SEACOR Marine (SMHI) 10-Q 1 Nov 23 2023 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2023	Oct. 27, 2023
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2023
Document Fiscal Year Focus	2023
Document Fiscal Period Focus	Q3
Trading Symbol	SMHI
Entity Registrant Name	SEACOR Marine Holdings Inc.
Entity Central Index Key	0001690334
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		27,159,485
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity File Number	1-37966
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
Entity Incorporation, State or Country Code	DE
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common stock
Security Exchange Name	NYSE
Document Quarterly Report	true
Document Transition Report	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Current Assets:
Cash and cash equivalents	$ 55,840	$ 39,963
Restricted cash	2,796	3,082
Receivables:
Trade, net of allowance for credit loss accounts of $4,436 and $1,650 as of September 30, 2023 and December 31, 2022, respectively	63,246	54,388
Other	8,924	7,638
Note receivable	0	15,000
Tax receivable	445	578
Inventories	1,738	2,123
Prepaid expenses and other	2,957	3,054
Assets held for sale	6,093	6,750
Total current assets	142,039	132,576
Property and Equipment:
Historical cost	936,520	967,683
Accumulated depreciation	(318,549)	(310,778)
Property and equipment	617,971	656,905
Construction in progress	9,413	8,111
Net property and equipment	627,384	665,016
Right-of-use asset - operating leases	4,907	6,206
Right-of-use asset - finance leases	45	6,813
Investments, at equity, and advances to 50% or less owned companies	3,857	3,024
Other assets	2,095	1,995
Total assets	780,327	815,630
Current Liabilities:
Current portion of operating lease liabilities	1,856	2,358
Current portion of finance lease liabilities	35	468
Current portion of long-term debt:
Recourse	28,005	61,512
Accounts payable and accrued expenses	32,466	37,954
Accrued wages and benefits	4,395	4,361
Accrued interest	3,947	2,305
Deferred revenue and unearned revenue	1,465	2,333
Accrued capital, repair, and maintenance expenditures	3,207	2,748
Accrued insurance deductibles and premiums	2,406	2,428
Accrued professional fees	988	1,114
Total current liabilities	83,966	121,425
Long-term operating lease liabilities	3,571	4,739
Long-term finance lease liabilities	15	6,781
Long-term Debt:
Recourse	291,843	254,653
Non-recourse	0	5,466
Deferred income taxes	33,078	40,779
Deferred gains and other liabilities	2,217	2,641
Total liabilities	414,690	436,484
SEACOR Marine Holdings Inc. stockholders’ equity:
Common stock, $.01 par value, 60,000,000 shares authorized; 27,640,483 and 26,950,799 shares issued as of September 30, 2023 and December 31, 2022, respectively	280	272
Additional paid-in capital	471,158	466,669
Accumulated deficit	(108,154)	(93,111)
Shares held in treasury of 480,998 and 248,638 as of September 30, 2023 and December 31, 2022, respectively, at cost	(4,221)	(1,852)
Accumulated other comprehensive income, net of tax	6,253	6,847
Total stockholders equity	365,316	378,825
Noncontrolling interests in subsidiaries	321	321
Total equity	365,637	379,146
Total liabilities and equity	780,327	815,630
SEACOR Holdings
Current portion of long-term debt:
Other current liabilities	264	264
Non-related Party
Current portion of long-term debt:
Other current liabilities	$ 4,932	$ 3,580

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Statement of Financial Position [Abstract]
Trade receivables, allowance for credit loss	$ 4,436	$ 1,650
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)	27,640,483	26,950,799
Shares held in treasury (in shares)	480,998	248,638

Unaudited Condensed Consolidate

Unaudited Condensed Consolidated Statements of Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Statement [Abstract]
Operating Revenues	$ 75,574	$ 59,791	$ 202,438	$ 159,399
Costs and Expenses:
Operating	38,816	44,006	112,391	127,647
Administrative and general	12,300	9,978	37,636	30,112
Lease expense	651	1,168	2,069	3,236
Depreciation and amortization	13,462	13,754	40,799	42,333
Costs and expenses	65,229	68,906	192,895	203,328
(Losses) Gains on Asset Dispositions and Impairments, Net	(512)	(1,783)	3,352	381
Operating Income (Loss)	9,833	(10,898)	12,895	(43,548)
Other Income (Expense):
Interest income	340	(123)	1,222	96
Interest expense	(9,536)	(7,634)	(27,060)	(21,250)
Loss on debt extinguishment	(2,004)	0	(2,004)	0
Derivative gains, net	0	1	0	0
Foreign currency gains (losses), net	571	2,314	(857)	4,305
Other, net	0	659	0	618
Nonoperating income expense	(10,629)	(4,783)	(28,699)	(16,231)
Loss Before Income Tax Expense and Equity in Earnings (Losses) of 50% or Less Owned Companies	(796)	(15,681)	(15,804)	(59,779)
Income Tax Expense	2,360	8,418	2,421	4,363
Loss Before Equity in Earnings (Losses) of 50% or Less Owned Companies	(3,156)	(24,099)	(18,225)	(64,142)
Equity in Earnings (Losses) of 50% or Less Owned Companies	2,273	(254)	3,182	5,835
Net Loss	(883)	(24,353)	(15,043)	(58,307)
Net (Loss) Income attributable to Noncontrolling Interests in Subsidiaries	0	(2)	0	1
Net Loss attributable to SEACOR Marine Holdings Inc.	$ (883)	$ (24,351)	$ (15,043)	$ (58,308)
Net Earnings (Loss) Per Share:
Basic	$ (0.03)	$ (0.91)	$ (0.56)	$ (2.19)
Diluted	$ (0.03)	$ (0.91)	$ (0.56)	$ (2.19)
Weighted Average Common Stock and Warrants Outstanding:
Basic	27,181,754	26,727,864	27,048,656	26,591,911
Diluted	27,181,754	26,727,864	27,048,656	26,591,911

Unaudited Condensed Consolida_2

Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Net Loss	$ (883)	$ (24,353)	$ (15,043)	$ (58,307)
Other Comprehensive Loss:
Foreign currency translation losses	(1,679)	(2,154)	(79)	(6,717)
Derivative gains on cash flow hedges	3	365	56	1,521
Other comprehensive income	(1,875)	(1,411)	(594)	(3,506)
Income Tax Expense	0	0	0	0
Other comprehensive income, net	(1,875)	(1,411)	(594)	(3,506)
Comprehensive Loss	(2,758)	(25,764)	(15,637)	(61,813)
Comprehensive (Loss) Income Attributable to Noncontrolling Interests in Subsidiaries	0	(2)	0	1
Comprehensive Loss Attributable to SEACOR Marine Holdings Inc.	(2,758)	(25,762)	(15,637)	(61,814)
Interest Expense
Other Comprehensive Loss:
Reclassification of derivative gains (losses) on cash flow hedges	(199)	112	(571)	749
Equity Method Investments
Other Comprehensive Loss:
Reclassification of derivative gains (losses) on cash flow hedges	$ 0	$ 266	$ 0	$ 941

Unaudited Condensed Consolida_3

Unaudited Condensed Consolidated Statements of Comprehensive Income (Loss) (Parenthetical)	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Reclassification of derivative gains on cash flow hedges to equity in earnings	50%	50%	50%	50%

Unaudited Condensed Consolida_4

Unaudited Condensed Consolidated Statements of Changes In Equity - USD ($) $ in Thousands	Total	Director [Member]	Common Stock [Member]	Common Stock [Member] Director [Member]	Additional Paid-In Capital [Member]	Treasury Stock [Member]	Treasury Stock [Member] Director [Member]	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
Amortization of share awards	3,367				3,367
Exercise of options	151				151
Exercise of options (in shares)			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
Forfeiture of employee share awards (in shares)			(3,500)
Net Loss	(58,307)							(58,308)		1
Other comprehensive loss	(2,060)							1,446	(3,506)
Balance at Sep. 30, 2022	388,970		$ 272		465,449	$ (1,852)		(79,769)	4,549	321
Balance (in shares) at Sep. 30, 2022			26,702,161			248,638
Balance at Jun. 30, 2022	413,507		$ 272		464,222	$ (1,852)		(55,418)	5,960	323
Balance (in shares) at Jun. 30, 2022			26,705,661			248,638
Amortization of share awards	1,227				1,227
Forfeiture of employee share awards (in shares)			(3,500)
Net Loss	(24,353)							(24,351)		(2)
Other comprehensive loss	(1,411)								(1,411)
Balance at Sep. 30, 2022	388,970		$ 272		465,449	$ (1,852)		(79,769)	4,549	321
Balance (in shares) at Sep. 30, 2022			26,702,161			248,638
Balance at Dec. 31, 2022	$ 379,146		$ 272		466,669	$ (1,852)		(93,111)	6,847	321
Balance (in shares) at Dec. 31, 2022	26,950,799		26,702,161			248,638
Restricted stock grants	$ 6		$ 6
Restricted stock grants (in shares)			525,397
Amortization of share awards	4,483				4,483
Exercise of options	$ 6				6
Exercise of options (in shares)	834		834
Exercise of warrants			$ 1			$ (1)
Exercise of warrants (in shares)			117,394			121
Restricted stock vesting	$ (2,368)					$ (2,368)
Restricted stock vesting (in shares)	(232,239)		(232,239)			232,239
Director share awards	$ 1		$ 1
Director share awards (in shares)			60,938
Forfeiture of employee share awards (in shares)			(15,000)
Net Loss	(15,043)							(15,043)
Other comprehensive loss	(594)								(594)
Balance at Sep. 30, 2023	$ 365,637		$ 280		471,158	$ (4,221)		(108,154)	6,253	321
Balance (in shares) at Sep. 30, 2023	27,640,483		27,159,485			480,998
Balance at Jun. 30, 2023	$ 366,855		$ 280		469,618	$ (4,221)		(107,271)	8,128	321
Balance (in shares) at Jun. 30, 2023			27,159,485			480,998
Amortization of share awards	1,540				1,540
Net Loss	(883)							(883)
Other comprehensive loss	(1,875)								(1,875)
Balance at Sep. 30, 2023	$ 365,637		$ 280		$ 471,158	$ (4,221)		$ (108,154)	$ 6,253	$ 321
Balance (in shares) at Sep. 30, 2023	27,640,483		27,159,485			480,998

Unaudited Condensed Consolida_5

Unaudited Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Cash Flows from Operating Activities:
Net Loss	$ (15,043)	$ (58,307)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	40,799	42,333
Deferred financing costs amortization	1,300	1,005
Stock-based compensation expense	4,490	3,377
Debt discount amortization	4,899	5,244
Allowance for credit losses	3,253	477
Gain from equipment sales, retirements or impairments	(3,352)	(381)
Loss on debt extinguishment	177	0
Interest on finance leases	201	171
Settlement on derivative transactions, net	577	(782)
Currency losses (gains)	857	(4,305)
Deferred income taxes	(7,701)	(860)
Equity earnings	(3,182)	(5,835)
Dividends received from equity investees	2,075	2,983
Changes in Operating Assets and Liabilities:
Accounts receivables	(13,743)	(2,955)
Other assets	1,555	(737)
Accounts payable and accrued liabilities	(6,732)	6,732
Net cash provided by (used in) operating activities	10,430	(11,840)
Cash Flows from Investing Activities:
Purchases of property and equipment	(6,960)	(277)
Proceeds from disposition of property and equipment	8,038	6,681
Principal payments on notes due from equity investees	0	528
Proceeds from sale of investment in equity investees	0	66,000
Notes due from others	0	(28,831)
Principal payments on notes due from others	15,000	8,831
Net cash provided by investing activities	16,078	52,932
Cash Flows from Financing Activities:
Payments on long-term debt	(22,992)	(30,682)
Payments on debt extinguishment	(131,604)	0
Payments on debt extinguishment cost	(1,827)	0
Proceeds from issuance of long-term debt, net of issuance costs	148,388	0
Payments on finance leases	(522)	(237)
Proceeds from exercise of stock options	6	151
Tax withholdings on restricted stock vesting and director share awards	(2,368)	(732)
Net cash used in financing activities	(10,919)	(31,500)
Effects of Exchange Rate Changes on Cash and Cash Equivalents	2	(2)
Net Change in Cash, Restricted Cash and Cash Equivalents	15,591	9,590
Cash, Restricted Cash and Cash Equivalents, Beginning of Period	43,045	41,220
Cash, Restricted Cash and Cash Equivalents, End of Period	58,636	50,810
Supplemental disclosures:
Cash paid for interest, excluding capitalized interest	21,045	14,286
Income taxes paid (refunded), net	1,730	(886)
Noncash Investing and Financing Activities:
Increase in capital expenditures in accounts payable and accrued liabilities	826	0
Exchange of property and equipment	0	(8,918)
Recognition of a new right-of-use asset - operating leases	348	163
Recognition of a new right-of-use asset - financing leases	$ 0	$ 7,248

