Tidewater (TDW) 10-Q 12 Nov 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 04, 2019
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Entity Registrant Name	Tidewater Inc.
Entity Central Index Key	0000098222
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		39,231,039
Entity File Number	1-6311
Entity Tax Identification Number	72-0487776
Entity Address, Address Line One	6002 Rogerdale Road
Entity Address, Address Line Two	Suite 600
Entity Address, City or Town	Houston
Entity Address, State or Province	TX
Entity Address, Postal Zip Code	77072
City Area Code	713
Local Phone Number	470-5300
Entity Incorporation, State or Country Code	DE
Document Quarterly Report	true
Document Transition Report	false
Common Stock
Document Information [Line Items]
Trading Symbol	TDW
Security Exchange Name	NYSE
Title of 12(b) Security	Common stock, $0.001 par value per share
Series A Warrants
Document Information [Line Items]
Trading Symbol	TDW.WS.A
Security Exchange Name	NYSE
Title of 12(b) Security	Series A Warrants to purchase shares of common stock
Series B Warrants
Document Information [Line Items]
Trading Symbol	TDW.WS.B
Security Exchange Name	NYSE
Title of 12(b) Security	Series B Warrants to purchase shares of common stock
Warrants to Purchase common stock
Document Information [Line Items]
Trading Symbol	TDW.WS
Security Exchange Name	NYSEAMER
Title of 12(b) Security	Warrants to purchase shares of common stock

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 359,332	$ 371,791
Restricted cash	3,300	25,953
Trade and other receivables, net	123,133	111,266
Due from affiliates	124,757	132,951
Marine operating supplies	21,303	29,505
Other current assets	13,116	11,836
Total current assets	644,941	683,302
Investments in, at equity, and advances to unconsolidated companies	0	1,039
Properties and equipment, net	1,022,786	1,089,857
Deferred drydocking and survey costs	49,025	22,215
Other assets	37,269	31,326
Total assets	1,754,021	1,827,739
Current liabilities:
Accounts payable	23,672	31,939
Accrued costs and expenses	54,792	61,784
Due to affiliates	41,676	34,972
Current portion of long-term debt	9,689	8,568
Other current liabilities	30,024	21,092
Total current liabilities	159,853	158,355
Long-term debt	419,905	430,436
Other liabilities	96,499	94,025
Contingencies (Note 10)
Equity:
Common stock of $0.001 par value, 125,000,000 shares authorized, 39,110,938 and 36,978,280 shares issued and outstanding at September 30, 2019 and December 31, 2018, respectively	39	37
Additional paid-in capital	1,365,872	1,352,388
Accumulated deficit	(292,673)	(210,783)
Accumulated other comprehensive income	2,194	2,194
Total stockholders’ equity	1,075,432	1,143,836
Noncontrolling interests	2,332	1,087
Total equity	1,077,764	1,144,923
Total liabilities and equity	$ 1,754,021	$ 1,827,739

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	39,110,938	36,978,280
Common stock, shares outstanding	39,110,938	36,978,280

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Total revenues		$ 119,765	$ 99,192	$ 367,772	$ 296,286
Costs and expenses:
Vessel operating costs		80,619	65,237	243,261	194,613
Costs of other operating revenues		534	1,681	1,884	4,797
General and administrative		30,474	25,546	81,310	73,536
Depreciation and amortization		25,735	13,390	73,705	38,192
Loss (gain) on asset dispositions, net		(270)	1,571	(1,047)	(1,686)
Asset impairments	[1]	5,224	16,853	5,224	24,254
Total operating costs and expenses		142,316	124,278	404,337	333,706
Operating loss		(22,551)	(25,086)	(36,565)	(37,420)
Other income (expense):
Foreign exchange gain (loss)		173	1	(324)	(1,349)
Equity in net earnings (losses) of unconsolidated companies		(468)	56	(435)	(14,993)
Interest income and other, net		1,579	2,709	5,908	5,495
Interest and other debt costs, net		(7,468)	(7,585)	(22,786)	(22,731)
Total other expense		(6,184)	(4,819)	(17,637)	(33,578)
Loss before income taxes		(28,735)	(29,905)	(54,202)	(70,998)
Income tax expense		15,071	1,278	26,443	10,396
Net loss		(43,806)	(31,183)	(80,645)	(81,394)
Less: Net income attributable to noncontrolling interests		394	(287)	1,245	(386)
Net loss attributable to Tidewater Inc.		$ (44,200)	$ (30,896)	$ (81,890)	$ (81,008)
Basic loss per common share		$ (1.15)	$ (1.16)	$ (2.17)	$ (3.23)
Diluted loss per common share		$ (1.15)	$ (1.16)	$ (2.17)	$ (3.23)
Weighted average common shares outstanding		38,537	26,615	37,767	25,073
Adjusted weighted average common shares		38,537	26,615	37,767	25,073
Vessel Revenues
Revenues:
Total revenues		$ 117,173	$ 97,011	$ 360,476	$ 288,679
Other Operating Revenues
Revenues:
Total revenues		$ 2,592	$ 2,181	$ 7,296	$ 7,607
[1]	Refer to Note (14) for additional information regarding asset impairment charges.

