balance	7,141	7,577	6,332
Accumulated (Losses) Gains, Net, Cash Flow Hedge, Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	0	515	(2,728)
Other comprehensive income (loss)	0	(515)	3,243
Income tax expense	0	0	0
Balance	0	0	515
AOCI Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	7,577	6,847	8,055
Other comprehensive income (loss)	(436)	730	(1,208)
Income tax expense	0	0	0
Balance	7,141	7,577	6,847
Accumulated Foreign Currency Adjustment Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(1,445)	(1,445)	(1,445)
Other comprehensive income (loss)	0	0	0
Income tax expense	0	0	0
Balance	(1,445)	(1,445)	(1,445)
Accumulated Loss, Net, Cash Flow Hedge, Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	(11)	(11)	(11)
Other comprehensive income (loss)	0	0	0
Income tax expense	0	0	0
Balance	(11)	(11)	(11)
AOCI Attributable to Noncontrolling Interest
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	730	(1,208)	5,265
Other comprehensive income (loss)	(436)	730	(1,208)
Income tax expense	0	0	0
Balance	$ (436)	$ 730	$ (1,208)

Equipment Acquisitions and Di_3

Equipment Acquisitions and Dispositions - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) Vessel	Dec. 31, 2023 USD ($) Vessel	Dec. 31, 2022 USD ($) Vessel
Property Plant And Equipment [Line Items]
Proceeds from disposition of property and equipment | $	$ 24,858	$ 44,730	$ 6,734
AHTS
Property Plant And Equipment [Line Items]
Number of equipment sold, classified as held for sale | Vessel	1
Number of equipment sold previously not classified as held for sale | Vessel	2
Specialty Vessel
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel		1
Fast Support Vessels
Property Plant And Equipment [Line Items]
Number of equipment sold, classified as held for sale | Vessel			1
Number of equipment sold | Vessel			1
Impairment charges | $			$ 900
FSV and Other Equipment
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel		1
Platform Supply Vessels
Property Plant And Equipment [Line Items]
Payments to acquire property, plant, and equipment, including fair value hedges | $	$ 7,300	$ 10,600	$ 500
ATHS and Other Equipment
Property Plant And Equipment [Line Items]
Gain (loss) on disposition of property, plant and equipment | $	17,200
Proceeds from disposition of property and equipment | $	$ 24,900
Lift Boats, Specialty Vessels, FSV and Other Equipment
Property Plant And Equipment [Line Items]
Gain (loss) on disposition of property, plant and equipment | $		21,100
Proceeds from disposition of property and equipment | $		$ 44,700
Lift Boats Office Space and Other Equipment
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel			1
FSV, Lift Boats, Office Space and Other Equipment
Property Plant And Equipment [Line Items]
Gain (loss) on disposition of property, plant and equipment | $			$ 2,200
Proceeds from disposition of property and equipment | $			$ 6,700
Liftboats
Property Plant And Equipment [Line Items]
Number of equipment sold, classified as held for sale | Vessel		1
Number of equipment sold | Vessel		3

Equipment Acquisitions and Di_4

Equipment Acquisitions and Dispositions - Schedule of Vessel Acquired and Disposed (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property Plant And Equipment [Line Items]
Acquired	0	1	1
Removed from service	3	6	3	[1]
Anchor Handling Towing Supply
Property Plant And Equipment [Line Items]
Removed from service	3	0	1	[1]
Fast Support Vessels
Property Plant And Equipment [Line Items]
Acquired	0	1	0
Removed from service	0	1	1	[1]
Platform Supply Vessels
Property Plant And Equipment [Line Items]
Acquired	0	0	1
Removed from service	0	0	0	[1]
Offshore Support Vessels, Liftboats
Property Plant And Equipment [Line Items]
Removed from service	0	4	1	[1]
Specialty Vessel
Property Plant And Equipment [Line Items]
Removed from service	0	1	0	[1]
[1] Excludes one specialty vessel that was previously removed from service, which was sold in 2023.

Equipment Acquisitions and Di_5

Equipment Acquisitions and Dispositions - Schedule of Vessel Acquired and Disposed (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2023 Vessel
Specialty Vessel
Property Plant And Equipment [Line Items]
Number of equipment sold	1

Investments, at Equity, and A_3

Investments, at Equity, and Advances to 50% or Less Owned Companies - Schedule of Equity Investments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule Of Investments [Line Items]
Investments at equity	$ 3,541	$ 4,125
Current assets	173,651	164,686
Current liabilities	85,042	77,086
Operating Revenues	271,361	279,511	$ 217,325
Net loss	$ (78,124)	(9,314)	(71,649)
SEACOR Marlin LLC
Schedule Of Investments [Line Items]
Ownership percentage	49%
Seabulk Angola
Schedule Of Investments [Line Items]
Ownership percentage	49%
Investments at equity	$ 962	1,668
SEACOR Marine Arabia
Schedule Of Investments [Line Items]
Ownership percentage	45%
Investments at equity	$ 2,508	2,385
Other Offshore Marine Services Joint Ventures
Schedule Of Investments [Line Items]
Investments at equity	$ 71	72
Other Offshore Marine Services Joint Ventures | Minimum
Schedule Of Investments [Line Items]
Ownership percentage	20%
Other Offshore Marine Services Joint Ventures | Maximum
Schedule Of Investments [Line Items]
Ownership percentage	50%
All Other Excluding MexMar, Falcon Global, Sea-Cat Crewzer and Sea-Cat Crewzer II
Schedule Of Investments [Line Items]
Current assets	$ 29,405	29,820
Noncurrent assets	110	61
Current liabilities	21,664	21,008
Noncurrent liabilities	12	0
Operating Revenues	78,719	68,949	133,740
Operating and administrative	69,741	61,294	90,678
Depreciation	21	27	21,434
Costs and expenses	69,762	61,321	112,112
Operating Income	8,957	7,628	21,628
Net loss	$ 7,464	$ 5,239	$ 15,057

Investments, at Equity, and A_4

Investments, at Equity, and Advances to 50% or Less Owned Companies - Additional Information (Details)			12 Months Ended
	Sep. 29, 2022 USD ($)	Sep. 13, 2018 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($) Vessel	Dec. 31, 2021 USD ($)
Schedule Of Investments [Line Items]
Consolidated retained earnings			$ 2,300,000
Proceeds from divestiture of interest in joint venture	$ 7,000,000
Proceeds from sale of investment in equity investees	66,000,000		$ 0	$ 0	$ 66,000,000
Gain on sale recognized, amount	$ 788,000
Subsidiaries of CME
Schedule Of Investments [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners			51%
Prior to the Closing of the Framework Agreement Transactions | OTM
Schedule Of Investments [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	51%
MexMar
Schedule Of Investments [Line Items]
Capital distributions from equity investees					0	$ 0
MexMar | Related Party
Schedule Of Investments [Line Items]
Vessel management fees					$ 200,000
MexMar | Prior to the Closing of the Framework Agreement Transactions
Schedule Of Investments [Line Items]
Equity method investment, ownership percentage	49%
MexMar | Offshore Support Vessels
Schedule Of Investments [Line Items]
Number of equipment operated | Vessel					19
SEACOR Marlin LLC
Schedule Of Investments [Line Items]
Capital distributions from equity investees					$ 1,100,000
Equity method investment, ownership, percent sold		51%
Proceeds from divestiture of interest in joint venture		$ 8,000,000
Gain (loss) on disposition of business		$ 400,000
Equity method investment, ownership percentage			49%
SEACOR Marine Arabia and other
Schedule Of Investments [Line Items]
Capital distributions from equity investees			$ 2,900,000	2,200,000	2,000,000
SEACOR Marine Arabia and other | Related Party
Schedule Of Investments [Line Items]
Vessel management fees			$ 0	$ 0	$ 0