Basis of Presentation and Accou

Basis of Presentation and Accounting Policies	9 Months Ended
	Sep. 30, 2023
Basis Of Presentation And Accounting Policies [Abstract]
Basis of Presentation and Accounting Policies	1. BASIS OF PRESENTATION AND ACCOUNTING POLICIES The condensed consolidated financial statements include the accounts of SEACOR Marine Holdings Inc. and its consolidated subsidiaries (the “Company”). In the opinion of management, all adjustments (consisting of normal recurring adjustments) have been made to fairly present the unaudited condensed consolidated financial statements for the periods indicated. Results of operations for the interim periods presented are not necessarily indicative of operating results for the full year or any future periods. Certain information and footnote disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) have been condensed or omitted. These condensed consolidated financial statements should be read in conjunction with the Company’s financial statements and related notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2022 (the “2022 Annual Report”). Unless the context otherwise indicates, any reference in this Quarterly Report on Form 10-Q to the “Company” refers to SEACOR Marine Holdings Inc. and its consolidated subsidiaries, and any reference in this Quarterly Report on Form 10-Q to “SEACOR Marine” refers to SEACOR Marine Holdings Inc. without its consolidated subsidiaries. Recently Adopted Accounting Standards. On October 29, 2020, the FASB issued ASU 2020-10, Codification Improvements: Amendments that improve the consistency of the Codification by including all disclosure guidance in the appropriate disclosure section. The guidance was effective for annual periods beginning after December 15, 2020, and interim periods within the annual periods beginning after December 15, 2022. The adoption of the standard did not have a material effect on the disclosures included herein. Critical Accounting Policies. 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. Such estimates include those related to deferred revenues, allowance for credit loss accounts, useful lives of property and equipment, impairments, income tax provisions and certain accrued liabilities. Actual results could differ from estimates and those differences may be material. Revenue Recognition . Revenue is recognized when (or as) the Company transfers promised goods or services to its customers in amounts that reflect the consideration to which the Company expects to be entitled to in exchange for those goods or services, which occurs when (or as) the Company satisfies its contractual obligations and transfers over control of the promised goods or services to its customers. The Company recognizes revenue, net of sales taxes, based on its estimates of the consideration the Company expects to receive. Costs to obtain or fulfill a contract are expensed as incurred. 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 Mexico, 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, contract 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 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. 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 deferred revenue and unearned revenue in the accompanying consolidated balance sheets, as of September 30, 2023 and December 31, 2022 were as follows (in thousands): 2023 2022 Balance at beginning of period $ 2,333 $ 1,606 Revenues deferred during the period 6,075 4,288 Revenues recognized during the period ( 6,943 ) ( 3,561 ) Balance at end of period $ 1,465 $ 2,333 As of September 30, 2023 , the Company had $ 1.5 million of unearned revenue primarily related to mobilization of vessels. Cash and 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. Restricted Cash. Restricted cash primarily relates to banking facility requirements. Trade and Other Receivables. 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, but excludes our short-term note receivable. The Company routinely reviews its receivables and makes provisions for the 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. Trade receivables are deemed uncollectible and are removed from accounts receivable and the allowance for credit losses when collection efforts have been exhausted. 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 remaining useful life, typically the next survey or certification date. As of September 30, 2023 , the estimated useful life of the Company’s new offshore support vessels was 20 years. 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 during the nine months ended September 30, 2023 and 2022 . Assets Held for Sale. As of September 30, 2023, a liftboat previously included in the United States, primarily Gulf of Mexico segment, with a carrying value of $ 5.6 million and a AHTS previously included in the Africa and Europe segment, with a carrying value of $ 0.5 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. For the nine months ended September 30, 2023 , the Company recorded impairment charges of $ 0.3 million for one leased-in anchor handling towing supply vessel (“AHTS”) to adjust for indicative future cash flows. There were no impairment s of other owned or leased-in vessels. For the nine months ended September 30, 2022 , the Company recorded impairment charges of $ 3.4 million. The Company recorded impairment charges of $ 0.9 million for one fast support vessel (“FSV”) classified as held for sale during the first quarter of 2022 and sold during the second quarter of 2022. In addition, in the third quarter of 2022, the Company recorded impairment charges of $ 1.2 million for one leased-in AHTS as it was not expected to return to active service during its remaining lease term. Additionally, the Company recorded impairment charges of $ 1.3 million for other equipment, classified as assets held for sale during the third quarter of 2022, which was subsequently sold in the first quarter of 2023. The impairment charges for the assets held for sale are included in (losses) gains on asset dispositions and impairments in the accompanying consolidated statements of income (loss). Estimated fair values for the Company owned vessels were established by independent appraisers based on researched market information, replacement cost information and other data. For vessel classes and individual vessels with indicators of impairment as of September 30, 2023, 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. During the nine months ended September 30, 2023 and 2022 , the Company did no t recognize any impairment charges related to its 50% or less owned companies. Income Taxes. During the nine months ended September 30, 2023 , the Company’s effective income tax rate of 15.32 % was primarily due to foreign taxes paid that are not creditable against U.S. income taxes. Accumulated Other Comprehensive Income (Loss). The components of accumulated other comprehensive income were as follows (in thousands): SEACOR Marine Holdings Inc. Foreign Derivative Total Other December 31, 2022 $ 6,332 $ 515 $ 6,847 Other comprehensive loss ( 79 ) ( 515 ) ( 594 ) Balance as of September 30, 2023 $ 6,253 $ — $ 6,253 Earnings ( Loss) Per Share. Basic earnings/loss per share of Common Stock of the Company 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 Old Convertible Notes and the New Convertible Notes unless anti-dilutive. For the three and nine months ended September 30, 2023 , diluted loss per share of Common Stock excluded 2,978,724 shares of Common Stock issuable upon conversion of the New Convertible Notes as the effect of their inclusion in the computation would be anti-dilutive. For the three and nine months ended September 30, 2022 , diluted loss per share of Common Stock excluded 2,907,500 shares of Common Stock issuable upon conversion of the Old Convertible Notes as the effect of their inclusion in the computation would be anti-dilutive. In addition, for the three and nine months ended September 30, 2023 and 2022 diluted loss per share of Common Stock excluded 1,642,084 and 1,645,207 shares of restricted stock, respectively, and 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.

Note Receivable

Note Receivable	9 Months Ended
	Sep. 30, 2023
Receivables [Abstract]
Note Receivable	2. NOTE RECEIVABLE In connection with the closing of the framework agreement transactions (the “Framework Agreement Transactions”), on September 29, 2022, SEACOR Marine Capital Inc., a wholly-owned subsidiary of SEACOR Marine (“SEACOR Marine Capital”) purchased all of the outstanding loans under the MexMar Original Facility Agreement for an aggregate amount of $ 28.8 million, representing par value of the loan using proceeds received from the Framework Agreement Transactions. On the same date, the MexMar Original Facility Agreement was amended and restated in the MexMar Third A&R Facility Agreement pursuant to which, among other things, Mantenimiento Express Marítimo, S.A.P.I. de C.V. (“MexMar”) repaid approximately $ 8.8 million of the outstanding loan amount and agreed to repay the $ 20.0 million of the loan that remained outstanding by September 30, 2023 through four quarterly installments of $ 5.0 million. As of September 30, 2023 , the loan balance due from MexMar was repaid in full.

Equipment Acquisitions and Disp

Equipment Acquisitions and Dispositions	9 Months Ended
	Sep. 30, 2023
Property, Plant and Equipment [Abstract]
Equipment Acquisitions and Dispositions	3. EQUIPMENT ACQUISITIONS AND DISPOSITIONS During the nine months ended September 30, 2023, capital expenditures were $ 7.0 million. Equipment deliveries during the nine months ended September 30, 2023 include one FSV. During the nine months ended September 30, 2023 , the Company sold three liftboats, one specialty vessel, previously removed from service, and other equipment, previously classified as held for sale, as well as other equipment not previously classified as such, for net cash proceeds of $ 8.0 million, after transaction costs, and a gain of $ 2.7 million. During the nine months ended September 30, 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 the FSV classified as held for sale during the first quarter of 2022 and sold during the second quarter of 2022.

Investments, at Equity, and Adv

Investments, at Equity, and Advances to 50% or Less Owned Companies	9 Months Ended
	Sep. 30, 2023
Schedule of Investments [Abstract]
Investments, at Equity, and Advances to 50% or Less Owned Companies	4. INVESTMENTS, AT EQUITY AND ADVANCES TO 50% OR LESS OWNED COMPANIES Investments, at equity, and advances to 50% or less owned companies as of September 30, 2023 and December 31, 2022 were as follows (in thousands): Ownership 2023 2022 Seabulk Angola 49.0 % 1,986 1,683 SEACOR Arabia 45.0 % 1,803 1,265 Other 20.0 % - 50.0 % 68 76 $ 3,857 $ 3,024