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) $ in Thousands	9 Months Ended
	Sep. 30, 2018USD ($)
Statement Of Income And Comprehensive Income [Abstract]
Net loss	$ (81,394)
Other comprehensive income:
Unrealized losses on available for sale securities, net of tax of $0, $0, $0 and $0	(256)
Total comprehensive loss	$ (81,650)

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Unrealized losses on available-for-sale securities, tax	$ 0	$ 0	$ 0	$ 0

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018
Operating activities:
Net loss		$ (80,645)	$ (81,394)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization		57,629	33,949
Amortization of deferred drydocking and survey costs		16,076	4,243
Amortization of debt premium and discounts		(1,562)	(1,371)
Provision for deferred income taxes		759
Loss (gain) on asset dispositions, net		(1,047)	(1,686)
Asset impairments	[1]	5,224	24,254
Changes in investments in, at equity, and advances to unconsolidated companies		435	28,087
Compensation expense - stock-based		16,599	9,967
Changes in assets and liabilities, net:
Trade and other receivables		(11,796)	(10,744)
Changes in due to/from affiliate, net		14,898	28,290
Accounts payable		(8,267)	1,719
Accrued costs and expenses		(10,574)	(10,857)
Cash paid for deferred drydocking and survey costs		(43,701)	(17,088)
Other, net		9,268	14,861
Net cash provided by (used in) operating activities		(36,704)	22,230
Cash flows from investing activities:
Proceeds from sales of assets		25,092	16,499
Additions to properties and equipment		(13,931)	(9,116)
Net cash provided by investing activities		11,161	7,383
Cash flows from financing activities:
Principal payments on long-term debt		(6,458)	(4,020)
Payments to General Unsecured Creditors			(8,377)
Taxes on share based awards		(3,112)
Other		1	(1,997)
Net cash used in financing activities		(9,569)	(14,394)
Net change in cash, cash equivalents and restricted cash		(35,112)	15,219
Cash, cash equivalents and restricted cash at beginning of period		397,744	453,335
Cash, cash equivalents and restricted cash at end of period		362,632	468,554
Cash paid during the period for:
Interest, net of amounts capitalized		24,482	24,218
Income taxes		$ 10,386	$ 13,679
[1]	Refer to Note (14) for additional information regarding asset impairment charges.

CONDENSED CONSOLIDATED STATEM_5

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive loss	Non controlling interest
Balance at Dec. 31, 2017	$ 1,021,944	$ 22	$ 1,059,120	$ (39,266)	$ (147)	$ 2,215
Total comprehensive loss	(81,650)			(81,008)	(256)	(386)
Issuance of common stock	3	5	(2)
Amortization of restricted stock units	5,611		5,611
Acquisition of non-controlling interests	(2,000)		(1,126)			(874)
Balance at Sep. 30, 2018	943,908	27	1,063,603	(120,274)	(403)	955
Balance at Jun. 30, 2018	975,526	26	1,064,039	(89,378)	(403)	1,242
Total comprehensive loss	(31,183)			(30,896)		(287)
Issuance of common stock	1	1
Amortization of restricted stock units	(436)		(436)
Balance at Sep. 30, 2018	943,908	27	1,063,603	(120,274)	(403)	955
Balance at Dec. 31, 2018	1,144,923	37	1,352,388	(210,783)	2,194	1,087
Total comprehensive loss	(80,645)			(81,890)		1,245
Issuance of common stock from exercise of warrants	2	2
Amortization/cancellation of restricted stock units	13,484		13,484
Balance at Sep. 30, 2019	1,077,764	39	1,365,872	(292,673)	2,194	2,332
Balance at Jun. 30, 2019	1,115,539	38	1,359,842	(248,473)	2,194	1,938
Total comprehensive loss	(43,806)			(44,200)		394
Issuance of common stock from exercise of warrants		1	(1)
Amortization/cancellation of restricted stock units	6,031		6,031
Balance at Sep. 30, 2019	$ 1,077,764	$ 39	$ 1,365,872	$ (292,673)	$ 2,194	$ 2,332

INTERIM FINANCIAL STATEMENTS

INTERIM FINANCIAL STATEMENTS	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
INTERIM FINANCIAL STATEMENTS	(1) INTERIM FINANCIAL STATEMENTS The unaudited condensed consolidated financial statements for the interim periods presented herein have been prepared in conformity with United States generally accepted accounting principles and, in the opinion of management, include all adjustments (consisting only of normal recurring adjustments) necessary for a fair presentation of the unaudited condensed consolidated financial statements at the dates and for the periods indicated as required by Rule 10-01 of Regulation S‑X of the Securities and Exchange Commission (SEC). Results of operations for interim periods are not necessarily indicative of results of operations for the respective full years. These unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto in our Annual Report on Form 10-K for the year ended December 31, 2018, filed with the SEC on February 28, 2019. The unaudited condensed consolidated financial statements include the accounts of Tidewater Inc. and its subsidiaries. Intercompany balances and transactions are eliminated in consolidation. We use the equity method to account for equity investments over which we exercise significant influence but do not exercise control and are not the primary beneficiary. Unless otherwise specified, all per share information included in this document is on a diluted earnings per share basis. On November 15, 2018 (the Merger Date), we completed our business combination with GulfMark Offshore, Inc. (GulfMark) pursuant to the Agreement and Plan of the Merger dated July 15, 2018. GulfMark’s balances and results are included in our consolidated financial statements and disclosures beginning on the Merger Date. Therefore, our balances and results for the three and nine months ended September 30, 2019 include GulfMark’s operations while our balances and results for the three and nine months ended September 30, 2018 do not include GulfMark’s operations.