Investments, at Equity, and A_5

Investments, at Equity, and Advances to 50% or Less Owned Companies - Schedule of Gain on Sale of Equity Investments (Details) - USD ($) $ in Thousands		12 Months Ended
	Sep. 29, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Schedule of Investments [Abstract]
Proceeds from sale of investment in equity investees	$ 66,000	$ 0	$ 0	$ 66,000
51% ownership in SEACOR Marlin Joint Venture	7,000
Hybrid Battery Power System	1,394
Less: Transaction Fees and other Costs	1,159
Total Net Proceeds	73,235
Less: Net Equity in MexMar and OVH Joint Ventures	65,546
Less: Net Book Value of SEACOR Davis	5,507
Less: OVH Note Receivable	1,394
Gain on Sale of MexMar, OVH and Other Assets	$ 788

Leases - Additional Information

Leases - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Lessee Lease Description [Line Items]
Operating lease, impairment loss	$ 0	$ 0.7	$ 0.7
Other Equipment | Minimum
Lessee Lease Description [Line Items]
Operating lease, lease terms (in duration)	6 months
Other Equipment | Maximum
Lessee Lease Description [Line Items]
Operating lease, lease terms (in duration)	264 months
Machinery and Equipment | Maximum
Lessee Lease Description [Line Items]
Operating lease, lease terms (in duration)	12 months

Leases - Summary of Future Mini

Leases - Summary of Future Minimum Payments For Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Operating Leases
2025	$ 806
2026	474
2027	400
2028	341
2029	341
Years subsequent to 2029	2,531
Operating lease payments due	4,893
Interest component	(1,305)
Total operating leases	3,588
Current portion of operating lease liabilities	606	$ 1,591
Long-term operating lease liabilities	2,982	3,529
Finance Leases
2025	20
2026	13
2027	9
2028	0
2029	0
Years subsequent to 2029	0
Total finance leases	42
Interest component	(5)
Finance Leases	37
Current portion of finance lease liabilities	17	35
Long-term finance lease liabilities	$ 20	$ 6

Leases - Summary of Components

Leases - Summary of Components of Leases Expense (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023
Leases [Abstract]
Operating lease cost		$ 1,216	$ 2,222
Finance lease cost:
Amortization of finance lease assets	[1]	44	468
Interest on finance lease liabilities	[2]	3	202
Short-term lease costs		462	526
Total lease expense		$ 1,725	$ 3,418
[1] Included in amortization costs in the consolidated statements of income (loss). Included in interest expense in the consolidated statements of income (loss).

Leases - Summary of Supplementa

Leases - Summary of Supplemental Cash Flow Information Related to Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Leases [Abstract]
Operating cash flows from operating leases	$ 1,841
Financing cash outflows from finance leases	41	$ 531	$ 351
Right-of-use assets obtained for operating lease liabilities	0
Right-of-use assets obtained for finance lease liabilities	$ 34

Leases - Summary of Other Infor

Leases - Summary of Other Information Related to Leases (Details)	Dec. 31, 2024
Leases [Abstract]
Weighted average remaining lease term, in years - operating leases	11 years 8 months 12 days
Weighted average remaining lease term, in years - finance leases	2 years 3 months 18 days
Weighted average discount rate - operating leases	6.20%
Weighted average discount - finance leases	10%

Long Term Debt - Schedule of Lo

Long Term Debt - Schedule of Long-term Debt Obligations (Details) - USD ($)	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 350,000,000	$ 353,024,000
Current portion due within one year	(27,500,000)	(28,365,000)
Unamortized debt discount	(4,338,000)	(32,885,000)
Deferred financing costs	(823,000)	(4,230,000)
Long-term debt, less current portion	317,339,000	287,544,000
2024 SMFH Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	350,000,000	0
Guaranteed Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	0	90,000,000
New Convertible Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	0	35,000,000
Unamortized debt discount		(3,700,000)	$ (4,900,000)
2023 SMFH Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	0	118,950,000
Sea-Cat Crewzer III Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	0	14,227,000
SEACOR Delta Shipyard Financing
Debt Instrument [Line Items]
Long-term Debt, Gross	0	68,647,000
SEACOR Alpine Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 0	$ 26,200,000

Long Term Debt - Schedule of _2

Long Term Debt - Schedule of Long-term Debt Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Debt Disclosure [Abstract]
2025	$ 27,500
2026	30,000
2027	30,000
2028	30,000
2029	232,500
Years subsequent to 2029	0
Long-term Debt, Gross	$ 350,000	$ 353,024

Long Term Debt - Additional Inf

Long Term Debt - Additional Information (Details) $ / shares in Units, € in Millions

12 Months Ended

Nov. 27, 2024 USD ($)

Sep. 08, 2023 USD ($)

Jun. 16, 2023 USD ($) Installments

Oct. 05, 2022 USD ($) $ / shares

Dec. 31, 2024 USD ($) Vessel $ / shares

Dec. 31, 2023 USD ($)

Dec. 31, 2022 USD ($)

Feb. 25, 2021

May 02, 2018 USD ($)

Dec. 31, 2017

Apr. 21, 2016 USD ($)

Apr. 21, 2016 EUR (€)

Debt Instrument [Line Items]

Loss on Debt Extinguishment

$ 31,923,000

$ 2,004,000

$ (10,429,000)

Payments on debt extinguishment costs

(3,671,000)

(1,827,000)

(2,271,000)

Unamortized debt issuance costs

3,109,000

Cash and Cash Equivalents

$ 76,140,000

84,131,000

Class of warrant or right, exercise price of warrants or rights | $ / shares

$ 0.01

$ 0.01

Letters of credit outstanding, amount

$ 400,000

Unamortized discount

$ 4,338,000

32,885,000

Amortization of debt discount and issue costs

4,000,000

Contractual interest expense

4,000,000

Total interest expense

$ 8,000,000

Senior Secured Term Loan with EnTrust Global

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

$ 391,000,000

$ 122,000,000

2024 SMFH Credit Facility

Debt Instrument [Line Items]

Bears fixed interest rate

10.30%

Percentage of maximum debt-to-capitalization ratio

65%

Commitment fee percentage

3%

Debt instrument payment terms

The loan may be prepaid at any time in amounts of $1.0 million or greater, subject to: (a) prior to the 12-month anniversary of funding, a premium equal to the remaining unpaid interest due over the first 15-months of the loan, and (b) after the 12-month anniversary of funding and prior to the 30-month anniversary of funding, a premium decreasing over time from 2.50% to 1.00%.