Long Term Debt

Long Term Debt	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Long Term Debt	5. LONG-TERM DEBT The Company’s long-term debt obligations as of September 30, 2023 and December 31, 2022 were as follows (in thousands): September 30, 2023 December 31, 2022 Recourse long-term debt (1) : Guaranteed Notes $ 90,000 $ 90,000 New Convertible Notes 35,000 35,000 2023 SEACOR Marine Foreign Holdings Credit Facility (2) 122,000 — 2018 SEACOR Marine Foreign Holdings Credit Facility (2) — 67,910 Sea-Cat Crewzer III Term Loan Facility 14,227 16,703 SEACOR Offshore Delta (f/k/a SEACOSCO) Acquisition Debt (2) — 16,205 SEACOR Delta (f/k/a SEACOSCO) Shipyard Financing 70,869 77,537 SEACOR Alpine Credit Facility (3) 27,100 — SEACOR Alpine Shipyard Financing (3) — 27,790 SEACOR 88/888 Term Loan (2) — 5,500 Tarahumara Shipyard Financing (2) — 5,597 SEACOR Offshore OSV (2) — 16,052 Total recourse long-term debt 359,196 358,294 Non-recourse long-term debt (3) : SEACOR 88/888 Term Loan (2) — 5,500 Total non-recourse long-term debt — 5,500 Total principal due for long-term debt 359,196 363,794 Current portion due within one year ( 28,005 ) ( 61,512 ) Unamortized debt discount ( 34,747 ) ( 37,511 ) Deferred financing costs ( 4,601 ) ( 4,652 ) Long-term debt, less current portion $ 291,843 $ 260,119 (1) Recourse debt represents debt issued by SEACOR Marine and/or its subsidiaries and guaranteed by SEACOR Marine or one of its operating subsidiaries as provided in the relevant debt agreements. (2) Proceeds from the 2023 SEACOR Marine Foreign Holdings Credit Facility, dated September 8, 2023, were used to satisfy in full the 2018 SEACOR Marine Foreign Holdings Credit Facility, the SEACOR Offshore Delta (f/k/a SEACOSCO) Acquisition Debt, the SEACOR 88/888 Term Loan, the Tarahumara Shipyard Financing and the SEACOR Offshore OSV debt. See details below. (3) Proceeds from the SEACOR Alpine Credit Facility, dated June 16, 2023, were used to satisfy in full the SEACOR Alpine Shipyard Financing. See details below. (4) Non-recourse debt represents debt issued by one of the Company’s consolidated subsidiaries with no recourse to SEACOR Marine or its other non-debtor operating subsidiaries with respect to the applicable instrument, other than certain limited support obligations as provided in the respective debt agreements, which in aggregate are not considered to be material to the Company’s business and financial condition. As of September 30, 2023, the Company was in compliance with all debt covenants and lender requirements. 2023 SEACOR Marine Foreign Holdings Credit Facility. On September 8, 2023, 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 $ 122.0 million senior secured term loan (the “2023 SEACOR Marine Foreign Holdings Credit Facility” and such agreement, the “2023 SMFH Credit Agreement”) with certain affiliates of EnTrust Global, as lenders, Kroll Agency Services, Limited, as facility agent, and Kroll Trustee Services Limited, as security trustee. The proceeds of the 2023 SEACOR Marine Foreign Holdings Credit Facility were used to: (x) refinance approximately $ 104.8 million of existing principal indebtedness comprised of: (a) $ 61.1 million incurred under that certain credit agreement originally dated September 26, 2018 with SMFH, as borrower (the “2018 SEACOR Marine Foreign Holdings Credit Facility”), (b) $ 11.0 million incurred under that certain credit agreement originally dated July 5, 2018 with SEACOR 88 LLC and SEACOR 888 LLC, as borrowers (the “SEACOR 88/888 Term Loan”), (c) $ 15.1 million incurred under that certain second amended and restated credit agreement originally dated December 31, 2021 with SEACOR Brave LLC, SEACOR Chief LLC, SEACOR Fearless LLC, SEACOR Courageous LLC and SEACOR Resolute LLC, as borrowers (“SEACOR Offshore OSV Credit Facility”), (d) $ 13.7 million incurred under that certain financing related to the sale and purchase agreement dated May 31, 2020 with respect to the acquisition of 50 % membership interest in SEACOR Offshore Delta LLC (formerly known as SEACOSCO Offshore LLC) (“SEACOR Offshore Delta (f/k/a SEACOSCO) Acquisition Debt”), and (e) $ 3.9 million incurred under that certain loan agreement dated February 25, 2021 with SEACOR Marine LLC as borrower, with respect to the acquisition of the SEACOR Tarahumara, a 2021 build 221’ platform support vessel (“Tarahumara Shipyard Financing”), which payoff amount reflects a 7 % discount to book value, (y) acquire 100 % ownership of the Amy Clemons McCall, a 2014 build fast support vessel, previously operated under lease and now pledged as collateral under the 2023 SEACOR Marine Foreign Holdings Credit Facility, and (z) satisfy accrued and unpaid interest, fees, and general corporate purposes. The funds available under the 2023 SEACOR Marine Foreign Holdings Credit Facility were fully drawn on September 14, 2023. The 2023 SEACOR Marine Foreign Holdings Credit Facility matures on September 14, 2028, with quarterly amortization of 2.5 % of the initial loan advanced thereunder, with the remaining outstanding principal amount due on the maturity date. The 2023 SEACOR Marine Foreign Holdings Credit Facility bears interest at a fixed rate of 11.75 % per annum. The loan may be prepaid at any time in amounts of $ 1,000,000 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 decreasing premium ranging from 3.00 % to 1.00 % of the amount prepaid. The 2023 SEACOR Marine Foreign Holdings 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 2023 SEACOR Marine Foreign Holdings Credit Facility restricts the payment of dividends and distributions and the ability of the borrower and subsidiary guarantors to make certain investments, subject to important exceptions. In addition, the 2023 SEACOR Marine Foreign Holdings Credit Facility includes customary events of default. SEACOR Marine issued a guaranty with respect to the obligations of the Borrower under the 2023 SMFH Credit Agreement and related documents (the “2023 SMFH Credit Facility Guaranty”). The 2023 SMFH Credit Facility Guaranty includes, among other customary covenants, various financial covenants, including (A) minimum Cash and Cash Equivalents (as defined in the 2023 SMFH Credit Agreement) of the higher of $ 20.0 million and 7.5 % of Net Interest-Bearing Debt (as defined in the 2023 SMFH Credit Agreement), (B) minimum Equity Ratio (as defined in the 2023 SMFH Credit Agreement) of 35 %, and (C) maximum Debt-to-Capitalization Ratio (as defined in the 2023 SMFH Credit Agreement) of 65 %. The 2023 SMFH Credit Facility Guaranty also restricts the payment of dividends and distributions and includes certain restrictions on the prepayment of unsecured indebtedness. During the three months ended September 30, 2023, the Company expensed of $ 1.8 million of payments for early terminations fees and $ 0.2 million of unamortized debt issuance costs related to the debt extinguishment. 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 SEACOR Marine, 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 (“SM Alpine”), 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 made available to the SEACOR Alpine Borrowers in three tranches and were used to satisfy in full amounts outstanding under certain shipyard financing provided by COSCO Shipping Heavy Industry (Zhoushan) Co. in connection with the newbuild delivery of three Marshall Islands flagged platform supply vessels to the SEACOR Alpine Borrowers during 2019 and 2020. The funds available under the SEACOR Alpine Credit Facility were fully drawn on June 27, 2023. The SEACOR Alpine Credit Facility matures on June 27, 2028 (the “SEACOR Alpine Maturity Date”). The principal amount of each of the three tranches of the SEACOR Alpine Credit Facility is to be repaid in 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 until the SEACOR Alpine Maturity Date. The SEACOR Alpine Credit Facility bears interest at a fixed rate of 10.25 % per annum. The loan may be prepaid at any time in amounts of $ 500,000 or greater, subject to the payment of prepayment interest in respect of the loan or tranche (or portions thereof) being prepaid as follows: (A) if such prepayment is made prior to the first anniversary of the drawdown date, an amount equal to the greater of (x) the amount of unpaid interest which would have accrued until the first anniversary of the drawdown date and (y) 1.5 % of the principal amount of the loan being prepaid, (B) if such prepayment is made on or after the first anniversary of the drawdown date but prior to the third anniversary of the drawdown date, 1.0 % of the principal amount of the loan being prepaid, and (C) if such prepayment is made on or after the third anniversary of the drawdown date, no prepayment interest shall be payable. The SEACOR Alpine Credit Facility contains customary covenants for financings of this type including financial maintenance and restrictive covenants, including the maintenance of certain ratios such as the aggregate collateral vessel value to the sum of the outstanding principal amounts of the loans. The SEACOR Alpine Credit Facility restricts the payment of dividends and distributions and the ability of the SEACOR Alpine Borrowers to make certain investments. In addition, the SEACOR Alpine Credit Facility includes customary events of default. In connection with the SEACOR Alpine Credit Facility, SEACOR Marine issued a guaranty with respect to the obligations of the SEACOR Alpine Borrowers under the SEACOR Alpine Credit Agreement and related documents. This guaranty includes, among other customary covenants, various financial covenants, including minimum liquidity, and debt-to-capitalization and interest coverage ratios. On September 8, 2023, SEACOR Marine entered into an amended and restated guaranty (“A&R SEACOR Alpine Credit Facility Guaranty”) with respect to the SEACOR Alpine Credit Facility. The A&R SEACOR Alpine Credit Facility Guaranty aligns the financial covenants and conditions relating to the payment of dividends and distributions reflected therein with those reflected in the 2023 SMFH Credit Facility Guaranty described above. Letters of Credit . As of September 30, 2023 , the Company had outstanding letters of credit of $ 1.1 million securing lease obligations, labor and performance guaranties.

Leases

Leases	9 Months Ended
	Sep. 30, 2023
Leases [Abstract]
Leases	6. LEASES As of September 30, 2023 , the Company leased-in one AHTS and 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 September 30, 2023 , the remaining lease term of the vessel had a duration of 12 months. The lease terms of certain facilities and other equipment had a duration ranging from two to 279 months. As of September 30, 2023, future minimum payments for leases for the remainder of 2023 and the years ended December 31, noted below, were as follows (in thousands): Operating Leases Finance Leases Remainder of 2023 $ 489 $ 9 2024 1,807 37 2025 687 6 2026 459 — 2027 400 — Years subsequent to 2027 3,213 — 7,055 52 Interest component ( 1,628 ) ( 2 ) 5,427 50 Current portion of long-term lease liabilities 1,856 35 Long-term lease liabilities $ 3,571 $ 15 For the three and nine months ended September 30, 2023 and 2022 the components of lease expense were as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Operating lease costs $ 551 $ 967 $ 1,661 $ 2,664 Finance lease costs: Amortization of finance lease assets (1) 135 162 456 384 Interest on finance lease liabilities (2) 58 73 201 174 Short-term lease costs 100 201 408 572 $ 844 $ 1,403 $ 2,726 $ 3,794 (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 nine months ended September 30, 2023 supplemental cash flow information related to leases was as follows (in thousands): 2023 Operating cash outflows from operating leases $ 1,805 Financing cash outflows from finance leases 522 Right-of-use assets obtained for operating lease liabilities 348 Right-of-use assets obtained for finance lease liabilities — For the nine months ended September 30, 2023 other information related to leases was as follows: 2023 Weighted average remaining lease term, in years - operating leases 10.1 Weighted average remaining lease term, in years - finance leases 1.4 Weighted average discount rate - operating leases 6.7 % Weighted average discount rate - finance leases 4.0 %

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Income Taxes	7. INCOME TAXES The following table reconciles the difference between the statutory federal income tax rate for the Company and the effective income tax rate for the nine months ended September 30, 2023: Statutory rate ( 21.00 )% Foreign taxes, including withholding taxes 33.02 % Subpart F 2.20 % Other 1.10 % Effective income tax rate 15.32 %

Derivative Instruments and Hedg

Derivative Instruments and Hedging Strategies	9 Months Ended
	Sep. 30, 2023
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Strategies	8. 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 were as follows (in thousands): September 30, 2023 December 31, 2022 Derivative Derivative Derivative Derivative Derivatives designated as hedging instruments: Interest rate swap agreements (cash flow hedges) $ — $ — $ 526 $ — 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. As of September 30, 2023, the Company had no open forward currency exchange contracts. Cash Flow Hedges. The Company may have interest rate swap agreements designated as cash flow hedges. By entering into interest rate swap agreements, the Company can convert the variable interest component of certain of their outstanding borrowings to a fixed interest rate. The Company recognized losses on derivative instruments designated as cash flow hedges of $ 0.5 million for the nine months ended September 30, 2023 and gains of $ 2.3 million for the nine months ended September 30, 2022, respectively, as a component of other comprehensive income (loss). As of September 30, 2023, there were no interest rate swaps held by the Company. Other Derivative Instruments. The Company had no derivative instruments not designated as hedging instruments for the three and nine months ended September 30, 2023 and recognized gains on derivative instruments not designated as hedging instruments for the three and nine months ended September 30, 2022 as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Conversion option liability on Old Convertible Notes $ — $ 1 $ — $ — The conversion option liability related to the bifurcated embedded conversion option in the Old Convertible Notes, issued to investment funds managed and controlled by The Carlyle Group, were exchanged for the New Convertible Notes during the fourth quarter of 2022.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2023
Fair Value Disclosures [Abstract]
Fair Value Measurements	9. 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 September 30, 2023 and December 31, 2022 that are measured at fair value on a recurring basis were as follows (in thousands): September 30, 2023 Level 1 Level 2 Level 3 ASSETS Derivative instruments $ — $ — $ — December 31, 2022 ASSETS Derivative instruments $ — $ 526 $ — The estimated fair values of the Company’s other financial assets and liabilities as of September 30, 2023 and December 31, 2022 were as follows (in thousands): Estimated Fair Value September 30, 2023 Carrying Level 1 Level 2 Level 3 ASSETS Cash, cash equivalents and restricted cash $ 58,636 $ 58,636 $ — $ — LIABILITIES Long-term debt, including current portion 319,848 — 304,706 — December 31, 2022 ASSETS Cash, cash equivalents and restricted cash $ 43,045 $ 43,045 $ — $ — LIABILITIES Long-term debt, including current portion 321,631 — 314,979 — The carrying value of cash, cash equivalents and restricted cash 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 nine months ended September 30, 2023 , the Company recognized impairment charges of $ 0.3 million for one leased-in AHTS to adjust for indicative future cash flows. During the year ended December 31, 2022 , the Company recognized impairment charges totaling $ 2.9 million. The Company recorded impairment charges of $ 0.9 million for one FSV classified as held for sale and sold during 2022. In addition, the Company recorded impairment charges of $ 0.7 million for one leased-in AHTS as it is not expected to return to active service during its remaining lease term. Additionally, the Company recorded impairment charges of $ 1.3 million for other equipment and classified such equipment as assets held for sale, which was subsequently sold in the first quarter of 2023.