ACCOUNTING PRONOUNCEMENTS

ACCOUNTING PRONOUNCEMENTS	9 Months Ended
	Sep. 30, 2019
Accounting Changes And Error Corrections [Abstract]
ACCOUNTING PRONOUNCEMENTS	(2) ACCOUNTING PRONOUNCEMENTS We adopted Accounting Standards Update (ASU) No. 2016-02 - Leases (Topic 842), as amended, as of January 1, 2019. We adopted this guidance retrospectively at the beginning of the period of adoption through a cumulative-effect adjustment. We applied the practical expedient available in this guidance, which allows us not to restate prior year balances. Adoption of the new standard resulted in the recording of right of use assets and lease liabilities as of January 1, 2019 of approximately $5.0 million and $5.4 million, respectively. The adoption of the new standard did not result in an adjustment to retained earnings. The standard did not impact our consolidated net earnings and had no impact on cash flows. We elected not to reassess: (i) whether any expired or existing contracts contain leases; (ii) the lease classification for any expired or existing lease, and (iii) initial direct costs for existing leases. Refer to Note (4) for further details. As a lessor, our recognition of vessel and other operating revenues remains consistent with previous guidance under Accounting Standards Update 2014-09, Revenue from Contracts with Customers (ASC 606). In July 2018, the FASB issued guidance codified in Accounting Standards Update 2018-11, Leases – Targeted Improvements (ASU 2018-11). ASU 2018-11 provides a practical expedient, which allows lessors to combine the lease component with the related non-lease component if both the timing and pattern of transfer are the same for the lease and non-lease component and if the lease component would be classified as an operating lease. The single combined component is accounted for under the leasing standard if the lease component is the predominant component and, is accounted for under ASC 606 if the non-lease component is the predominant component. We elected this practical expedient to combine our lease and non-lease components for all classes of underlying assets and have accounted for the combined component under ASC 606 for revenue contracts qualifying for this practical expedient because we have concluded that the non-lease component is the predominant component in our current revenue contracts. The lease component is the vessels leased to our customers. The non-lease components consist of the services provided by the crews manning the vessels.

REVENUE RECOGNITION

REVENUE RECOGNITION	9 Months Ended
	Sep. 30, 2019
Revenue From Contract With Customer [Abstract]
REVENUE RECOGNITION	(3) REVENUE RECOGNITION Refer to Note (13) for the amount of revenue by segment and in total for the worldwide fleet. Contract Balances At September 30, 2019, we had $3.9 million and $0.5 million of deferred mobilization costs included within other current assets and other assets, respectively, and we had $0.4 million of deferred mobilization revenue related to unsatisfied performance obligations included within other current liabilities, of which $0.4 million will be recognized during the quarter ended December 31, 2019.

LEASES

LEASES	9 Months Ended
	Sep. 30, 2019
Lessee Disclosure [Abstract]
LEASES	(4) LEASES We have operating leases primarily for office space, temporary residences, automobiles and office equipment. Contracts containing assets that we benefit from and control are recognized on our balance sheet. Leases with an initial term of 12 months or less are not recorded on the balance sheet. We recognize lease expense for these leases on a straight-line basis over the lease term. We combine the lease and non-lease components for all of our lease agreements. Certain leases include one or more options to renew, with renewal terms that can extend the lease term from one to ten years. The exercise of lease renewal options is at our sole discretion, and lease renewal options are not included in our lease terms if they are not reasonably certain to be exercised. Our lease agreements do not contain any residual value guarantees or restrictive covenants or options to purchase the leased property. Leases (In thousands) Classification September 30, 2019 Assets: Operating Other assets $ 4,400 Liabilities: Current Operating Other current liabilities 698 Noncurrent Operating Other liabilities 4,135 Total lease liabilities $ 4,833 Maturity of lease liabilities (In thousands) Operating leases 2019 $ 496 2020 1,202 2021 1,165 2022 975 2023 729 After 2023 1,140 Total lease payments $ 5,707 Less: Interest 874 Present value of lease liabilities $ 4,833 As most of our leases do not provide an implicit interest rate, we use our incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. We used the incremental borrowing rate on January 1, 2019 for operating leases that began prior to that date. Three Months Ended Nine Months Ended Lease costs (In thousands) Classification September 30, 2019 September 30, 2018 Operating lease costs General and administrative $ 589 1,779 Short-term leases General and administrative 469 1,552 Variable lease costs General and administrative 407 1,011 Sublease income General and administrative — (3 ) Net lease cost $ 1,465 4,339 Our variable lease payments consist primarily of shared operating costs recognized over the term of the lease. Lease term and discount rate September 30, 2019 Weighted average remaining lease term in years 4.0 Weighted average discount rate 7.0 % The cash paid for operating leases included in operating cash flows and in the measurement of lease liabilities for the three and nine months ended September 30, 2019 was $0.3 million and $0.8 million, respectively. Right-of-use assets obtained in exchange for operating lease obligations were $0.0 million and $0.5 million, for the three and nine months ended September 30, 2019, respectively. Future minimum rental commitments as of December 31, 2018 are as follows: Minimum Year ending (In thousands) rental commitments 2019 $ 3,511 2020 2,804 2021 2,501 2022 2,455 2023 1,734 After 2023 2,495 Total lease payments $ 15,500