2024 SMFH Credit Facility | Tranche A

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

$ 350,000,000

Indebtedness

328,700,000

2024 SMFH Credit Facility | Tranche B

Debt Instrument [Line Items]

Line of credit facility, outstanding amount

41,000,000

Line of credit facility, maximum borrowing capacity

$ 41,000,000

Percentage of debt obligations outstanding

2.13%

2024 SMFH Credit Facility | Minimum

Debt Instrument [Line Items]

Percentage of decreasing premium

1%

Principal repayment of loan

$ 1,000,000

Cash and Cash Equivalents, Percentage

7.50%

Cash and Cash Equivalents

$ 20,000,000

2024 SMFH Credit Facility | Maximum

Debt Instrument [Line Items]

Percentage of decreasing premium

2.50%

2024 SMFH Credit Facility | Maximum | Tranche B

Debt Instrument [Line Items]

Commitments available

$ 20,500,000

2024 SMFH Credit Facility | March 31, 2025 | Tranche A

Debt Instrument [Line Items]

Quarterly amortization payments

$ 5,000,000

2024 SMFH Credit Facility | Prior to and including the period ending December 31, 2026

Debt Instrument [Line Items]

Percentage of minimum equity ratio

30%

2024 SMFH Credit Facility | Thereafter

Debt Instrument [Line Items]

Percentage of minimum equity ratio

35%

2024 SMFH Credit Facility | Thereafter | Tranche A

Debt Instrument [Line Items]

Quarterly amortization payments

$ 7,500,000

Senior PIK Toggle Notes due 2026

Debt Instrument [Line Items]

Convertible debt, total

$ 90,000,000

Senior PIK Toggle Notes due 2026 | Minimum

Debt Instrument [Line Items]

Debt instrument, interest rate

8%

Senior PIK Toggle Notes due 2026 | Maximum

Debt Instrument [Line Items]

Debt instrument, interest rate

9.50%

Convertible Senior Notes due 2026

Debt Instrument [Line Items]

Debt instrument, interest rate

4.25%

Convertible debt, total

$ 35,000,000

Guaranteed Notes

Debt Instrument [Line Items]

Debt instrument, maturity date

Jul. 01, 2026

Unamortized debt issuance costs

$ 760,000

Convertible debt, total

$ 90,000,000

Guaranteed Notes | Cash Interest

Debt Instrument [Line Items]

Debt instrument, interest rate

8%

Guaranteed Notes | Tranche A

Debt Instrument [Line Items]

Indebtedness

$ 90,000,000

Guaranteed Note Hybrid Interest

Debt Instrument [Line Items]

Debt instrument, interest rate

9.50%

Guaranteed Note Hybrid Interest Payment in Cash

Debt Instrument [Line Items]

Debt instrument, interest rate

4.25%

Guaranteed note hybrid interest Payment in Kind [Member]

Debt Instrument [Line Items]

Debt instrument, interest rate

5.25%

Old Convertible Notes

Debt Instrument [Line Items]

Debt instrument, maturity date

Jul. 01, 2026

Convertible debt, total

$ 35,000,000

$ 125,000,000

$ 175,000,000

Debt instrument, convertible, conversion ratio

85.1064

Debt instrument, convertible, conversion price | $ / shares

$ 11.75

Redemption, percentage of principal amount

4.25%

Debt instrument, face amount

$ 1,000

Debt instrument, conversion description

SEACOR Marine had the right to cause the mandatory conversion of the New Convertible Notes into Common Stock if the daily VWAP of the Common Stock equals or exceeds (A) in the case of New Convertible Notes held by affiliates of Carlyle, 150% of the Conversion Price and (B) in the case of New Convertible Notes held by any Person other than Carlyle, 115% of the Conversion Price, in each case for each of the 20 consecutive trading days.

New Convertible Notes

Debt Instrument [Line Items]

Debt instrument, maturity date

Jul. 01, 2026

Unamortized debt issuance costs

$ 287,000

Interest rate

9.46%

Debt instrument, convertible, conversion price | $ / shares

$ 11.75

Redemption, percentage of principal amount

4.25%

Debt instrument, face amount

$ 1,000

Debt instrument, conversion description

SEACOR Marine had the right to cause the mandatory conversion of the New Convertible Notes into Common Stock if the daily volume-weighted average price (“VWAP”) of the Common Stock equals or exceeds (A) in the case of New Convertible Notes held by affiliates of Carlyle, 150% of the Conversion Price and (B) in the case of New Convertible Notes held by any Person other than affiliates of Carlyle, 115% of the Conversion Price, in each case for each of the 20 consecutive trading days. Proceeds from the 2024 SMFH Credit Facility were used to satisfy in full the New Convertible Notes.

Unamortized discount

3,700,000

$ 4,900,000

Issuance costs

400,000

600,000

Total net carrying amount

30,900,000

29,500,000

Amortization of debt discount and issue costs

$ 1,500,000

1,400,000

300,000

Contractual interest expense

2,900,000

2,900,000

700,000

Total interest expense

4,400,000

4,300,000

$ 1,000,000

New Convertible Notes | Tranche A

Debt Instrument [Line Items]

Indebtedness

$ 35,000,000

New Convertible Notes Carlyle Group

Debt Instrument [Line Items]

Debt instrument, conversion price percentage

150%

New Convertible Notes Other Than Carlyle Group

Debt Instrument [Line Items]

Debt instrument, conversion price percentage

115%

2023 SMFH Credit Facility

Debt Instrument [Line Items]

Bears fixed interest rate

11.75%

Debt instrument, maturity date

Sep. 14, 2028

Percentage of ownership acquire previously

100%

Percentage of quarterly amortization

2.50%

Payments on debt extinguishment costs

(1,800,000)

Unamortized debt issuance costs

512,000

$ 200,000

Indebtedness

$ 104,800,000

2023 SMFH Credit Facility | Tranche A

Debt Instrument [Line Items]

Indebtedness

$ 109,800,000

SEACOR Delta Shipyard Financing | Tranche A

Debt Instrument [Line Items]

Indebtedness

60,300,000

SEACOR Alpine Credit Facility

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

$ 28,000,000

Debt instrument, maturity date

Jun. 27, 2028

Unamortized debt issuance costs

492,000

SEACOR Alpine Credit Facility | Tranche A

Debt Instrument [Line Items]

Indebtedness

$ 21,800,000

Number of installments | Installments

8

SEACOR Alpine Credit Facility | Tranche B

Debt Instrument [Line Items]

Repaid principal amount

$ 140,000

Number of installments | Installments

24

SEACOR Alpine Credit Facility | Tranche C

Debt Instrument [Line Items]

Bears fixed interest rate

10.25%

Repaid principal amount

$ 100,000

Sea-Cat Crewzer III

Debt Instrument [Line Items]

Unamortized debt issuance costs

$ 1,058,000

Interest rate

2.76%

Debt instrument, face amount | €

€ 27.6

Sea-Cat Crewzer III | Tranche A

Debt Instrument [Line Items]