Warrants

Warrants	9 Months Ended
	Sep. 30, 2023
Warrants and Rights Note Disclosure [Abstract]
Warrants	10. WARRANTS In connection with various transactions, the Company issued 2,560,456 warrants to purchase shares of Common Stock at an exercise price of $ 0.01 per share (“Warrants”). As of September 30, 2023 , 1,321,968 Warrants remain outstanding, which are comprised entirely of warrants issued to funds affiliated with The Carlyle Group.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2023
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	11. COMMITMENTS AND CONTINGENCIES As of September 30, 2023 , the Company had unfunded capital commitments of $ 1.0 million for miscellaneous vessel equipment payable during 2024. The Company has indefinitely deferred an additional $ 9.2 million of orders with respect to one FSV. 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$ 22.6 million based on a historical potential levy of R$ 12.87 million (USD $ 4.5 million and USD $ 2.6 million, respectively, based on the exchange rate as of September 30, 2023). On April 13, 2021, the SEACOR Power, a liftboat owned by a subsidiary of the Company with nineteen individuals on board, capsized off the coast of Port Fourchon, Louisiana. The incident resulted in the death of several crew members, including the captain of the vessel and five other employees of the Company. The incident also resulted in the constructive total loss of the SEACOR Power. In coordination with the U.S. Coast Guard (“USCG”), the Company has completed the salvage operations related to the vessel and the associated salvage costs were covered by insurance proceeds. The National Transportation Safety Board (“NTSB”) and the USCG have each conducted an investigation to determine the cause of the incident and released their respective final reports. The NTSB’s report determined that the probable cause of the capsizing of the SEACOR Power was a loss of stability that occurred when the vessel was struck by severe thunderstorm winds, which exceeded the vessel’s operation wind speed limits. The NTSB further determined that contributing to the loss of life on the vessel was the speed at which the vessel capsized and the angle at which it came to rest, which made egress difficult, and the high winds and seas in the aftermath of the capsizing, which hampered rescue efforts. The USCG’s report is consistent with the determinations of the NTSB. Numerous civil lawsuits have been filed against the Company and other third parties by the family members of deceased crew members and the surviving crew members employed by the Company or by third parties. On June 2, 2021, the Company filed a Limitation of Liability Act complaint in federal court in the Eastern District of Louisiana (“Limitation Action”), which had the effect of enjoining all existing civil lawsuits and requiring the plaintiffs to file their claims relating to the capsizing of the SEACOR Power in the Limitation Action. Nearly all injury and death claims in the Limitation Action for which the Company has financial exposure have been resolved, and the remaining claims are those for which the Company is owed contractual defense and indemnity or will be covered by insurance. 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 September 30, 2023, all invoices related to MNOPF and MNRPF have been settled in full. On October 19, 2021, the Company was informed by the MNRPF that two issues had been identified during a review of the MNRPF by the applicable trustee that would potentially give rise to material additional liabilities for the MNRPF. The MNRPF has indicated that the investigations into these issues remain ongoing, and that further updates will be provided as significant developments arise. Should such additional liabilities require the MNRPF to collect additional funds from participating employers, it is possible that the Company will be invoiced for a portion of such funds and recognize payroll related operating expenses in the periods invoices are received.

Stock Based Compensation

Stock Based Compensation	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Stock Based Compensation	12. STOCK BASED COMPENSATION Transactions in connection with the Company’s Equity Incentive Plans during the nine months ended September 30, 2023 were as follows: Restricted Stock Activity: Outstanding as of December 31, 2022 1,682,193 Granted 660,307 Vested ( 685,416 ) Forfeited ( 15,000 ) Outstanding as of September 30, 2023 (1) 1,642,084 Stock Option Activity: Outstanding as of December 31, 2022 1,026,865 Granted — Exercised ( 834 ) Forfeited — Outstanding as of September 30, 2023 1,026,031 (1) Excludes 156,620 grants of performance-based stock units that are not considered outstanding until such time that they become probable to vest. For the nine months ended September 30, 2023 , the Company acquired for treasury 232,239 shares of Common Stock from its directors and/or employees to cover their tax withholding obligations upon the lapsing of restrictions on share awards for an aggregate purchase price of $ 2.4 million. These shares were purchased in accordance with the terms of the Company’s 2017 Equity Incentive Plan, 2020 Equity Incentive Plan and 2022 Equity Incentive Plan, as applicable.

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2023
Segment Reporting [Abstract]
Segment Information	13. SEGMENT INFORMATION The Company’s segment presentation and basis of measurement of segment profit or loss are as previously described in the 2022 Annual Report. The following tables summarize the operating results, capital expenditures and assets of the Company’s reportable segments for the periods indicated (in thousands): United Africa Middle Latin Total For the Three Months Ended September 30, 2023 Operating Revenues: Time charter $ 16,236 $ 22,528 $ 16,087 $ 13,817 $ 68,668 Bareboat charter — — — 368 368 Other marine services 5,444 815 103 176 6,538 21,680 23,343 16,190 14,361 75,574 Direct Costs and Expenses: Operating: Personnel 6,712 5,089 5,157 2,985 19,943 Repairs and maintenance 1,560 2,214 2,623 1,021 7,418 Drydocking 462 320 1,056 ( 70 ) 1,768 Insurance and loss reserves 332 573 711 217 1,833 Fuel, lubes and supplies 958 2,573 743 773 5,047 Other 341 1,320 779 367 2,807 10,365 12,089 11,069 5,293 38,816 Direct Vessel Profit $ 11,315 $ 11,254 $ 5,121 $ 9,068 36,758 Other Costs and Expenses: Lease expense $ 116 $ 372 $ 59 $ 104 651 Administrative and general 12,300 Depreciation and amortization 3,810 3,821 3,721 2,110 13,462 26,413 Losses on asset dispositions and impairments, net ( 512 ) Operating income $ 9,833 United Africa Middle Latin Total For the Nine Months Ended September 30, 2023 Operating Revenues: Time charter $ 28,921 $ 65,938 $ 48,678 $ 41,350 $ 184,887 Bareboat charter — — — 1,092 1,092 Other marine services 12,279 ( 1,056 ) 3,318 1,918 16,459 41,200 64,882 51,996 44,360 202,438 Direct Costs and Expenses: Operating: Personnel 19,204 14,427 15,264 10,795 59,690 Repairs and maintenance 4,327 6,817 4,519 3,559 19,222 Drydocking 2,011 1,648 ( 723 ) 1,101 4,037 Insurance and loss reserves 2,455 1,311 2,616 630 7,012 Fuel, lubes and supplies 2,665 6,207 2,310 2,322 13,504 Other 899 4,356 2,340 1,331 8,926 31,561 34,766 26,326 19,738 112,391 Direct Vessel Profit $ 9,639 $ 30,116 $ 25,670 $ 24,622 90,047 Other Costs and Expenses: Lease expense $ 395 $ 1,209 $ 202 $ 263 2,069 Administrative and general 37,636 Depreciation and amortization 11,206 11,599 11,117 6,877 40,799 80,504 Gains on asset dispositions and impairments, net 3,352 Operating income $ 12,895 As of September 30, 2023 Property and Equipment: Historical Cost $ 215,592 $ 272,312 $ 285,721 $ 162,895 $ 936,520 Accumulated Depreciation ( 96,597 ) ( 89,338 ) ( 98,481 ) ( 34,133 ) ( 318,549 ) $ 118,995 $ 182,974 $ 187,240 $ 128,762 $ 617,971 Total Assets (1) $ 155,613 $ 212,048 $ 210,401 $ 147,479 $ 725,541 (1) Total assets by region does not include corporate assets of $ 54.8 million as of September 30, 2023 . United Africa Middle Latin Total For the Three Months Ended September 30, 2022 Operating Revenues: Time charter $ 17,075 $ 17,551 $ 11,712 $ 10,162 $ 56,500 Bareboat charter — — — 332 332 Other marine services 2,161 60 319 419 2,959 19,236 17,611 12,031 10,913 59,791 Direct Costs and Expenses: Operating: Personnel 7,243 4,694 5,384 2,831 20,152 Repairs and maintenance 2,002 2,110 1,776 1,489 7,377 Drydocking 1,549 383 3,113 1 5,046 Insurance and loss reserves 1,382 359 762 347 2,850 Fuel, lubes and supplies 1,143 2,284 1,426 563 5,416 Other 314 1,580 878 393 3,165 13,633 11,410 13,339 5,624 44,006 Direct Vessel Profit (Loss) $ 5,603 $ 6,201 $ ( 1,308 ) $ 5,289 15,785 Other Costs and Expenses: Lease expense $ 278 $ 455 $ 35 $ 400 1,168 Administrative and general 9,978 Depreciation and amortization 4,332 3,461 3,974 1,987 13,754 24,900 Losses on asset dispositions and impairments, net ( 1,783 ) Operating loss $ ( 10,898 ) United Africa Middle Latin Total For the Nine Months Ended September 30, 2022 Operating Revenues: Time charter $ 34,698 $ 44,761 $ 39,278 $ 30,008 $ 148,745 Bareboat charter — — — 998 998 Other 6,612 516 828 1,700 9,656 41,310 45,277 40,106 32,706 159,399 Direct Costs and Expenses: Operating: Personnel 17,939 11,756 17,106 10,132 56,933 Repairs and maintenance 4,383 6,327 6,153 5,685 22,548 Drydocking 8,506 1,661 6,325 1 16,493 Insurance and loss reserves 2,809 812 2,017 943 6,581 Fuel, lubes and supplies 2,599 5,247 3,754 1,895 13,495 Other 819 5,279 3,718 1,781 11,597 37,055 31,082 39,073 20,437 127,647 Direct Vessel Profit $ 4,255 $ 14,195 $ 1,033 $ 12,269 31,752 Other Costs and Expenses: Lease expense $ 860 $ 1,313 $ 104 $ 959 3,236 Administrative and general 30,112 Depreciation and amortization 13,532 10,025 12,548 6,228 42,333 75,681 Gains on asset dispositions and impairments, net 381 Operating loss $ ( 43,548 ) As of September 30, 2022 Property and Equipment: Historical Cost $ 259,472 $ 247,967 $ 305,880 $ 179,104 $ 992,423 Accumulated Depreciation ( 122,340 ) ( 80,069 ) ( 91,906 ) ( 27,583 ) ( 321,898 ) $ 137,132 $ 167,898 $ 213,974 $ 151,521 $ 670,525 Total Assets (1) $ 177,463 $ 187,495 $ 231,165 $ 167,021 $ 763,144 (1) Total assets by region does not include corporate assets of $ 79.8 million as of September 30, 2022 . The Company’s investments in 50 % or less owned companies, which are accounted for under the equity method, also contribute to its consolidated results of operations. As of September 30, 2023, and 2022 , the Company’s investments, at equity and advances to 50 % or less owned companies in its other 50 % or less owned companies were $ 3.9 million and $ 1.9 million, respectively. Equity in earnings of 50% or less owned companies for the nine months ended September 30, 2023 and 2022 were $ 3.2 million and $ 5.8 million, respectively.