STOCKHOLDERS' EQUITY AND DILUTI

STOCKHOLDERS' EQUITY AND DILUTIVE EQUITY INSTRUMENTS	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
STOCKHOLDERS' EQUITY AND DILUTIVE EQUITY INSTRUMENTS	( 5 ) STOCKHOLDERS' EQUITY AND DILUTIVE EQUITY INSTRUMENTS Accumulated Other Comprehensive Income (Loss) The following table summarizes the reclassifications from accumulated other comprehensive income (loss) to the condensed consolidated statement of operations for the three and nine months ended September 30, 2019 and 2018: Three Months Ended Nine Months Ended Affected line item in the (In thousands) September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 consolidated statements of operations Balance at beginning of period $ 2,194 (403 ) 2,194 (147 ) Losses recognized in OCI (660 ) Realized gains on available for sale securities — — — 404 Interest income and other, net Net period OCI — — — (256 ) Tax effect — — — — Total gains for the period, net of tax — 0 — (256 ) Balance at end of period $ 2,194 (403 ) 2,194 (403 ) Dilutive Equity Instruments We had 3,397,110 and 5,143,206 incremental "in-the-money" warrants and restricted stock awards and units at September 30, 2019 and 2018, respectively. Common shares and creditor warrants and the sum of common shares and creditor warrants outstanding at September 30, 2019 and 2018 were as follows: Total shares outstanding including warrants September 30, 2019 September 30, 2018 Common shares outstanding 39,110,938 26,815,991 New Creditor Warrants (strike price $0.001 per common share) 1,329,884 3,512,416 GulfMark Creditor Warrants (strike price $0.01 per common share) 1,300,359 — Total 41,741,181 30,328,407 We also had 5,923,399 and 5,062,089 “out-of-the-money” warrants outstanding at September 30, 2019 and 2018, respectively. Included in these “out-of-the-money” warrants are Series A Warrants, Series B Warrants and GLF Equity Warrants which have exercise prices of $57.06, $62.28 and $100, respectively.

INCOME TAXES

INCOME TAXES	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
INCOME TAXES	(6 ) INCOME TAXES We use a discrete effective tax rate method to calculate taxes for interim periods instead of applying the annual effective tax rate to an estimate of the full fiscal year due to the level of volatility and unpredictability of earnings in our industry, both overall and by jurisdiction. Income tax expense for the three and nine months ended September 30, 2019, reflects tax liabilities in various jurisdictions that are either based on revenue (deemed profit regimes) or pre-tax profits. The tax liabilities for uncertain tax positions are primarily attributable to permanent establishment issues related to a foreign joint venture, subpart F income inclusions and withholding taxes on foreign services. Penalties and interest related to income tax liabilities are included in income tax expense. Income tax payable is included in other current liabilities. As of December 31, 2018, our balance sheet reflected approximately $104.9 million of net deferred tax assets with a valuation allowance of $106.4 million. As of September 30, 2019, we had net deferred tax assets of approximately $116.3 million prior to a valuation allowance analysis. Management assesses all available positive and negative evidence to estimate the company’s ability to generate sufficient future taxable income of the appropriate character, and in the appropriate taxing jurisdictions, to permit use of existing deferred tax assets. A significant piece of objective negative evidence is a cumulative loss incurred over a three-year period in a taxing jurisdiction. Prevailing accounting practice is that such objective evidence would limit the ability to consider other subjective evidence, such as projections for future growth. On the basis of this evaluation, a valuation allowance of $118.6 million has been recorded against net deferred tax assets which are more likely than not to be unrealized. The amount of deferred tax assets considered realizable could be adjusted if future estimates of U.S. taxable income change, or if objective negative evidence in the form of cumulative losses is no longer present and subjective evidence, such as financial projections for future growth and tax planning strategies, are given additional weight. With limited exceptions, we are no longer subject to tax audits by U.S. federal, state, local or foreign taxing authorities for years prior to 2013. We are subject to ongoing examinations by various foreign tax authorities and do not believe that the results of these examinations will have a material adverse effect on our financial position, results of operations, or cash flows.