Indebtedness

$ 11,800,000

SEACOSCO Acquisition Debt

Debt Instrument [Line Items]

Number of vessels owned | Vessel

8

Number of vessels delivered to the company | Vessel

7

SEACOR Offshore Delta LLC

Debt Instrument [Line Items]

Business acquisition, amortization period of purchase price

10 years

Debt instrument, description of floating interest rate basis

three-month LIBOR, later amended to Term SOFR, plus 4.0%

Debt instrument, basis spread on floating interest rate

4%

Long Term Debt - Schedule of De

Long Term Debt - Schedule of Debt Extinguishment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Unamortized Debt Discount	$ 25,143
Deferred Issuance Costs	3,109
Debt Prepayment Fees	3,554
Third Party Fees	117
Loss on Debt Extinguishment	31,923	$ 2,004	$ (10,429)
Guaranteed Notes
Debt Instrument [Line Items]
Unamortized Debt Discount	5,599
Deferred Issuance Costs	760
New Convertible Notes
Debt Instrument [Line Items]
Unamortized Debt Discount	2,340
Deferred Issuance Costs	287
2023 SMFH Credit Facility
Debt Instrument [Line Items]
Unamortized Debt Discount	1,550
Deferred Issuance Costs	512	$ 200
Debt Prepayment Fees	3,294
Sea-Cat Crewzer III Term Loan Facility
Debt Instrument [Line Items]
Deferred Issuance Costs	1,058
Debt Prepayment Fees	42
SEACOR Delta Shipyard Financing
Debt Instrument [Line Items]
Unamortized Debt Discount	15,654
SEACOR Alpine Credit Facility
Debt Instrument [Line Items]
Deferred Issuance Costs	492
Debt Prepayment Fees	$ 218

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Oct. 31, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Income tax (benefit) expense and equity in earnings		50%		50%
Effective income tax rate reconciliation, percent, total		(3.10%)	216.20%	12.30%
Suspended interest deductible		$ 1.2	$ 1.8
Interest expense suspended, limitation percentage		30%
Operating loss carryforwards, percentage of taxable income, utilization limitation		80%
Operating loss carryforwards, total		$ 78.6
Operating loss carryforwards, expiration period		20 years
Operating loss carry forwards expiration year		2037
Operating loss carryforwards, valuation allowance, total		$ 4.9	4.9
Foreign tax credit carryforwards		4.3	4.3
General Tax Authority, Qatar
Income Taxes [Line Items]
Income tax liability	$ 0.6
Income tax examination, description	In October 2024, the Company received a tax assessment from the General Tax Authority in Qatar for $0.6 million relating to tax returns for the years 2018 through 2023 for which the Company is filing an appeal.
Income tax examination, years	2018 2019 2020 2021 2022 2023
Louisiana
Income Taxes [Line Items]
Operating loss carryforwards, valuation allowance, total		$ 0.6	$ 0.6

Income Taxes - Schedule of Loss

Income Taxes - Schedule of Loss before Income Tax (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Taxes [Line Items]
Loss from Continuing Operations Before Income Tax (Benefit) Expense and Equity in Earnings of 50% or Less Owned Companies	$ (83,047)	$ (4,071)	$ (70,078)
United States
Income Taxes [Line Items]
Loss from Continuing Operations Before Income Tax (Benefit) Expense and Equity in Earnings of 50% or Less Owned Companies	(67,632)	(3,576)	(48,037)
Foreign
Income Taxes [Line Items]
Loss from Continuing Operations Before Income Tax (Benefit) Expense and Equity in Earnings of 50% or Less Owned Companies	(15,255)	(335)	(21,881)
Eliminations
Income Taxes [Line Items]
Loss from Continuing Operations Before Income Tax (Benefit) Expense and Equity in Earnings of 50% or Less Owned Companies	$ (160)	$ (160)	$ (160)

Income Taxes - Components of In

Income Taxes - Components of Income Tax (Benefit) Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Federal, current	$ 0	$ (18)	$ 90
State, current	(44)	47	(78)
Foreign, current	11,111	13,831	8,473
Current income tax expense	11,067	13,860	8,485
Federal, deferred	(13,629)	(5,062)	7
State, deferred	(53)	8	90
Foreign, deferred	0	(7)	0
Deferred income tax benefit	(13,682)	(5,061)	97
Income Tax (Benefit) Expense	$ (2,615)	$ 8,799	$ 8,582

Income Taxes - Schedule of Effe

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory rate	(21.00%)	(21.00%)	(21.00%)
Income (loss) of foreign subsidiaries not includable in U.S. return and foreign withholding tax	15.90%	223.40%	20.80%
Non-Deductible Expenses	0.10%	1.20%	0.30%
JV equity earnings	0%	0%	0%
Sale of investments in 50% or less owned companies	0%	0%	11.10%
162(m) - Executive compensation	1.80%	17.80%	0%
Return to provision	0%	0%	0%
State Taxes	(0.10%)	1.10%	0%
Subpart F Income and GILTI	1.30%	6.60%	0.70%
Share Award Plans	(1.10%)	(12.90%)	0.30%
Other	0%	0%	0.10%
Effective Tax Rate	(3.10%)	216.20%	12.30%

Income Taxes - Schedule of Ef_2

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2022
Income Tax Disclosure [Abstract]
Income tax (benefit) expense and equity in earnings	50%	50%

Income Taxes - Schedule of Defe

Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax liabilities:
Property and equipment	$ 43,732	$ 48,779
Other	684	3,533
Total deferred tax liabilities	44,416	52,312
Deferred tax assets:
Federal net operating loss carryforwards	16,501	10,887
Foreign tax credits	4,283	4,282
Deferred state taxes	1,934	1,894
Other	4,573	4,456
Total deferred tax assets	27,291	21,519
Valuation allowance	(4,912)	(4,925)
Total deferred tax assets	22,379	16,594
Net deferred tax liabilities	$ 22,037	$ 35,718

Derivative Instruments and He_3

Derivative Instruments and Hedging Strategies - Schedule of Fair Value of Derivative Assets and Liabilities (Details) - Not Designated as Hedging Instrument - Forward Exchange Contract - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Derivative [Line Items]
Derivative Asset	$ 0	$ 608
Derivative Liability	$ 464	$ 0

Derivative Instruments and He_4

Derivative Instruments and Hedging Strategies - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative gains (losses) on cash flow hedges	$ 0	$ 56	$ 1,608
Cash Flow Hedging
Derivative [Line Items]
Derivative gains (losses) on cash flow hedges		(500)	$ 2,300
Derivative Liabilities | Fair Value Hedging
Derivative [Line Items]
Recognized gain (loss) on hedged item in fair value hedge	$ (900)	$ 600

Derivative Instruments and He_5

Derivative Instruments and Hedging Strategies - Effect of Derivative Instruments on Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative gains (losses) on cash flow hedges	$ 0	$ 56	$ 1,608
Interest Rate Swap
Derivative [Line Items]
Derivative gains (losses) on cash flow hedges	0	56	1,608
Joint Venture Interest Rate Swap
Derivative [Line Items]
Derivative gains (losses) on cash flow hedges	0	0	941
Interest Expense
Derivative [Line Items]
Reclassification of derivative losses on cash flow hedges	$ 0	$ (571)	$ 694