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2023
Subsequent Events [Abstract]
Subsequent Events	14. SUBSEQUENT EVENTS The Company has evaluated subsequent events through the filing of this Quarterly Report on Form 10-Q 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.

Basis of Presentation and Acc_2

Basis of Presentation and Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2023
Accounting Policies [Abstract]
Recently Adopted Accounting Standards	Recently Adopted Accounting Standards. On October 29, 2020, the FASB issued ASU 2020-10, Codification Improvements: Amendments that improve the consistency of the Codification by including all disclosure guidance in the appropriate disclosure section. The guidance was effective for annual periods beginning after December 15, 2020, and interim periods within the annual periods beginning after December 15, 2022. The adoption of the standard did not have a material effect on the disclosures included herein.
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. Such estimates include those related to deferred revenues, allowance for credit loss accounts, useful lives of property and equipment, impairments, income tax provisions and certain accrued liabilities. Actual results could differ from estimates and those differences may be material.
Revenue Recognition	Revenue Recognition . Revenue is recognized when (or as) the Company transfers promised goods or services to its customers in amounts that reflect the consideration to which the Company expects to be entitled to in exchange for those goods or services, which occurs when (or as) the Company satisfies its contractual obligations and transfers over control of the promised goods or services to its customers. The Company recognizes revenue, net of sales taxes, based on its estimates of the consideration the Company expects to receive. Costs to obtain or fulfill a contract are expensed as incurred. 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 Mexico, 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, contract 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 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. 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 deferred revenue and unearned revenue in the accompanying consolidated balance sheets, as of September 30, 2023 and December 31, 2022 were as follows (in thousands): 2023 2022 Balance at beginning of period $ 2,333 $ 1,606 Revenues deferred during the period 6,075 4,288 Revenues recognized during the period ( 6,943 ) ( 3,561 ) Balance at end of period $ 1,465 $ 2,333 As of September 30, 2023 , the Company had $ 1.5 million of unearned revenue primarily related to mobilization of vessels.
Cash and Cash Equivalents	Cash and 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.
Restricted Cash	Restricted Cash. Restricted cash primarily relates to banking facility requirements.
Trade and Other Receivables	Trade and Other Receivables. 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, but excludes our short-term note receivable. The Company routinely reviews its receivables and makes provisions for the 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. Trade receivables are deemed uncollectible and are removed from accounts receivable and the allowance for credit losses when collection efforts have been exhausted.
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 remaining useful life, typically the next survey or certification date. As of September 30, 2023 , the estimated useful life of the Company’s new offshore support vessels was 20 years. 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 during the nine months ended September 30, 2023 and 2022 .
Assets Held for Sale	Assets Held for Sale. As of September 30, 2023, a liftboat previously included in the United States, primarily Gulf of Mexico segment, with a carrying value of $ 5.6 million and a AHTS previously included in the Africa and Europe segment, with a carrying value of $ 0.5 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. For the nine months ended September 30, 2023 , the Company recorded impairment charges of $ 0.3 million for one leased-in anchor handling towing supply vessel (“AHTS”) to adjust for indicative future cash flows. There were no impairment s of other owned or leased-in vessels. For the nine months ended September 30, 2022 , the Company recorded impairment charges of $ 3.4 million. The Company recorded impairment charges of $ 0.9 million for one fast support vessel (“FSV”) classified as held for sale during the first quarter of 2022 and sold during the second quarter of 2022. In addition, in the third quarter of 2022, the Company recorded impairment charges of $ 1.2 million for one leased-in AHTS as it was not expected to return to active service during its remaining lease term. Additionally, the Company recorded impairment charges of $ 1.3 million for other equipment, classified as assets held for sale during the third quarter of 2022, which was subsequently sold in the first quarter of 2023. The impairment charges for the assets held for sale are included in (losses) gains on asset dispositions and impairments in the accompanying consolidated statements of income (loss). Estimated fair values for the Company owned vessels were established by independent appraisers based on researched market information, replacement cost information and other data. For vessel classes and individual vessels with indicators of impairment as of September 30, 2023, 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. During the nine months ended September 30, 2023 and 2022 , the Company did no t recognize any impairment charges related to its 50% or less owned companies.
Income Taxes	Income Taxes. During the nine months ended September 30, 2023 , the Company’s effective income tax rate of 15.32 % was primarily due to foreign taxes paid that are not creditable against U.S. income taxes.
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss). The components of accumulated other comprehensive income were as follows (in thousands): SEACOR Marine Holdings Inc. Foreign Derivative Total Other December 31, 2022 $ 6,332 $ 515 $ 6,847 Other comprehensive loss ( 79 ) ( 515 ) ( 594 ) Balance as of September 30, 2023 $ 6,253 $ — $ 6,253
Earnings (Loss) Per Share	Earnings ( Loss) Per Share. Basic earnings/loss per share of Common Stock of the Company 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 Old Convertible Notes and the New Convertible Notes unless anti-dilutive. For the three and nine months ended September 30, 2023 , diluted loss per share of Common Stock excluded 2,978,724 shares of Common Stock issuable upon conversion of the New Convertible Notes as the effect of their inclusion in the computation would be anti-dilutive. For the three and nine months ended September 30, 2022 , diluted loss per share of Common Stock excluded 2,907,500 shares of Common Stock issuable upon conversion of the Old Convertible Notes as the effect of their inclusion in the computation would be anti-dilutive. In addition, for the three and nine months ended September 30, 2023 and 2022 diluted loss per share of Common Stock excluded 1,642,084 and 1,645,207 shares of restricted stock, respectively, and 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.

Basis of Presentation and Acc_3

Basis of Presentation and Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2023
Basis Of Presentation 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 deferred revenue and unearned revenue in the accompanying consolidated balance sheets, as of September 30, 2023 and December 31, 2022 were as follows (in thousands): 2023 2022 Balance at beginning of period $ 2,333 $ 1,606 Revenues deferred during the period 6,075 4,288 Revenues recognized during the period ( 6,943 ) ( 3,561 ) Balance at end of period $ 1,465 $ 2,333
Schedule of Accumulated Other Comprehensive Income (Loss)	The components of accumulated other comprehensive income were as follows (in thousands): SEACOR Marine Holdings Inc. Foreign Derivative Total Other December 31, 2022 $ 6,332 $ 515 $ 6,847 Other comprehensive loss ( 79 ) ( 515 ) ( 594 ) Balance as of September 30, 2023 $ 6,253 $ — $ 6,253

Investments, at Equity, and A_2

Investments, at Equity, and Advances to 50% or Less Owned Companies (Tables)	9 Months Ended
	Sep. 30, 2023
Schedule of Investments [Abstract]
Equity Method Investments	Investments, at equity, and advances to 50% or less owned companies as of September 30, 2023 and December 31, 2022 were as follows (in thousands): Ownership 2023 2022 Seabulk Angola 49.0 % 1,986 1,683 SEACOR Arabia 45.0 % 1,803 1,265 Other 20.0 % - 50.0 % 68 76 $ 3,857 $ 3,024

Long-term Debt (Tables)

Long-term Debt (Tables)	9 Months Ended
	Sep. 30, 2023
Debt Disclosure [Abstract]
Schedule of Long-term Debt Obligations	The Company’s long-term debt obligations as of September 30, 2023 and December 31, 2022 were as follows (in thousands): September 30, 2023 December 31, 2022 Recourse long-term debt (1) : Guaranteed Notes $ 90,000 $ 90,000 New Convertible Notes 35,000 35,000 2023 SEACOR Marine Foreign Holdings Credit Facility (2) 122,000 — 2018 SEACOR Marine Foreign Holdings Credit Facility (2) — 67,910 Sea-Cat Crewzer III Term Loan Facility 14,227 16,703 SEACOR Offshore Delta (f/k/a SEACOSCO) Acquisition Debt (2) — 16,205 SEACOR Delta (f/k/a SEACOSCO) Shipyard Financing 70,869 77,537 SEACOR Alpine Credit Facility (3) 27,100 — SEACOR Alpine Shipyard Financing (3) — 27,790 SEACOR 88/888 Term Loan (2) — 5,500 Tarahumara Shipyard Financing (2) — 5,597 SEACOR Offshore OSV (2) — 16,052 Total recourse long-term debt 359,196 358,294 Non-recourse long-term debt (3) : SEACOR 88/888 Term Loan (2) — 5,500 Total non-recourse long-term debt — 5,500 Total principal due for long-term debt 359,196 363,794 Current portion due within one year ( 28,005 ) ( 61,512 ) Unamortized debt discount ( 34,747 ) ( 37,511 ) Deferred financing costs ( 4,601 ) ( 4,652 ) Long-term debt, less current portion $ 291,843 $ 260,119 (1) Recourse debt represents debt issued by SEACOR Marine and/or its subsidiaries and guaranteed by SEACOR Marine or one of its operating subsidiaries as provided in the relevant debt agreements. (2) Proceeds from the 2023 SEACOR Marine Foreign Holdings Credit Facility, dated September 8, 2023, were used to satisfy in full the 2018 SEACOR Marine Foreign Holdings Credit Facility, the SEACOR Offshore Delta (f/k/a SEACOSCO) Acquisition Debt, the SEACOR 88/888 Term Loan, the Tarahumara Shipyard Financing and the SEACOR Offshore OSV debt. See details below. (3) Proceeds from the SEACOR Alpine Credit Facility, dated June 16, 2023, were used to satisfy in full the SEACOR Alpine Shipyard Financing. See details below. (4) Non-recourse debt represents debt issued by one of the Company’s consolidated subsidiaries with no recourse to SEACOR Marine or its other non-debtor operating subsidiaries with respect to the applicable instrument, other than certain limited support obligations as provided in the respective debt agreements, which in aggregate are not considered to be material to the Company’s business and financial condition.