AFFILIATES BALANCES

AFFILIATES BALANCES	9 Months Ended
	Sep. 30, 2019
Equity Method Investments And Joint Ventures [Abstract]
AFFILIATES BALANCES	(7) AFFILIATES BALANCES We maintained the following balances with our unconsolidated affiliates: (In thousands) September 30, 2019 December 31, 2018 Due from related parties: Sonatide (Angola) $ 91,801 109,176 DTDW (Nigeria) 32,956 23,775 Due to related parties: Sonatide (Angola) $ 27,141 29,347 DTDW (Nigeria) 14,535 5,625 Due from related parties, net of due to related parties $ 83,081 97,979 Amounts due from Sonatide Amounts due from Sonatide represent cash received by Sonatide from customers and due to us, amounts due from customers that are expected to be remitted to us by Sonatide and costs incurred by us on behalf of Sonatide. Nine Months Ended (In thousands) September 30, 2019 Due from Sonatide at December 31, 2018 $ 109,176 Revenue earned by the company through Sonatide 41,184 Less amounts received from Sonatide (45,393 ) Less amounts used to offset Due to Sonatide obligations (A) (10,551 ) Other (2,615 ) Total due from Sonatide at September 30, 2019 $ 91,801 ( A) We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture. The amounts due from Sonatide is denominated in U.S. dollars; however, the underlying third-party customer payments to Sonatide were satisfied, in part, in Angolan kwanzas. We and Sonangol, our partner in Sonatide, have had discussions regarding how the net losses from the devaluation of certain Angolan kwanza denominated accounts should be shared. After offsetting the amounts due to Sonatide, the net amount due from Sonatide at September 30, 2019 was approximately $64.7 million. Sonatide had approximately $52.2 million of cash on hand (approximately $14.4 million denominated in Angolan kwanzas) at September 30, 2019 plus approximately $18.4 million of net trade accounts receivable to satisfy the net due from Sonatide. Given prior discussions with our partner regarding how the net losses from the devaluation of certain Angolan kwanza denominated accounts should be shared, we continue to evaluate our net amount due from Sonatide balance for potential impairment based on available liquidity held by Sonatide. Amounts due to Sonatide Amounts due to Sonatide represent commissions payable and other costs paid by Sonatide on behalf of us. Nine Months Ended (In thousands) September 30, 2019 Due to Sonatide at December 31, 2018 $ 29,347 Plus additional commissions payable to Sonatide 3,914 Plus amounts paid by Sonatide on behalf of the company 7,342 Less commissions paid to Sonatide during the period (5,961 ) Less amounts used to offset Due from Sonatide obligations (A) (10,551 ) Other 3,050 Total due to Sonatide at September 30, 2019 $ 27,141 (A) We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture. Sonatide Operations Sonatide’s principal earnings are from the commissions paid by us to the joint venture for company vessels chartered in Angola. In addition, Sonatide owns three vessels (one of which is currently stacked) that may generate operating income and cash flow. Company operations in Angola Vessel revenues generated by our Angolan operations, percent of consolidated vessel revenues, average number of company owned vessels and average number of stacked company owned vessels of our Angolan operations for the periods indicated were as follows: Three Months Ended Nine Months Ended September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 Revenues of Angolan operations (in thousands) $ 11,534 15,154 41,194 43,874 Percent of consolidated vessel revenues 10 % 16 % 11 % 15 % Number of company owned vessels in Angola 31 36 33 38 Number of stacked company owned vessels in Angola 14 16 14 16

EMPLOYEE BENEFIT PLANS

EMPLOYEE BENEFIT PLANS	9 Months Ended
	Sep. 30, 2019
Compensation And Retirement Disclosure [Abstract]
EMPLOYEE BENEFIT PLANS	(8 ) EMPLOYEE BENEFIT PLANS U.S. Defined Benefit Pension Plan We have a defined benefit pension plan (pension plan) that covers certain U.S. citizen employees and other employees who are permanent residents of the United States. The Board of Directors amended the pension plan to discontinue the accrual of benefits once the plan was frozen on December 31, 2010. We Supplemental Executive Retirement Plan We also support a non-contributory and non-qualified defined benefit supplemental executive retirement plan (supplemental plan) that provided pension benefits to certain employees in excess of those allowed under our tax-qualified pension plan. Effective March 4, 2010, the supplemental plan was closed to new participants. We contributed $2.1 million and $2.9 million during the three and nine months ended September 30, 2019, respectively. We contributed immaterial amounts to the supplemental plan during the three and nine months ended September 30, 2018. We Other Defined Benefit Pension Plans We also have defined benefit pension plans that cover certain Norwegian citizen employees and other employees who are permanent residents of Norway. Benefits are based on years of service and employee compensation. We contributed an immaterial amount to the Norwegian defined benefit pension plans during the three and nine months ended September 30, 2019 and 2018 and contributions during the remainder of calendar year 2019 are expected to be immaterial. Net Periodic Benefit Costs The net periodic benefit cost for our defined benefit pension plans and supplemental plan (referred to collectively as “Pension Benefits”) is comprised of the following components: Three Months Ended Nine Months Ended (In thousands) September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 Pension Benefits: Service cost $ 316 47 328 118 Interest cost 1,006 872 2,853 2,656 Expected return on plan assets (711 ) (481 ) (1,787 ) (1,446 ) Administrative expenses 83 3 90 6 Settlement loss recognized (46 ) — 46 335 Net periodic pension cost $ 648 441 $ 1,530 1,669

DEBT

DEBT	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
DEBT	(9 ) DEBT The following is a summary of all debt outstanding: September 30, December 31, (In thousands) 2019 2018 Secured notes: 8.00% Senior secured notes due August 2022 (Secured Notes) (A) (B) $ 349,793 349,954 Troms Offshore borrowings (C): NOK denominated notes due May 2024 10,751 12,241 NOK denominated notes due January 2026 19,934 22,988 USD denominated notes due January 2027 20,273 22,116 USD denominated notes due April 2027 22,851 24,157 $ 423,602 431,456 Debt premiums and discounts, net 5,992 7,548 Less: Current portion of long-term debt (9,689 ) (8,568 ) Total long-term debt $ 419,905 430,436 (A) As of September 30, 2019 and December 31, 2018 the fair value (Level 2) of the Secured Notes was $357.9 million and $359.4 million, respectively. (B) I (C ) We pay principal and interest on these notes semi-annually. As of September 30, 2019 and December 31, 2018, the aggregate fair value (Level 2) of the Troms Offshore borrowings was $73.7 million and $81.5 million, respectively. The weighted average interest rate of the Troms Offshore borrowings as of September 30, 2019 was 5.0%. We may from time to time seek to retire or purchase our outstanding debt through cash purchases and/or exchanges for equity securities, in open market purchases, privately negotiated transactions, tender offers, exchange offers, redemptions, one or more additional offers , or otherwise. Such repurchases or exchanges, if any, will depend on prevailing market conditions, our liquidity requirements, contractual restrictions and other factors. The amounts involved may be material .