Derivative Instruments and He_6

Derivative Instruments and Hedging Strategies - Schedule of Gains (Losses) on Derivative Instruments not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Foreign Exchange Option
Derivative [Line Items]
Gains (losses) on derivative instruments	$ (908)	$ 608	$ 0

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities Measured on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Fair Value, Inputs, Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Asset		$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Receivables, Net, Current
Derivative Liability	$ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Derivative Liability, Current
Fair Value, Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Asset		$ 608
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Receivables, Net, Current
Derivative Liability	$ 464
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Derivative Liability, Current
Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Asset		$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Receivables, Net, Current
Derivative Liability	$ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Derivative Liability, Current

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Estimated Fair Values of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Reported Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, including current portion	$ 344,839	$ 315,909
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, including current portion	0	0
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 2
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, including current portion	345,662	307,653
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, including current portion	$ 0	$ 0

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment charges	$ 3.7
Impairment of long-lived assets owned or leased in vessels	$ 3.7		$ 2.9
Anchor Handling Towing Supply
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment of long-lived assets owned or leased in vessels		$ 0.7	$ 0.7

Warrants - Additional Informati

Warrants - Additional Information (Details) - $ / shares	Nov. 13, 2024	Nov. 09, 2023	Jan. 17, 2023	Dec. 31, 2024	Oct. 05, 2022
Class Of Warrant Or Right [Line Items]
Class of warrant or right, exercised during period	24,138	17,635	117,515
Class of warrant or right, exercise price per share				$ 0.01	$ 0.01
Class of warrant or right, outstanding				1,280,195
Number of shares withheld in an exercise to purchase warrants as payment for the exercise	39	16	121
Warrants Transactions
Class Of Warrant Or Right [Line Items]
Class of warrant or right, exercise price per share				$ 0.01
Class of warrant or right, number of securities called by warrants or rights				2,560,456

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Details) - USD ($)					3 Months Ended	12 Months Ended
	Nov. 13, 2024	Nov. 09, 2023	Nov. 01, 2023	Jan. 17, 2023	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Class Of Stock [Line Items]
Class of warrant or right, exercised during period	24,138	17,635		117,515
Class of warrant or right, outstanding						1,280,195
Number of shares withheld in an exercise to purchase warrants as payment for the exercise	39	16		121
Proceeds from issuance of common stock					$ 77,623	$ 0	$ 24,000	$ 0
Exchange Warrants
Class Of Stock [Line Items]
Number of shares withheld in an exercise to purchase warrants as payment for the exercise	39	16
Prior ATM Program
Class Of Stock [Line Items]
Consideration received from sale of stock			$ 25,000,000
Proceeds from issuance of common stock					$ 23,590
Common Stock [Member] | Prior ATM Program
Class Of Stock [Line Items]
Number of shares issued					7,674
Share price					$ 13.1891		$ 13.1891

Noncontrolling Interests in S_3

Noncontrolling Interests in Subsidiaries - Schedule of Noncontrolling Interests in the Company's Consolidated Subsidiaries (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Minority Interest [Line Items]
Noncontrolling interests in subsidiaries	$ 321	$ 321
VEESEA Holdings Inc.
Minority Interest [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners	1.80%
Noncontrolling interests in subsidiaries	$ 321	$ 321

Savings and Multi-employer Pe_2

Savings and Multi-employer Pension Plans - Additional Information (Details) £ in Millions, $ in Millions					12 Months Ended
	Jul. 05, 2024 USD ($)	Jul. 05, 2024 GBP (£)	Jul. 01, 2022	Jan. 01, 2022	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021
Pension And Other Postretirement Benefits Disclosure [Line Items]
Defined contribution plan, employer matching contribution, percent of employees' gross pay			4%	3%				2%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Amount					$ 1.1	$ 1.1	$ 0.8
Other Defined Contribution Plan
Pension And Other Postretirement Benefits Disclosure [Line Items]
Defined contribution plan, cost					$ 0.3	$ 0.7	$ 0.3
MNRPF
Pension And Other Postretirement Benefits Disclosure [Line Items]
Defined contribution plan, tri annual valuation	$ 0.4	£ 0.3

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2019	Dec. 31, 2017	Jun. 07, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares)		0	0	0
Payments for distribution of restricted stock, spin-off						$ 2.7
Allocated share-based compensation expense, total		$ 6.8	$ 6.3	$ 5
Allocated share-based compensation expense, recognized tax benefit		11.2	7	3
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, total		$ 7.8	$ 6.6	$ 6.3
Exercise of options (in shares)	[1]	12,166	834	34,492
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Distribution of restricted stock in connection with spin-off						120,693
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value		$ 12.03
Performance Restricted Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period		3 years
2017 Equity Incentive Plan | Restricted Stock | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period		1 year
2017 Equity Incentive Plan | Restricted Stock | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period		3 years
2020 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares available for grant							6,005
2017 and 2020 Equity Incentive Plan | Employee Stock Option | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period		1 year
2017 and 2020 Equity Incentive Plan | Employee Stock Option | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period		3 years
Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized					300,000
Share-based compensation arrangement by share-based payment award, discount from market price, purchase date						85%
Period of common stock reserved for issuance					10 years
2022 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, number of shares authorized							2,450,000
Share-based compensation arrangement by share-based payment award, number of shares available for grant		1,005,288
2017, 2020 and 2022 Equity Incentive Plan | Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition		8 months 23 days	9 months 7 days	1 year 7 days
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value		$ 12.03	$ 9.67	$ 5.92
2017, 2020 and 2022 Equity Incentive Plan | Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Employee service share-based compensation, nonvested awards, compensation cost not yet recognized, period for recognition				2 months 1 day
[1] The intrinsic value of the options exercised was less than $ 0.1 million.

Stock Based Compensation - Sche

Stock Based Compensation - Schedule of Equity Incentive Plan Transactions (Details) - shares		12 Months Ended
		Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding as of the beginning of year (in shares)		1,026,031		1,026,865		1,061,357
Granted (in shares)		0		0		0
Exercise of options (in shares)	[1]	(12,166)		(834)		(34,492)
Forfeited (in shares)		0		0		0
Outstanding as of the end of year (in shares)		1,013,865		1,026,031		1,026,865
Director Stock Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares)		43,504		60,938		60,787
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding as of the beginning of year (in shares)	[3]	1,642,084	[2]	1,682,193	[2]	1,163,090
Granted (in shares)		637,698		660,307		1,036,605
Vested (in shares)	[4]	(887,556)		(685,416)		(514,002)
Forfeited (in shares)		0		(15,000)		(3,500)
Outstanding as of the end of year (in shares)	[2]	1,392,226		1,642,084	[3]	1,682,193	[3]
[1] The intrinsic value of the options exercised was less than $ 0.1 million. Includes 215,853 , 342,385 and 268,413 grants of performance-based restricted stock units as of December 31, 2024, 2023 and 2022, respectively, that satisfied the performance obligation and are therefore likely to vest. Excludes 326,597 , 156,620 and 216,172 grants of performance-based restricted stock units as of December 31, 2024, 2023 and 2022, respectively, that are not considered outstanding until such time that they become probable to vest. Includes 342,385 , 268,413 and 31,491 grants of performance-based restricted stock units as of December 31, 2023, 2022 and 2021, respectively, that satisfied the performance obligation and are therefore likely to vest. Excludes 156,620 , 216,172 and 354,964 grants of performance-based restricted stock units as of December 31, 2023, 2022 and 2021, respectively, that are not considered outstanding until such time that they become probable to vest. Includes 157,455 , 73,972 and 236,922 vested grants of performance-based restricted stock units as of December 31, 2024, 2023 and 2022, respectively.