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2023
Leases [Abstract]
Summary of Future Minimum Payments for Leases	As of September 30, 2023, future minimum payments for leases for the remainder of 2023 and the years ended December 31, noted below, were as follows (in thousands): Operating Leases Finance Leases Remainder of 2023 $ 489 $ 9 2024 1,807 37 2025 687 6 2026 459 — 2027 400 — Years subsequent to 2027 3,213 — 7,055 52 Interest component ( 1,628 ) ( 2 ) 5,427 50 Current portion of long-term lease liabilities 1,856 35 Long-term lease liabilities $ 3,571 $ 15
Summary of Components of Leases Expense	For the three and nine months ended September 30, 2023 and 2022 the components of lease expense were as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Operating lease costs $ 551 $ 967 $ 1,661 $ 2,664 Finance lease costs: Amortization of finance lease assets (1) 135 162 456 384 Interest on finance lease liabilities (2) 58 73 201 174 Short-term lease costs 100 201 408 572 $ 844 $ 1,403 $ 2,726 $ 3,794 (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 nine months ended September 30, 2023 supplemental cash flow information related to leases was as follows (in thousands): 2023 Operating cash outflows from operating leases $ 1,805 Financing cash outflows from finance leases 522 Right-of-use assets obtained for operating lease liabilities 348 Right-of-use assets obtained for finance lease liabilities —
Summary of Other Information Related to Leases	For the nine months ended September 30, 2023 other information related to leases was as follows: 2023 Weighted average remaining lease term, in years - operating leases 10.1 Weighted average remaining lease term, in years - finance leases 1.4 Weighted average discount rate - operating leases 6.7 % Weighted average discount rate - finance leases 4.0 %

Income Taxes (Tables)

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2023
Income Tax Disclosure [Abstract]
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 nine months ended September 30, 2023: Statutory rate ( 21.00 )% Foreign taxes, including withholding taxes 33.02 % Subpart F 2.20 % Other 1.10 % Effective income tax rate 15.32 %

Derivative Instruments and He_2

Derivative Instruments and Hedging Strategies (Tables)	9 Months Ended
	Sep. 30, 2023
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 were as follows (in thousands): September 30, 2023 December 31, 2022 Derivative Derivative Derivative Derivative Derivatives designated as hedging instruments: Interest rate swap agreements (cash flow hedges) $ — $ — $ 526 $ —
Schedule of Gains on Derivative Instruments not Designated as Hedging Instruments	The Company had no derivative instruments not designated as hedging instruments for the three and nine months ended September 30, 2023 and recognized gains on derivative instruments not designated as hedging instruments for the three and nine months ended September 30, 2022 as follows (in thousands): Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Conversion option liability on Old Convertible Notes $ — $ 1 $ — $ —

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2023
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 September 30, 2023 and December 31, 2022 that are measured at fair value on a recurring basis were as follows (in thousands): September 30, 2023 Level 1 Level 2 Level 3 ASSETS Derivative instruments $ — $ — $ — December 31, 2022 ASSETS Derivative instruments $ — $ 526 $ —
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 September 30, 2023 and December 31, 2022 were as follows (in thousands): Estimated Fair Value September 30, 2023 Carrying Level 1 Level 2 Level 3 ASSETS Cash, cash equivalents and restricted cash $ 58,636 $ 58,636 $ — $ — LIABILITIES Long-term debt, including current portion 319,848 — 304,706 — December 31, 2022 ASSETS Cash, cash equivalents and restricted cash $ 43,045 $ 43,045 $ — $ — LIABILITIES Long-term debt, including current portion 321,631 — 314,979 —

Stock Based Compensation (Table

Stock Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Schedule of Equity Incentive Plan Transactions	Transactions in connection with the Company’s Equity Incentive Plans during the nine months ended September 30, 2023 were as follows: Restricted Stock Activity: Outstanding as of December 31, 2022 1,682,193 Granted 660,307 Vested ( 685,416 ) Forfeited ( 15,000 ) Outstanding as of September 30, 2023 (1) 1,642,084 Stock Option Activity: Outstanding as of December 31, 2022 1,026,865 Granted — Exercised ( 834 ) Forfeited — Outstanding as of September 30, 2023 1,026,031 (1) Excludes 156,620 grants of performance-based stock units that are not considered outstanding until such time that they become probable to vest.

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2023
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 Africa Middle Latin Total For the Three Months Ended September 30, 2023 Operating Revenues: Time charter $ 16,236 $ 22,528 $ 16,087 $ 13,817 $ 68,668 Bareboat charter — — — 368 368 Other marine services 5,444 815 103 176 6,538 21,680 23,343 16,190 14,361 75,574 Direct Costs and Expenses: Operating: Personnel 6,712 5,089 5,157 2,985 19,943 Repairs and maintenance 1,560 2,214 2,623 1,021 7,418 Drydocking 462 320 1,056 ( 70 ) 1,768 Insurance and loss reserves 332 573 711 217 1,833 Fuel, lubes and supplies 958 2,573 743 773 5,047 Other 341 1,320 779 367 2,807 10,365 12,089 11,069 5,293 38,816 Direct Vessel Profit $ 11,315 $ 11,254 $ 5,121 $ 9,068 36,758 Other Costs and Expenses: Lease expense $ 116 $ 372 $ 59 $ 104 651 Administrative and general 12,300 Depreciation and amortization 3,810 3,821 3,721 2,110 13,462 26,413 Losses on asset dispositions and impairments, net ( 512 ) Operating income $ 9,833 United Africa Middle Latin Total For the Nine Months Ended September 30, 2023 Operating Revenues: Time charter $ 28,921 $ 65,938 $ 48,678 $ 41,350 $ 184,887 Bareboat charter — — — 1,092 1,092 Other marine services 12,279 ( 1,056 ) 3,318 1,918 16,459 41,200 64,882 51,996 44,360 202,438 Direct Costs and Expenses: Operating: Personnel 19,204 14,427 15,264 10,795 59,690 Repairs and maintenance 4,327 6,817 4,519 3,559 19,222 Drydocking 2,011 1,648 ( 723 ) 1,101 4,037 Insurance and loss reserves 2,455 1,311 2,616 630 7,012 Fuel, lubes and supplies 2,665 6,207 2,310 2,322 13,504 Other 899 4,356 2,340 1,331 8,926 31,561 34,766 26,326 19,738 112,391 Direct Vessel Profit $ 9,639 $ 30,116 $ 25,670 $ 24,622 90,047 Other Costs and Expenses: Lease expense $ 395 $ 1,209 $ 202 $ 263 2,069 Administrative and general 37,636 Depreciation and amortization 11,206 11,599 11,117 6,877 40,799 80,504 Gains on asset dispositions and impairments, net 3,352 Operating income $ 12,895 As of September 30, 2023 Property and Equipment: Historical Cost $ 215,592 $ 272,312 $ 285,721 $ 162,895 $ 936,520 Accumulated Depreciation ( 96,597 ) ( 89,338 ) ( 98,481 ) ( 34,133 ) ( 318,549 ) $ 118,995 $ 182,974 $ 187,240 $ 128,762 $ 617,971 Total Assets (1) $ 155,613 $ 212,048 $ 210,401 $ 147,479 $ 725,541 (1) Total assets by region does not include corporate assets of $ 54.8 million as of September 30, 2023 . United Africa Middle Latin Total For the Three Months Ended September 30, 2022 Operating Revenues: Time charter $ 17,075 $ 17,551 $ 11,712 $ 10,162 $ 56,500 Bareboat charter — — — 332 332 Other marine services 2,161 60 319 419 2,959 19,236 17,611 12,031 10,913 59,791 Direct Costs and Expenses: Operating: Personnel 7,243 4,694 5,384 2,831 20,152 Repairs and maintenance 2,002 2,110 1,776 1,489 7,377 Drydocking 1,549 383 3,113 1 5,046 Insurance and loss reserves 1,382 359 762 347 2,850 Fuel, lubes and supplies 1,143 2,284 1,426 563 5,416 Other 314 1,580 878 393 3,165 13,633 11,410 13,339 5,624 44,006 Direct Vessel Profit (Loss) $ 5,603 $ 6,201 $ ( 1,308 ) $ 5,289 15,785 Other Costs and Expenses: Lease expense $ 278 $ 455 $ 35 $ 400 1,168 Administrative and general 9,978 Depreciation and amortization 4,332 3,461 3,974 1,987 13,754 24,900 Losses on asset dispositions and impairments, net ( 1,783 ) Operating loss $ ( 10,898 ) United Africa Middle Latin Total For the Nine Months Ended September 30, 2022 Operating Revenues: Time charter $ 34,698 $ 44,761 $ 39,278 $ 30,008 $ 148,745 Bareboat charter — — — 998 998 Other 6,612 516 828 1,700 9,656 41,310 45,277 40,106 32,706 159,399 Direct Costs and Expenses: Operating: Personnel 17,939 11,756 17,106 10,132 56,933 Repairs and maintenance 4,383 6,327 6,153 5,685 22,548 Drydocking 8,506 1,661 6,325 1 16,493 Insurance and loss reserves 2,809 812 2,017 943 6,581 Fuel, lubes and supplies 2,599 5,247 3,754 1,895 13,495 Other 819 5,279 3,718 1,781 11,597 37,055 31,082 39,073 20,437 127,647 Direct Vessel Profit $ 4,255 $ 14,195 $ 1,033 $ 12,269 31,752 Other Costs and Expenses: Lease expense $ 860 $ 1,313 $ 104 $ 959 3,236 Administrative and general 30,112 Depreciation and amortization 13,532 10,025 12,548 6,228 42,333 75,681 Gains on asset dispositions and impairments, net 381 Operating loss $ ( 43,548 ) As of September 30, 2022 Property and Equipment: Historical Cost $ 259,472 $ 247,967 $ 305,880 $ 179,104 $ 992,423 Accumulated Depreciation ( 122,340 ) ( 80,069 ) ( 91,906 ) ( 27,583 ) ( 321,898 ) $ 137,132 $ 167,898 $ 213,974 $ 151,521 $ 670,525 Total Assets (1) $ 177,463 $ 187,495 $ 231,165 $ 167,021 $ 763,144 (1) Total assets by region does not include corporate assets of $ 79.8 million as of September 30, 2022 .

Basis of Presentation and Acc_4

Basis of Presentation and Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021
Basis Of Presentation And Accounting Policies [Line Items]
Unearned revenue	$ 1,465,000			$ 1,465,000		$ 2,333,000	$ 1,606,000
Estimated useful life (Year)	20 years			20 years
Capitalized interest costs, including allowance for funds used during construction, total				$ 0	$ 0
Assets held for sale	$ 6,093,000			$ 6,093,000		6,750,000
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]				Gains on asset dispositions and impairments, net	Gains on asset dispositions and impairments, net
Impairment of long-lived assets owned or leased in vessels				$ 0	$ 3,400,000
Equity method investment, other than temporary impairment				$ 0	$ 0
Effective income tax rate reconciliation, percent, total				15.32%
Class of warrant or right, exercise price of warrants or rights	$ 0.01			$ 0.01
Africa and Europe, Continuing Operations
Basis Of Presentation And Accounting Policies [Line Items]
Assets held for sale	$ 500,000			$ 500,000
UNITED STATES
Basis Of Presentation And Accounting Policies [Line Items]
Assets held for sale	$ 5,600,000			$ 5,600,000
Convertible Debt Securities
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount	2,978,724	2,907,500		2,978,724	2,907,500
Restricted Stock
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount	1,642,084	1,645,207		1,642,084	1,645,207
Employee Stock Option
Basis Of Presentation And Accounting Policies [Line Items]
Antidilutive securities excluded from computation of loss per share, amount	1,026,031	1,026,865		1,026,031	1,026,865
Fast Support Vessel
Basis Of Presentation And Accounting Policies [Line Items]
Impairment charges			$ 900,000			900,000
Anchor Handling Towing Supply Vessel
Basis Of Presentation And Accounting Policies [Line Items]
Impairment of long-lived assets owned or leased in vessels		$ 1,200,000		$ 300,000		700,000
Tower and Gangway
Basis Of Presentation And Accounting Policies [Line Items]
Impairment charges		$ 1,300,000				$ 1,300,000
Equity Investments in 50% or Less Owned Companies | Minimum
Basis Of Presentation And Accounting Policies [Line Items]
Equity method investment, ownership percentage	20%			20%
Equity Investments in 50% or Less Owned Companies | Maximum
Basis Of Presentation And Accounting Policies [Line Items]
Equity method investment, ownership percentage	50%	50%		50%	50%
Equity Investments in 50% or Less Owned Companies | SEACOR Marine Foreign Holdings | Minimum
Basis Of Presentation And Accounting Policies [Line Items]
Equity method investment, ownership percentage	50%			50%
Accounting Standards Update 2020-10
Basis Of Presentation And Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted [true false]	true			true
Change in accounting principle, accounting standards update, immaterial effect [true false]	true			true

Basis of Presentation and Acc_5

Basis of Presentation and Accounting Policies - Schedule of Deferred Revenues (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Basis Of Presentation And Accounting Policies [Abstract]
Balance at beginning of period	$ 2,333	$ 1,606
Revenues deferred during the period	6,075	4,288
Revenues recognized during the period	(6,943)	(3,561)
Balance at end of period	$ 1,465	$ 2,333