COMMITMENTS AND CONTINGENCIES

COMMITMENTS AND CONTINGENCIES	9 Months Ended
	Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
COMMITMENTS AND CONTINGENCIES	(10 ) COMMITMENTS AND CONTINGENCIES Currency Devaluation and Fluctuation Risk Due to our international operations, we are exposed to foreign currency exchange rate fluctuations and exchange rate risks on all charter hire contracts denominated in foreign currencies. For some of our international contracts, a portion of the revenue and local expenses are incurred in local currencies with the result that we are at risk for changes in the exchange rates between the U.S. dollar and foreign currencies. We generally do not hedge against any foreign currency rate fluctuations associated with foreign currency contracts that arise in the normal course of business, which exposes us to the risk of exchange rate losses. To minimize the financial impact of these items, we attempt to contract a significant majority of our services in U.S. dollars. In addition, we attempt to minimize the financial impact of these risks by matching the currency of our operating costs with the currency of our revenue streams when considered appropriate. We continually monitor the currency exchange risks associated with all contracts not denominated in U.S. dollars. Arbitral Award for the Taking of Our Venezuelan Operations Committees formed under the rules of the World Bank’s International Centre for Settlement of Investment Disputes (ICSID) have awarded two of our subsidiaries compensation for the expropriation of the investments of the two subsidiaries by the Bolivarian Republic of Venezuela. The nature of the investments expropriated and the progress of the ICSID proceeding were previously reported by us in prior filings. The final aggregate award is $59.9 million as of September 30, 2019 and accrues interest at approximately $0.6 million per quarter. The committees’ decisions are not subject to any further ICSID review, appeal or other substantive proceeding or any stay of enforcement. We are committed to taking appropriate steps to enforce and collect the award, which is enforceable in any of the 150 member states that are party to the ICSID Convention, but we recognize that collection of the award presents significant practical challenges. We will record any gain in future periods if and when the contingency is resolved. Legal Proceedings Various legal proceedings and claims are outstanding which arose in the ordinary course of business. In the opinion of management, the amount of ultimate liability, if any, with respect to these actions, will not have a material adverse effect on our financial position, results of operations, or cash flows.

FAIR VALUE MEASUREMENTS

FAIR VALUE MEASUREMENTS	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
FAIR VALUE MEASUREMENTS	(1 1 ) FAIR VALUE MEASUREMENTS Other Financial Instruments Our primary financial instruments consist of cash and cash equivalents, restricted cash, trade receivables and trade payables with book values that are considered to be representative of their respective fair values. We periodically utilize derivative financial instruments to hedge against foreign currency denominated assets and liabilities, currency commitments, or to lock in desired interest rates. These transactions are generally spot or forward currency contracts or interest rate swaps that are entered into with major financial institutions. Derivative financial instruments are intended to reduce our exposure to foreign currency exchange risk and interest rate risk. We enter into derivative instruments only to the extent considered necessary to address our risk management objectives and do not use derivative contracts for speculative purposes. The derivative instruments are recorded at fair value using quoted prices and quotes obtainable from the counterparties to the derivative instruments. Cash Equivalents . Our cash equivalents, which are securities with maturities less than 90 days, are held in money market funds, commercial paper or time deposit accounts with highly rated financial institutions. The carrying value for cash equivalents is considered to be representative of its fair value due to the short duration and conservative nature of the cash equivalent investment portfolio. Spot Derivatives . Spot derivative financial instruments are short-term in nature and generally settle within two business days. The fair value of spot derivatives approximates the carrying value due to the short-term nature of this instrument, and as a result, no gains or losses are recognized. We had no material spot derivatives outstanding as of September 30, 2019 or December 31, 2018.