Stock Based Compensation - Sc_2

Stock Based Compensation - Schedule of Equity Incentive Plan Transactions (Details) (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Intrinsic value of options exercised	$ 0.4
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Intrinsic value of options exercised	$ 0.1
Performance Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares likely to vest	215,853	342,385	268,413	31,491
Number of shares outstanding	326,597	156,620	216,172	354,964
Number of shares vested	157,455	73,972	236,922

Stock Based Compensation - Sc_3

Stock Based Compensation - Schedule of Restricted Stock Transactions (Details) - Restricted Stock - $ / shares		12 Months Ended
		Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding as of the beginning of year (in shares)	[2]	1,642,084	[1]	1,682,193	[1]	1,163,090
Non-Vested, weight average grant price (in dollars per share)		$ 7.53
Granted (in shares)		637,698		660,307		1,036,605
Granted, weight average grant price (in dollars per share)		$ 12.03
Vested (in shares)	[3]	(887,556)		(685,416)		(514,002)
Vested, weight average grant price (in dollars per share)		$ 12.28
Forfeited (in shares)		0		(15,000)		(3,500)
Forfeited, weight average grant price (in dollars per share)		$ 0
Outstanding as of the end of year (in shares)	[1]	1,392,226		1,642,084	[2]	1,682,193	[2]
Non-Vested, weight average grant price (in dollars per share)		$ 10.40		$ 7.53
[1] Includes 215,853 , 342,385 and 268,413 grants of performance-based restricted stock units as of December 31, 2024, 2023 and 2022, respectively, that satisfied the performance obligation and are therefore likely to vest. Excludes 326,597 , 156,620 and 216,172 grants of performance-based restricted stock units as of December 31, 2024, 2023 and 2022, respectively, that are not considered outstanding until such time that they become probable to vest. Includes 342,385 , 268,413 and 31,491 grants of performance-based restricted stock units as of December 31, 2023, 2022 and 2021, respectively, that satisfied the performance obligation and are therefore likely to vest. Excludes 156,620 , 216,172 and 354,964 grants of performance-based restricted stock units as of December 31, 2023, 2022 and 2021, respectively, that are not considered outstanding until such time that they become probable to vest. Includes 157,455 , 73,972 and 236,922 vested grants of performance-based restricted stock units as of December 31, 2024, 2023 and 2022, respectively.

Stock Based Compensation - Sc_4

Stock Based Compensation - Schedule of Stock Option Transactions (Details) - $ / shares		12 Months Ended
		Dec. 31, 2024		Dec. 31, 2023	Dec. 31, 2022
Share-Based Payment Arrangement [Abstract]
Outstanding, shares (in shares)		1,026,031
Granted, shares (in shares)		0		0	0
Exercise of options (in shares)	[1]	(12,166)		(834)	(34,492)
Forfeited, shares (in shares)		0
Outstanding, shares (in shares)		1,013,865	[2]	1,026,031
Exercisable, shares (in shares)	[3]	1,013,865
Non-Vested, weight average grant price (in dollars per share)		$ 12.66
Granted, weight average grant price (in dollars per share)		0
Exercised (in dollars per share)		11.48
Forfeited, weight average grant price (in dollars per share)		0
Non-Vested, weight average grant price (in dollars per share)		12.68	[2]	$ 12.66
Exercisable, weight average grant price (in dollars per share)	[3]	$ 12.68
[1] The intrinsic value of the options exercised was less than $ 0.1 million. The weighted average remaining contractual term is 3.8 years and the intrinsic value of the options exercised was $ 0.4 million. The weighted average remaining contractual term is 3.8 years and the intrinsic value of the options exercisable was $ 0.4 million.

Stock Based Compensation - Sc_5

Stock Based Compensation - Schedule of Stock Option Transactions (Details) (Parenthetical) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Share-Based Payment Arrangement [Abstract]
Share-based compensation arrangement by share-based payment award, options, exercisable, weighted average remaining contractual term	3 years 9 months 18 days
Intrinsic value of options exercised	$ 0.4
Weighted average remaining contractual term, outstanding	3 years 9 months 18 days
Intrinsic value of options exercisable	$ 0.4