Basis of Presentation and Acc_6

Basis of Presentation and Accounting Policies - Schedule of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	$ 366,855	$ 413,507	$ 379,146	$ 446,541
Other comprehensive loss	(1,875)	(1,411)	(594)	(3,506)
Balance	365,637	388,970	365,637	388,970
Accumulated Foreign Currency Adjustment Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			6,332
Other comprehensive loss			(79)
Balance	6,253		6,253
Derivative Gains (Losses) on Cash Flow Hedges, net Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance			515
Other comprehensive loss			(515)
Balance	0		0
AOCI Attributable to Parent
Accumulated Other Comprehensive Income Loss [Line Items]
Balance	8,128	5,960	6,847	8,055
Other comprehensive loss			(594)
Balance	$ 6,253	$ 4,549	$ 6,253	$ 4,549

Note Receivable - Additional In

Note Receivable - Additional Information (Details) - USD ($)		9 Months Ended
	Sep. 29, 2022	Sep. 30, 2023	Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Prepayment of outstanding loan		$ 1,827,000	$ 0
MexMar Original Facility Agreement | Term Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal of loan	$ 28,800,000
MexMar Third A&R Facility Agreement | Term Loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding principal of loan	20,000,000
Prepayment of outstanding loan	$ 8,800,000
Maturity date	Sep. 30, 2023
Frequency of principal repayment	four quarterly installments
Principal repayment of loan	$ 5,000,000

Equipment Acquisitions and Di_2

Equipment Acquisitions and Dispositions - Additional Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Mar. 31, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($) Vessel
Property Plant And Equipment [Line Items]
Proceeds from disposition of property and equipment		$ 8,038	$ 6,681
Gain (loss) on disposition of property, plant and equipment			$ 2,200
Platform Supply Vessels
Property Plant And Equipment [Line Items]
Payments to acquire property, plant, and equipment, including fair value hedges		7,000
Fast Support Vessels
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel			1
Impairment charges	$ 900
Liftboat
Property Plant And Equipment [Line Items]
Number of equipment sold | Vessel			1
Proceeds from disposition of property and equipment			$ 6,700
Platform Supply Vessels And Fast Support Vessels
Property Plant And Equipment [Line Items]
Proceeds from disposition of property and equipment		8,000
Gain (loss) on disposition of property, plant and equipment		$ 2,700

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	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Schedule Of Investments [Line Items]
Investments at equity	$ 3,857	$ 3,024
Seabulk Angola
Schedule Of Investments [Line Items]
Ownership percentage	49%
Investments at equity	$ 1,986	1,683
SEACOR Arabia
Schedule Of Investments [Line Items]
Ownership percentage	45%
Investments at equity	$ 1,803	1,265
Other Offshore Marine Services Joint Ventures
Schedule Of Investments [Line Items]
Investments at equity	$ 68	$ 76	$ 1,900
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%		50%

Long Term Debt - Schedule of Lo

Long Term Debt - Schedule of Long-term Debt Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 359,196	$ 363,794
Current portion due within one year	(28,005)	(61,512)
Unamortized debt discount	(34,747)	(37,511)
Deferred financing costs	(4,601)	(4,652)
Long-term debt, less current portion	291,843	260,119
Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	359,196	358,294
Non-Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	0	5,500
Guaranteed Notes | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	90,000	90,000
New Convertible Notes | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	35,000	35,000
2023 SEACOR Marine Foreign Holdings Credit Facility | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	122,000	0
2018 SEACOR Marine Foreign Holdings Credit Facility | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	0	67,910
Sea-Cat Crewzer III Term Loan Facility | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	14,227	16,703
SEACOR Offshore Delta (f/k/a SEACOSCO) Acquisition Debt | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	0	16,205
SEACOR Delta (f/k/a SEACOSCO) Shipyard Financing | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	70,869	77,537
SEACOR Alpine Credit Facility | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	27,100	0
SEACOR Alpine Shipyard Financing | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	0	27,790
SEACOR 88/888 Term Loan | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	0	5,500
SEACOR 88/888 Term Loan | Non-Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	0	5,500
Tarahumara Shipyard Financing | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	0	5,597
SEACOR Offshore OSV | Recourse Long-Term Debt
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 0	$ 16,052

Long Term Debt - Additional Inf

Long Term Debt - Additional Information (Details)			3 Months Ended	9 Months Ended
	Sep. 08, 2023 USD ($)	Jun. 16, 2023 USD ($) Installments	Sep. 30, 2023 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Feb. 25, 2021 USD ($)	May 31, 2020 USD ($)	Sep. 26, 2018 USD ($)	Jul. 05, 2018 USD ($)
Debt Instrument [Line Items]
Letters of credit outstanding, amount			$ 1,100,000	$ 1,100,000
Payments on debt extinguishment cost				$ 1,827,000	$ 0
SEACOR Alpine Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity		$ 28,000,000
Bears fixed interest rate		10.25%
Debt instrument payment terms				The loan may be prepaid at any time in amounts of $500,000 or greater, subject to the payment of prepayment interest in respect of the loan or tranche (or portions thereof) being prepaid as follows: (A) if such prepayment is made prior to the first anniversary of the drawdown date, an amount equal to the greater of (x) the amount of unpaid interest which would have accrued until the first anniversary of the drawdown date and (y) 1.5% of the principal amount of the loan being prepaid, (B) if such prepayment is made on or after the first anniversary of the drawdown date but prior to the third anniversary of the drawdown date, 1.0% of the principal amount of the loan being prepaid, and (C) if such prepayment is made on or after the third anniversary of the drawdown date, no prepayment interest shall be payable.
Prepayment interest		$ 0
SEACOR Alpine Credit Facility | Tranche One
Debt Instrument [Line Items]
Repaid principal amount		$ 100,000
Number of installments | Installments		8
SEACOR Alpine Credit Facility | Tranche Two
Debt Instrument [Line Items]
Repaid principal amount		$ 140,000
Number of installments | Installments		24
SEACOR Alpine Credit Facility | Tranche Three
Debt Instrument [Line Items]
Repaid principal amount		$ 100,000
SEACOR Alpine Credit Facility | First Anniversary
Debt Instrument [Line Items]
Prepayment interest rate		1.50%
SEACOR Alpine Credit Facility | Third Anniversary
Debt Instrument [Line Items]
Prepayment interest rate		1%
Senior Secured Term Loan with EnTrust Global
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 122,000,000
2023 SEACOR Marine Foreign Holdings Credit Facility
Debt Instrument [Line Items]
Indebtedness	$ 104,800,000
Percentage of quarterly amortization	2.50%
Bears fixed interest rate	11.75%
Debt instrument payment terms				The loan may be prepaid at any time in amounts of $1,000,000 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 decreasing premium ranging from 3.00% to 1.00% of the amount prepaid.
Percentage of minimum equity ratio	35%
Percentage of maximum debt-to-capitalization ratio	65%
Payments on debt extinguishment cost			1,800,000
Unamortized debt issuance costs			$ 200,000	$ 200,000
2023 SEACOR Marine Foreign Holdings Credit Facility | Amy Clemons McCall
Debt Instrument [Line Items]
Percentage of voting interests acquired							100%
2018 SEACOR Marine Foreign Holdings Credit Facility
Debt Instrument [Line Items]
Indebtedness									$ 61,100,000
SEACOR 88/888 Term Loan
Debt Instrument [Line Items]
Indebtedness										$ 11,000,000
Seacor Offshore OSV Credit Facility
Debt Instrument [Line Items]
Indebtedness						$ 15,100,000
SEACOR Offshore Delta (f/k/a SEACOSCO) Acquisition Debt | Merger Agreement | Sale And Purchase Agreement | SEACOR Offshore Delta LLC
Debt Instrument [Line Items]
Indebtedness								$ 13,700,000
Percentage of voting interests acquired								50%
Tarahumara Shipyard Financing | SEACOR Tarahumara
Debt Instrument [Line Items]
Indebtedness							$ 3,900,000
Percentage of discount to book value							7%
Minimum | SEACOR Alpine Credit Facility
Debt Instrument [Line Items]
Principal repayment of loan		$ 500,000
Minimum | 2023 SEACOR Marine Foreign Holdings Credit Facility
Debt Instrument [Line Items]
Principal repayment of loan	$ 1,000,000
Percentage of decreasing premium	1%
Cash and cash equivalents	$ 20,000,000
Cash and cash equivalents, percentage	7.50%
Maximum | 2023 SEACOR Marine Foreign Holdings Credit Facility
Debt Instrument [Line Items]
Percentage of decreasing premium	3%

Leases - Additional Information

Leases - Additional Information (Details)	9 Months Ended
	Sep. 30, 2023 Vessel
Anchor Handling Towing Supply Vessels
Lessee Lease Description [Line Items]
Number of operating leases on equipment	1
Vessel
Lessee Lease Description [Line Items]
Operating and finance lease, lease terms (in duration)	12 months
Other Equipment | Minimum
Lessee Lease Description [Line Items]
Operating lease, lease terms (in duration)	2 months
Other Equipment | Maximum
Lessee Lease Description [Line Items]
Operating lease, lease terms (in duration)	279 months

Leases - Summary of Future Mini

Leases - Summary of Future Minimum Payments For Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Operating Leases
Remainder of 2023	$ 489
2024	1,807
2025	687
2026	459
2027	400
Years subsequent to 2027	3,213
Operating lease payments due	7,055
Interest component	(1,628)
Total operating leases	5,427
Current portion of operating lease liabilities	1,856	$ 2,358
Long-term operating lease liabilities	3,571	4,739
Finance Leases
Remainder of 2023	9
2024	37
2025	6
2026	0
2027	0
Years subsequent to 2027	0
Total finance leases	52
Interest component	(2)
Finance Leases	50
Current portion of finance lease liabilities	35	468
Long-term finance lease liabilities	$ 15	$ 6,781

Leases - Summary of Components

Leases - Summary of Components of Leases Expense (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating lease costs		$ 551	$ 967	$ 1,661	$ 2,664
Finance lease costs:
Amortization of finance lease assets	[1]	135	162	456	384
Interest on lease liabilities	[2]	58	73	201	174
Short-term lease costs		100	201	408	572
Total lease expense		$ 844	$ 1,403	$ 2,726	$ 3,794
[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	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Leases [Abstract]
Operating cash outflows from operating leases	$ 1,805
Financing cash outflows from finance leases	522	$ 237
Right-of-use assets obtained for operating lease liabilities	348
Right-of-use assets obtained for finance lease liabilities	$ 0

Leases - Summary of Other Infor

Leases - Summary of Other Information Related to Leases (Details)	Sep. 30, 2023
Leases [Abstract]
Weighted average remaining lease term, in years - operating leases	10 years 1 month 6 days
Weighted average remaining lease term, in years - finance leases	1 year 4 months 24 days
Weighted average discount rate - operating leases	6.70%
Weighted average discount rate - finance leases	4%

Income Taxes - Schedule of Effe

Income Taxes - Schedule of Effective Income Tax Rate Reconciliation (Details)	9 Months Ended
	Sep. 30, 2023
Effective Income Tax Rate Reconciliation, Percent [Abstract]
Statutory rate	21%
Foreign taxes, including withholding taxes	33.02%
Subpart F	2.20%
Other	1.10%
Effective income tax rate	15.32%

Derivative Instruments and He_3

Derivative Instruments and Hedging Strategies - Schedule of Fair Value of Derivative Assets and Liabilities (Details) - Designated as Hedging Instrument - Interest Rate Swap - Cash Flow Hedging - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Derivative [Line Items]
Derivative Assets	$ 0	$ 526
Derivative Liability	$ 0	$ 0

Derivative Instruments and He_4

Derivative Instruments and Hedging Strategies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Derivative [Line Items]
Derivative gains (loss) on cash flow hedges	$ 3	$ 365	$ 56	$ 1,521
Cash Flow Hedging
Derivative [Line Items]
Derivative gains (loss) on cash flow hedges			$ 500	$ 2,300