OTHER CURRENT ASSETS, PROPERTIE

OTHER CURRENT ASSETS, PROPERTIES AND EQUIPMENT, OTHER ASSETS, ACCRUED EXPENSES, OTHER CURRENT LIABILITIES AND OTHER LIABILITIES	9 Months Ended
	Sep. 30, 2019
Other Current Assets Properties And Equipment Other Assets Accrued Expenses Other Current Liabilities And Other Non Current Liabilities And Deferred Credits [Abstract]
OTHER CURRENT ASSETS, PROPERTIES AND EQUIPMENT, OTHER ASSETS, ACCRUED EXPENSES, OTHER CURRENT LIABILITIES AND OTHER LIABILITIES	(1 2 ) OTHER CURRENT ASSETS, PROPERTIES AND EQUIPMENT, OTHER ASSETS, ACCRUED EXPENSES, OTHER CURRENT LIABILITIES AND OTHER LIABILITIES A summary of other current assets is as follows: September 30, December 31, (In thousands) 2019 2018 Deposits $ 1,267 1,413 Prepaid expenses and other 11,849 10,423 $ 13,116 11,836 A summary of properties and equipment is as follows: September 30, December 31, (In thousands) 2019 2018 Properties and equipment: Vessels and related equipment $ 1,132,307 1,144,028 Other properties and equipment 8,267 7,455 1,140,574 1,151,483 Less accumulated depreciation and amortization 117,788 61,626 Properties and equipment, net $ 1,022,786 1,089,857 Our property and equipment consist primarily of our 220 vessels located around the world. Subsequent to September 30, 2019, we sold two of our vessels, one in the Americas and one in West Africa, for a combined total of $3.6 million and will record a net gain on the asset sales in the fourth quarter of 2019. A summary of other assets is as follows: September 30, December 31, (In thousands) 2019 2018 Recoverable insurance losses $ 3,985 4,056 Investments held for supplemental savings plan accounts 5,002 4,807 Long-term deposits 17,870 16,848 Deferred tax asset 381 395 Right of use asset (A) 4,400 — Other 5,631 5,220 $ 37,269 31,326 (A) Refer to Note (4). A summary of accrued cost and expenses is as follows: September 30, December 31, (In thousands) 2019 2018 Payroll and related payables $ 18,589 17,447 Commissions payable (B) 1,877 1,990 Accrued vessel expenses 25,069 29,534 Accrued interest expense 5,596 5,985 Other accrued expenses 3,661 6,828 $ 54,792 61,784 (B) Excludes $25.9 million and $28.0 million of commissions due to Sonatide at September 30, 2019 and December 31, 2018, respectively. These amounts are included in amounts due to affiliate. A summary of other current liabilities is as follows: September 30, December 31, (In thousands) 2019 2018 Taxes payable $ 23,561 13,167 Lease liability - operating (C) 698 — Accrued property and liability losses 2,352 2,726 Other 3,413 5,199 $ 30,024 21,092 (C) Refer to Note (4). A summary of other liabilities is as follows: September 30, December 31, (In thousands) 2019 2018 Pension liabilities $ 29,884 33,124 Liability for uncertain tax positions 49,553 43,790 Deferred tax liability 2,658 1,913 Lease liability - operating (D) 4,135 — Accrued property and liability losses 1,107 4,123 Other 9,162 11,075 $ 96,499 94,025 (D) Refer to Note (4).

SEGMENT AND GEOGRAPHIC DISTRIBU

SEGMENT AND GEOGRAPHIC DISTRIBUTION OF OPERATIONS	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
SEGMENT AND GEOGRAPHIC DISTRIBUTION OF OPERATIONS	(1 3 ) SEGMENT AND GEOGRAPHIC DISTRIBUTION OF OPERATIONS The following table provides a comparison of segment revenues, vessel operating profit (loss), depreciation and amortization, and additions to properties and equipment for the three and nine months ended September 30, 2019 and 2018. Vessel revenues and operating costs relate to vessels owned and operated by us while other operating revenues relate to brokered vessels and other miscellaneous marine-related businesses. Three Months Ended Nine Months Ended (In thousands) September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 Revenues: Vessel revenues: Americas $ 33,147 28,039 103,624 86,721 Middle East/Asia Pacific 22,765 19,927 63,670 60,721 Europe/Mediterranean Sea 30,946 12,566 94,531 35,546 West Africa 30,315 36,479 98,651 105,691 Other operating revenues 2,592 2,181 7,296 7,607 $ 119,765 99,192 367,772 296,286 Vessel operating profit (loss) (A): Americas $ (168 ) 1,212 1,702 11,804 Middle East/Asia Pacific (809 ) (701 ) (4,098 ) (2,329 ) Europe/Mediterranean Sea (276 ) (2,056 ) (768 ) (6,753 ) West Africa 678 3,912 11,891 3,867 Other operating profit 2,052 485 5,381 2,767 1,477 2,852 14,108 9,356 Corporate expenses (A) (B) (19,074 ) (9,514 ) (46,496 ) (24,208 ) Gain (loss) on asset dispositions, net 270 (1,571 ) 1,047 1,686 Asset impairments (C) (5,224 ) (16,853 ) (5,224 ) (24,254 ) Operating loss $ (22,551 ) (25,086 ) (36,565 ) (37,420 ) Depreciation and amortization: Americas $ 6,929 3,858 19,706 10,700 Middle East/Asia Pacific 5,685 2,939 15,454 8,552 Europe/Mediterranean Sea 7,436 2,313 22,623 6,356 West Africa 5,335 4,176 14,876 12,269 Other 5 5 15 16 Corporate 345 99 1,031 299 $ 25,735 13,390 73,705 38,192 Additions to properties and equipment: Americas $ 326 564 967 2,831 Middle East/Asia Pacific 594 568 4,231 2,064 Europe/Mediterranean Sea 1,847 — 3,070 134 West Africa 684 54 2,267 35 Corporate 1,632 2,155 3,396 4,052 $ 5,083 3,341 13,931 9,116 (A) Prior to January 1, 2019, we allocated the costs of certain marine operations related to general and administrative functions, such as marine management, engineering, supply chain management, risk management, fleet human resources and health and safety to the segment general and administrative expenses. Beginning on January 1, 2019 our management elected to modify that process in order to better analyze costs and better align the policies of the two combined companies such that all costs related to those previously allocated functions will remain as corporate general and administrative expenses. This change explains the significant increase in corporate expenses that is reflected in the table above for the three and nine months ended September 30, 2019. (B) Included in corporate expenses for the nine months ended September 30, 2019 was a $5.0 million charge for integration costs related to the business combination with GulfMark. (C) Refer to Note (14) for additional information regarding asset impairment charges. The following table provides a comparison of total assets at September 30, 2019 and December 31, 2018: September 30, December 31, (In thousands) 2019 2018 Total assets: Americas $ 352,594 380,168 Middle East/Asia Pacific 268,754 233,611 Europe/Mediterranean Sea 382,094 316,524 West Africa 392,109 483,234 Other 4,238 7,440 Investments in, at equity, and advances to unconsolidated companies 0 1,039 Corporate 354,232 405,723 $ 1,754,021 $ 1,827,739