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Transactions with Carlyle and Transactions with CME) (Details)							12 Months Ended
	Nov. 13, 2024 shares	Nov. 09, 2023 shares	Jan. 17, 2023 shares	Oct. 05, 2022 USD ($) $ / shares	Sep. 29, 2022 USD ($)	Dec. 16, 2016 USD ($)	Dec. 31, 2024 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($) shares	May 02, 2018 USD ($)
Related Party Transaction [Line Items]
Minimum cash requirement							$ 16,649,000	$ 16,676,000
Proceeds from sale of investment in 50% or less owned companies					$ 66,000,000		0	0	$ 66,000,000
Prepayment of outstanding loan							$ 3,671,000	$ 1,827,000	$ 2,271,000
Class of warrant or right, exercise price of warrants or rights | $ / shares				$ 0.01			$ 0.01
Class of warrant or right, outstanding | shares							1,280,195
Class of warrant or right, exercised during period | shares	24,138	17,635	117,515
Guaranteed Notes
Related Party Transaction [Line Items]
Notes redeemable denomination amount				$ 10,000,000
Convertible notes outstanding				$ 50,000,000
Debt instrument, maturity date				Jul. 01, 2026
Convertible debt, total				$ 90,000,000
Guaranteed Notes | Redeemed On or After October 1, 2023 but Prior to October 1, 2024
Related Party Transaction [Line Items]
Debt Instrument, Redemption Price, Percentage				101%
Guaranteed Notes | Redeemed On or After October 1, 2024
Related Party Transaction [Line Items]
Debt Instrument, Redemption Price, Percentage				100%
Guaranteed Note Cash Interest
Related Party Transaction [Line Items]
Debt instrument, interest rate				8%
Guaranteed Note Hybrid Interest Payment in Cash
Related Party Transaction [Line Items]
Debt instrument, interest rate				4.25%
Guaranteed Note Hybrid Interest
Related Party Transaction [Line Items]
Debt instrument, interest rate				9.50%
Guaranteed Note Hybrid Interest Payment in Kind
Related Party Transaction [Line Items]
Debt instrument, interest rate				5.25%
Old Convertible Notes
Related Party Transaction [Line Items]
Debt Instrument, Redemption Price, Percentage				4.25%
Debt instrument, percentage of new convertible notes to be purchased				100%
Debt instrument, percentage of new convertible notes to be redeemed				100%
Debt instrument, maturity date				Jul. 01, 2026
Convertible debt, total				$ 35,000,000			$ 125,000,000			$ 175,000,000
Debt instrument, conversion description							SEACOR Marine had the right to cause the mandatory conversion of the New Convertible Notes into Common Stock if the daily VWAP of the Common Stock equals or exceeds (A) in the case of New Convertible Notes held by affiliates of Carlyle, 150% of the Conversion Price and (B) in the case of New Convertible Notes held by any Person other than Carlyle, 115% of the Conversion Price, in each case for each of the 20 consecutive trading days.
Debt instrument, convertible, conversion ratio				85.1064
Debt instrument, face amount				$ 1,000
Debt instrument, convertible, conversion price | $ / shares				$ 11.75
MexMar Original Facility Agreement
Related Party Transaction [Line Items]
Debt instrument, face amount					28,800,000
MexMar Second Amended and Restated Term Loan Credit Facility Agreement
Related Party Transaction [Line Items]
Minimum cash requirement						$ 10,000,000
Debt instrument, maturity date						Jan. 23, 2025
Interest rate						4.70%
MexMar Third A&R Facility Agreement
Related Party Transaction [Line Items]
Minimum cash requirement					2,500,000
Principal repayment of loan					$ 5,000,000
Debt Instrument, Frequency of Periodic Payment							four quarterly installments
Debt instrument, maturity date					Sep. 30, 2023
Prepayment of outstanding loan					$ 8,800,000
Debt instrument, face amount					$ 20,000,000
Interest rate					5%
CME
Related Party Transaction [Line Items]
Equity method investment, ownership percentage							49%
SEACOR Marlin LLC
Related Party Transaction [Line Items]
Equity method investment, ownership percentage							49%
OVH
Related Party Transaction [Line Items]
Equity method investment, ownership percentage							49%
Other Than Carlyle | Old Convertible Notes
Related Party Transaction [Line Items]
Debt instrument, conversion price percentage				115%
New Convertible Notes and Warrants
Related Party Transaction [Line Items]
Percentage of convertible notes converted into common stock				10%
Subsidiaries of CME
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners							51%
Subsidiaries of CME | OVH
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners							51%
Subsidiary of MexMar | SEACOR Marlin LLC
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners							51%
Prior to the Closing of the Framework Agreement Transactions | Offshore Vessel Holdings
Related Party Transaction [Line Items]
Equity method investment, ownership percentage					49%
Prior to the Closing of the Framework Agreement Transactions | OTM
Related Party Transaction [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners					51%
Carlyle Group
Related Party Transaction [Line Items]
Class of warrant or right, outstanding | shares							1,280,195
Class of warrant or right, exercised during period | shares							24,138	135,150	0
Carlyle Group | Old Convertible Notes
Related Party Transaction [Line Items]
Debt instrument, conversion price percentage				150%

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) R$ in Thousands, £ in Millions, $ in Millions			12 Months Ended
	Jul. 05, 2024 USD ($)	Jul. 05, 2024 GBP (£)	Dec. 31, 2024 USD ($) Vessel	Dec. 31, 2024 BRL (R$)	Nov. 27, 2024 USD ($)
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, total			$ 90
Unrecorded unconditional purchase obligation payable during 2025			41.6
Unrecorded unconditional purchase obligation payable during 2026			$ 29.9
2024 SMFH Credit Facility
Commitments And Contingencies [Line Items]
Maximum borrowing percentage of purchase price			50%	50%
2024 SMFH Credit Facility | Tranche B
Commitments And Contingencies [Line Items]
Line of credit facility, maximum borrowing capacity					$ 41
Deficiency Notice
Commitments And Contingencies [Line Items]
Cost allocation percentage			70%
Deficiency Notice | Seabulk Overseas
Commitments And Contingencies [Line Items]
Cost allocation percentage			30%
Minimum | Deficiency Notice
Commitments And Contingencies [Line Items]
Potential range of levies			$ 4.3	R$ 26400
Maximum | Deficiency Notice
Commitments And Contingencies [Line Items]
Potential range of levies			2.1	R$ 12870
Hybrid Battery Power Systems
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, total			$ 4.4
Unrecorded unconditional purchase obligation, maximum quantity			4	4
Platform Supply Vessels
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, total			$ 82.7
Unrecorded unconditional purchase obligation, maximum quantity			2	2
Platform Supply Vessels | 2024 SMFH Credit Facility
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, maximum quantity			2	2
Payments to acquire productive assets			$ 16
Miscellaneous Vessel Equipment
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, total			$ 2.9
Anchor Handling Towing Supply | 2024 SMFH Credit Facility
Commitments And Contingencies [Line Items]
Number of equipment sold | Vessel			2
Proceeds from sale of productive assets			$ 18
MNRPF
Commitments And Contingencies [Line Items]
Defined contribution plan, tri annual valuation	$ 0.4	£ 0.3

Major Customers and Segment I_3

Major Customers and Segment Information - Additional Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2024 USD ($) Customer	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment Reporting Information [Line Items]
Revenues	$ 271,361	$ 279,511	$ 217,325
Income (loss) from equity method investments	$ 2,308	3,556	7,011
SEACOR Marine Arabia
Segment Reporting Information [Line Items]
Ownership percentage	45%
Customer Concentration Risk | Sales Revenue, Net | Seacor Marine Arabia
Segment Reporting Information [Line Items]
Revenues	$ 51,000	$ 43,200	$ 30,100
Concentration risk, percentage	19%	15%	14%
Customer Concentration Risk | Sales Revenue, Net | Ten Largest Customers
Segment Reporting Information [Line Items]
Concentration risk, percentage	76%	73%	66%
Geographic Concentration Risk | Sales Revenue, Net
Segment Reporting Information [Line Items]
Number of customer | Customer	10
Geographic Concentration Risk | Sales Revenue, Net | Non-US
Segment Reporting Information [Line Items]
Income (loss) from equity method investments	$ 2,300	$ 3,600	$ 7,000
Geographic Concentration Risk | Sales Revenue, Net | Azule Energy Angola S p A
Segment Reporting Information [Line Items]
Revenues	$ 57,600		$ 42,400
Concentration risk, percentage	21%		15%
Geographic Concentration Risk | Sales Revenue, Net | ExxonMobil
Segment Reporting Information [Line Items]
Revenues	$ 47,700		$ 39,600
Concentration risk, percentage	17%		18%
Geographic Concentration Risk | Stockholders' Equity | Non-US
Segment Reporting Information [Line Items]
Concentration risk, percentage	87%	79%	72%