Derivative Instruments and He_5

Derivative Instruments and Hedging Strategies - Schedule of Gains (Losses) on Derivative Instruments not Designated as Hedging Instruments (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Embedded Derivative Financial Instruments
Derivative [Line Items]
Gains on derivative instruments	$ 0	$ 1	$ 0	$ 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	Sep. 30, 2023	Dec. 31, 2022
Fair Value, Inputs, Level 1
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Assets	$ 0	$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Receivables Net Current	Other Receivables Net Current
Fair Value, Inputs, Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Assets	$ 0	$ 526
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Receivables Net Current	Other Receivables Net Current
Fair Value, Inputs, Level 3
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Derivative Assets	$ 0	$ 0
Derivative Asset, Statement of Financial Position [Extensible Enumeration]	Other Receivables Net Current	Other Receivables Net Current

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Estimated Fair Values of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Reported Value Measurement
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	$ 58,636	$ 43,045
Long-term debt, including current portion	319,848	321,631
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 1
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	58,636	43,045
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]
Cash, cash equivalents and restricted cash	0	0
Long-term debt, including current portion	304,706	314,979
Estimate of Fair Value Measurement | Fair Value, Inputs, Level 3
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash, cash equivalents and restricted cash	0	0
Long-term debt, including current portion	$ 0	$ 0

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment charges					$ 2,900,000
Impairment of long-lived assets owned or leased in vessels			$ 0	$ 3,400,000
Fast Support Vessel
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment of long-lived assets held for sale		$ 900,000			900,000
Anchor Handling Towing Supply Vessel
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment of long-lived assets owned or leased in vessels	$ 1,200,000		$ 300,000		700,000
Tower and Gangway
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Impairment of long-lived assets held for sale	$ 1,300,000				$ 1,300,000

Warrants - Additional Informati

Warrants - Additional Information (Details) - $ / shares	Sep. 30, 2023	Dec. 31, 2022
Class of Warrant or Right [Line Items]
Class of warrant or right, exercise price of warrants or rights	$ 0.01
Class of Warrant or Right, Outstanding	1,321,968
Warrants Transactions
Class of Warrant or Right [Line Items]
Class of Warrant or Right, Number of Securities Called by Warrants or Rights		2,560,456
Class of warrant or right, exercise price of warrants or rights	$ 0.01

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) R$ in Thousands, $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($)	Sep. 30, 2023 BRL (R$)
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, total	$ 1
Unrecorded unconditional purchase obligation indefinitely deferred	$ 9.2
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	$ 4.5	R$ 22600
Maximum | Deficiency Notice
Commitments And Contingencies [Line Items]
Potential range of levies	$ 2.6	R$ 12870
FSV Offshore Support Vessels
Commitments And Contingencies [Line Items]
Unrecorded unconditional purchase obligation, maximum quantity	1	1

Stock Based Compensation - Sche

Stock Based Compensation - Schedule of Equity Incentive Plan Transactions (Details)	9 Months Ended
	Sep. 30, 2023 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding as of the beginning of year (in shares)	1,026,865
Granted (in shares)	0
Exercised (in shares)	(834)
Forfeited (in shares)	0
Outstanding as of the end of year (in shares)	1,026,031
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Outstanding as of the beginning of year (in shares)	1,682,193
Granted (in shares)	660,307
Vested (in shares)	(685,416)
Forfeited (in shares)	(15,000)
Outstanding as of the end of year (in shares)	1,642,084	[1]
[1] Excludes 156,620 grants of performance-based stock units that are not considered outstanding until such time that they become probable to vest.

Stock Based Compensation - Sc_2

Stock Based Compensation - Schedule of Equity Incentive Plan Transactions (Details) (Parenthetical)	Sep. 30, 2023 shares
Performance Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares outstanding	156,620

Stock Based Compensation - Addi

Stock Based Compensation - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
Treasury stock, shares acquired	232,239
Treasury stock, value acquired cost method	$ 2,368	$ 672

Segment Information - Schedule

Segment Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023		Sep. 30, 2022		Dec. 31, 2022
Segment Reporting Information [Line Items]
Operating Revenues	$ 75,574		$ 59,791		$ 202,438		$ 159,399
Direct Costs and Expenses	38,816		44,006		112,391		127,647
Direct Vessel Profit (Loss)	36,758		15,785		90,047		31,752
Lease expense	651		1,168		2,069		3,236
Administrative and general	12,300		9,978		37,636		30,112
Depreciation and amortization	13,462		13,754		40,799		42,333
Other Costs and Expenses	26,413		24,900		80,504		75,681
Gains on asset dispositions and impairments, net	(512)		(1,783)		3,352		381
Operating Income (Loss)	9,833		(10,898)		12,895		(43,548)
Historical cost	936,520		992,423		936,520		992,423		$ 967,683
Accumulated depreciation	(318,549)		(321,898)		(318,549)		(321,898)		(310,778)
Property and equipment	617,971		670,525		617,971		670,525		$ 656,905
Total Assets	725,541	[1]	763,144	[2]	725,541	[1]	763,144	[2]
Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	68,668		56,500		184,887		148,745
Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	368		332		1,092		998
Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	6,538		2,959		16,459		9,656
Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	19,943		20,152		59,690		56,933
Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	7,418		7,377		19,222		22,548
Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,768		5,046		4,037		16,493
Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,833		2,850		7,012		6,581
Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	5,047		5,416		13,504		13,495
Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,807		3,165		8,926		11,597
UNITED STATES
Segment Reporting Information [Line Items]
Operating Revenues	21,680		19,236		41,200		41,310
Direct Costs and Expenses	10,365		13,633		31,561		37,055
Direct Vessel Profit (Loss)	11,315		5,603		9,639		(4,255)
Lease expense	116		278		395		860
Depreciation and amortization	3,810		4,332		11,206		13,532
Historical cost	215,592		259,472		215,592		259,472
Accumulated depreciation	(96,597)		(122,340)		(96,597)		(122,340)
Property and equipment	118,995		137,132		118,995		137,132
Total Assets	155,613	[1]	177,463	[2]	155,613	[1]	177,463	[2]
UNITED STATES | Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	16,236		17,075		28,921		34,698
UNITED STATES | Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	0		0		0		0
UNITED STATES | Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	5,444		2,161		12,279		6,612
UNITED STATES | Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	6,712		7,243		19,204		17,939
UNITED STATES | Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,560		2,002		4,327		4,383
UNITED STATES | Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	462		1,549		2,011		8,506
UNITED STATES | Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	332		1,382		2,455		2,809
UNITED STATES | Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	958		1,143		2,665		2,599
UNITED STATES | Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	341		314		899		819
Africa and Europe, Continuing Operations
Segment Reporting Information [Line Items]
Operating Revenues	23,343		17,611		64,882		45,277
Direct Costs and Expenses	12,089		11,410		34,766		31,082
Direct Vessel Profit (Loss)	11,254		6,201		30,116		14,195
Lease expense	372		455		1,209		1,313
Depreciation and amortization	3,821		3,461		11,599		10,025
Historical cost	272,312		247,967		272,312		247,967
Accumulated depreciation	(89,338)		(80,069)		(89,338)		(80,069)
Property and equipment	182,974		167,898		182,974		167,898
Total Assets	212,048	[1]	187,495	[2]	212,048	[1]	187,495	[2]
Africa and Europe, Continuing Operations | Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	22,528		17,551		65,938		44,761
Africa and Europe, Continuing Operations | Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	0		0		0		0
Africa and Europe, Continuing Operations | Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	815		60		(1,056)		516
Africa and Europe, Continuing Operations | Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	5,089		4,694		14,427		11,756
Africa and Europe, Continuing Operations | Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,214		2,110		6,817		6,327
Africa and Europe, Continuing Operations | Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	320		383		1,648		1,661
Africa and Europe, Continuing Operations | Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	573		359		1,311		812
Africa and Europe, Continuing Operations | Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,573		2,284		6,207		5,247
Africa and Europe, Continuing Operations | Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,320		1,580		4,356		5,279
Middle East and Asia
Segment Reporting Information [Line Items]
Operating Revenues	16,190		12,031		51,996		40,106
Direct Costs and Expenses	11,069		13,339		26,326		39,073
Direct Vessel Profit (Loss)	5,121		1,308		25,670		1,033
Lease expense	59		35		202		104
Depreciation and amortization	3,721		3,974		11,117		12,548
Historical cost	285,721		305,880		285,721		305,880
Accumulated depreciation	(98,481)		(91,906)		(98,481)		(91,906)
Property and equipment	187,240		213,974		187,240		213,974
Total Assets	210,401	[1]	231,165	[2]	210,401	[1]	231,165	[2]
Middle East and Asia | Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	16,087		11,712		48,678		39,278
Middle East and Asia | Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	0		0		0		0
Middle East and Asia | Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	103		319		3,318		828
Middle East and Asia | Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	5,157		5,384		15,264		17,106
Middle East and Asia | Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,623		1,776		4,519		6,153
Middle East and Asia | Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,056		3,113		(723)		6,325
Middle East and Asia | Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	711		762		2,616		2,017
Middle East and Asia | Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	743		1,426		2,310		3,754
Middle East and Asia | Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	779		878		2,340		3,718
Latin America
Segment Reporting Information [Line Items]
Operating Revenues	14,361		10,913		44,360		32,706
Direct Costs and Expenses	5,293		5,624		19,738		20,437
Direct Vessel Profit (Loss)	9,068		5,289		24,622		12,269
Lease expense	104		400		263		959
Depreciation and amortization	2,110		1,987		6,877		6,228
Historical cost	162,895		179,104		162,895		179,104
Accumulated depreciation	(34,133)		(27,583)		(34,133)		(27,583)
Property and equipment	128,762		151,521		128,762		151,521
Total Assets	147,479	[1]	167,021	[2]	147,479	[1]	167,021	[2]
Latin America | Time Charter
Segment Reporting Information [Line Items]
Operating Revenues	13,817		10,162		41,350		30,008
Latin America | Bareboat Charter
Segment Reporting Information [Line Items]
Operating Revenues	368		332		1,092		998
Latin America | Other Marine Services
Segment Reporting Information [Line Items]
Operating Revenues	176		419		1,918		1,700
Latin America | Personnel
Segment Reporting Information [Line Items]
Direct Costs and Expenses	2,985		2,831		10,795		10,132
Latin America | Repairs and Maintenance
Segment Reporting Information [Line Items]
Direct Costs and Expenses	1,021		1,489		3,559		5,685
Latin America | Drydocking
Segment Reporting Information [Line Items]
Direct Costs and Expenses	(70)		1		1,101		1
Latin America | Insurance and Loss Reserves
Segment Reporting Information [Line Items]
Direct Costs and Expenses	217		347		630		943
Latin America | Fuel, Lubes and Supplies
Segment Reporting Information [Line Items]
Direct Costs and Expenses	773		563		2,322		1,895
Latin America | Other Direct Costs and Expenses
Segment Reporting Information [Line Items]
Direct Costs and Expenses	$ 367		$ 393		$ 1,331		$ 1,781
[1] Total assets by region does not include corporate assets of $ 54.8 million as of September 30, 2023 . Total assets by region does not include corporate assets of $ 79.8 million as of September 30, 2022 .

Segment Information - Schedul_2

Segment Information - Schedule of Segment Reporting Information, by Segment (Parenthetical) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022
Segment Reporting Information [Line Items]
Assets, Total	$ 780,327	$ 815,630
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Assets, Total	$ 54,800		$ 79,800

Segment Information - Additiona

Segment Information - Additional Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Segment Information [Line Items]
Equity method investments	$ 3,857		$ 3,024
Equity in Gains (Losses) Earnings of 50% or Less Owned Companies	$ 3,200	$ 5,800
Equity Investments in 50% or Less Owned Companies | Maximum
Segment Information [Line Items]
Equity method investment, ownership percentage	50%	50%
Other Offshore Marine Services Joint Ventures
Segment Information [Line Items]
Equity method investments	$ 68	$ 1,900	$ 76
Other Offshore Marine Services Joint Ventures | Maximum
Segment Information [Line Items]
Equity method investment, ownership percentage	50%	50%