Major Customers and Segment I_4

Major Customers and Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024		Dec. 31, 2023		Dec. 31, 2022
Segment Reporting Information [Line Items]
Operating Revenues	$ 271,361,000		$ 279,511,000		$ 217,325,000
Direct Costs and Expenses	197,252,000		159,650,000		171,985,000
Direct Vessel (Loss) Profit	74,109,000		119,861,000		45,340,000
Lease expense	1,678,000		2,748,000		3,869,000
Administrative and general	44,713,000		49,183,000		40,911,000
Depreciation and amortization	51,628,000		53,821,000		55,957,000
Other Costs and Expenses	98,019,000		105,752,000		100,737,000
Gains on asset dispositions and impairments, net	13,481,000		21,409,000		1,398,000
Operating Income (Loss)	(10,429,000)		35,518,000		(53,999,000)
Historical cost	900,414,000	[1]	918,823,000	[1]	967,683,000
Accumulated depreciation	(367,448,000)		(324,141,000)		(310,778,000)
Property and equipment	532,966,000		594,682,000		656,905,000
Total Assets	653,510,000	[2]	709,023,000	[3]	751,599,000	[4]
Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	254,320,000		251,385,000		203,534,000
Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	1,464,000		1,460,000		1,374,000
Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	15,577,000		26,666,000		12,417,000
Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	85,541,000		81,770,000		77,782,000
Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	40,385,000		26,826,000		31,496,000
Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	21,451,000		6,598,000		18,160,000
Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	9,894,000		9,956,000		9,962,000
Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	19,947,000		17,187,000		19,289,000
Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	20,034,000		17,313,000		15,296,000
UNITED STATES
Segment Reporting Information [Line Items]
Operating Revenues	35,799,000		59,528,000		60,800,000
Direct Costs and Expenses	46,533,000		42,446,000		50,639,000
Direct Vessel (Loss) Profit	(10,734,000)		17,082,000		10,161,000
Lease expense	555,000		536,000		998,000
Depreciation and amortization	12,334,000		14,685,000		17,444,000
Historical cost	195,756,000		209,262,000		232,740,000
Accumulated depreciation	(104,771,000)		(99,137,000)		(101,503,000)
Property and equipment	90,985,000		110,125,000		131,237,000
Total Assets	120,347,000	[2]	142,264,000	[3]	174,081,000	[4]
UNITED STATES | Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	31,991,000		41,850,000		51,272,000
UNITED STATES | Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	0		0		0
UNITED STATES | Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	3,808,000		17,678,000		9,528,000
UNITED STATES | Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	24,459,000		26,110,000		25,201,000
UNITED STATES | Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	6,618,000		5,146,000		7,049,000
UNITED STATES | Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	8,604,000		2,314,000		8,978,000
UNITED STATES | Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,992,000		3,752,000		4,831,000
UNITED STATES | Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	3,351,000		3,697,000		3,345,000
UNITED STATES | Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	509,000		1,427,000		1,235,000
Africa and Europe
Segment Reporting Information [Line Items]
Operating Revenues	104,682,000		90,311,000		59,897,000
Direct Costs and Expenses	62,447,000		51,633,000		44,379,000
Direct Vessel (Loss) Profit	42,235,000		38,678,000		15,518,000
Lease expense	507,000		1,498,000		1,691,000
Depreciation and amortization	17,497,000		15,346,000		13,708,000
Historical cost	325,000,000		272,272,000		285,303,000
Accumulated depreciation	(121,320,000)		(93,045,000)		(92,030,000)
Property and equipment	203,680,000		179,227,000		193,273,000
Total Assets	241,278,000	[2]	215,158,000	[3]	211,371,000	[4]
Africa and Europe | Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	99,410,000		87,729,000		60,060,000
Africa and Europe | Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	0		0		0
Africa and Europe | Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	5,272,000		2,582,000		(163,000)
Africa and Europe | Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	21,887,000		20,434,000		16,436,000
Africa and Europe | Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	13,537,000		9,624,000		9,229,000
Africa and Europe | Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	4,774,000		2,946,000		2,339,000
Africa and Europe | Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,329,000		1,727,000		1,178,000
Africa and Europe | Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	7,197,000		6,830,000		8,022,000
Africa and Europe | Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	12,723,000		10,072,000		7,175,000
Middle East and Asia
Segment Reporting Information [Line Items]
Operating Revenues	72,325,000		70,752,000		52,842,000
Direct Costs and Expenses	51,731,000		38,947,000		49,616,000
Direct Vessel (Loss) Profit	20,594,000		31,805,000		3,226,000
Lease expense	301,000		360,000		156,000
Depreciation and amortization	13,276,000		14,760,000		16,331,000
Historical cost	240,075,000		267,079,000		286,745,000
Accumulated depreciation	(97,908,000)		(94,708,000)		(89,444,000)
Property and equipment	142,167,000		172,371,000		197,301,000
Total Assets	174,410,000	[2]	199,174,000	[3]	215,497,000	[4]
Middle East and Asia | Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	70,346,000		66,407,000		52,080,000
Middle East and Asia | Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	0		0		0
Middle East and Asia | Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	1,979,000		4,345,000		762,000
Middle East and Asia | Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	24,132,000		20,786,000		22,376,000
Middle East and Asia | Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	13,047,000		7,109,000		8,111,000
Middle East and Asia | Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,796,000		(99,000)		6,569,000
Middle East and Asia | Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	3,147,000		3,638,000		2,838,000
Middle East and Asia | Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	4,184,000		3,552,000		5,089,000
Middle East and Asia | Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	4,425,000		3,961,000		4,633,000
Latin America
Segment Reporting Information [Line Items]
Operating Revenues	58,555,000		58,920,000		43,786,000
Direct Costs and Expenses	36,541,000		26,624,000		27,351,000
Direct Vessel (Loss) Profit	22,014,000		32,296,000		16,435,000
Lease expense	315,000		354,000		1,024,000
Depreciation and amortization	8,521,000		9,030,000		8,474,000
Historical cost	139,583,000		170,210,000		162,895,000
Accumulated depreciation	(43,449,000)		(37,251,000)		(27,801,000)
Property and equipment	96,134,000		132,959,000		135,094,000
Total Assets	117,475,000	[2]	152,427,000	[3]	150,650,000	[4]
Latin America | Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	52,573,000		55,399,000		40,122,000
Latin America | Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	1,464,000		1,460,000		1,374,000
Latin America | Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	4,518,000		2,061,000		2,290,000
Latin America | Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	15,063,000		14,440,000		13,769,000
Latin America | Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	7,183,000		4,947,000		7,107,000
Latin America | Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	5,277,000		1,437,000		274,000
Latin America | Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,426,000		839,000		1,115,000
Latin America | Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	5,215,000		3,108,000		2,833,000
Latin America | Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	$ 2,377,000		$ 1,853,000		$ 2,253,000
[1] Includes property and equipment acquired in business acquisitions at acquisition date fair value and net of the impact of recognized impairment charges. Most of the Company’s vessels are pledged as collateral under the 2024 SMFH Credit Facility. Total Assets exclude $ 73.6 million of corporate assets. Total Assets exclude $ 71.3 million of corporate assets. Total Assets exclude $ 64.0 million of corporate assets.

Major Customers and Segment I_5

Major Customers and Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Segment Reporting Information [Line Items]
Assets, Total	$ 727,111	$ 780,336
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Assets, Total	$ 73,600	$ 71,300	$ 64,000