ASSET IMPAIRMENTS

ASSET IMPAIRMENTS	9 Months Ended
	Sep. 30, 2019
Asset Impairment Charges [Abstract]
ASSET IMPAIRMENTS	(1 4 ) ASSET IMPAIRMENTS The below table summarizes impairments during the three and nine months ended September 30, 2019 and 2018, along with the amount of impairment. Three Months Ended Nine Months Ended (Dollars in thousands) September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 Number of vessels impaired in the period — 15 — 30 Amount of impairment incurred $ 5,224 16,853 $ 5,224 24,254 As of September 30, 2019, we performed an evaluation to determine whether conditions existed that would indicate potential impairment in the value of our assets. Our evaluation did not indicate any indicators of impairment that would require us to perform additional analyses and, consequently, we have recorded no vessel impairment charges in the three and nine months ended September 30, 2019. We did evaluate our inventory as of September 30, 2019 and charged $5.2 million to impairment expense for obsolete marine service and vessel supplies and parts inventory. We considered this valuation approach to be a Level 3 fair value measurement due to the level of estimation involved in valuing obsolete inventory.

RESTRUCTURING CHARGES

RESTRUCTURING CHARGES	9 Months Ended
	Sep. 30, 2019
Restructuring And Related Activities [Abstract]
RESTRUCTURING CHARGES	( 1 5 ) RESTRUCTURING CHARGES In the fourth quarter of 2018, we finalized plans to abandon duplicate office facilities with lease terms expiring between 2023 and 2026 in St. Rose and New Orleans, Louisiana, Houston, Texas and Aberdeen, Scotland. These closures resulted in $7.3 million and $5.9 million, respectively, lease exit and severance charges in the fourth quarter of 2018 and the first three quarters of 2019. These charges are included in general and administrative expense in our consolidated statements of operations. Activity for the lease exit and severance liabilities for the nine months ended September 30, 2019 was as follows: Lease Exit Costs Severance (In thousands) Europe/ Mediterranean Corporate Europe/ Mediterranean Corporate Total Balance at December 31, 2018 $ 2,005 4,463 — 285 6,753 Charges 97 154 829 4,805 5,885 Cash payments (271 ) (1,689 ) (691 ) (3,529 ) (6,180 ) Balance at September 30, 2019 $ 1,831 2,928 138 1,561 6,458

LEASES (Tables)

LEASES (Tables)	9 Months Ended
	Sep. 30, 2019
Lessee Disclosure [Abstract]
Summary of Operating Lease Assets and Liabilities	Leases (In thousands) Classification September 30, 2019 Assets: Operating Other assets $ 4,400 Liabilities: Current Operating Other current liabilities 698 Noncurrent Operating Other liabilities 4,135 Total lease liabilities $ 4,833
Summary of Maturity of Operating Lease Liabilities	Maturity of lease liabilities (In thousands) Operating leases 2019 $ 496 2020 1,202 2021 1,165 2022 975 2023 729 After 2023 1,140 Total lease payments $ 5,707 Less: Interest 874 Present value of lease liabilities $ 4,833
Summary of Lease Costs	Three Months Ended Nine Months Ended Lease costs (In thousands) Classification September 30, 2019 September 30, 2018 Operating lease costs General and administrative $ 589 1,779 Short-term leases General and administrative 469 1,552 Variable lease costs General and administrative 407 1,011 Sublease income General and administrative — (3 ) Net lease cost $ 1,465 4,339
Summary of Lease Term and Discount Rate	Lease term and discount rate September 30, 2019 Weighted average remaining lease term in years 4.0 Weighted average discount rate 7.0 %
Summary Future Minimum Rental Commitments	Future minimum rental commitments as of December 31, 2018 are as follows: Minimum Year ending (In thousands) rental commitments 2019 $ 3,511 2020 2,804 2021 2,501 2022 2,455 2023 1,734 After 2023 2,495 Total lease payments $ 15,500

STOCKHOLDERS' EQUITY AND DILU_2

STOCKHOLDERS' EQUITY AND DILUTIVE EQUITY INSTRUMENTS (Tables)	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Operations	The following table summarizes the reclassifications from accumulated other comprehensive income (loss) to the condensed consolidated statement of operations for the three and nine months ended September 30, 2019 and 2018: Three Months Ended Nine Months Ended Affected line item in the (In thousands) September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 consolidated statements of operations Balance at beginning of period $ 2,194 (403 ) 2,194 (147 ) Losses recognized in OCI (660 ) Realized gains on available for sale securities — — — 404 Interest income and other, net Net period OCI — — — (256 ) Tax effect — — — — Total gains for the period, net of tax — 0 — (256 ) Balance at end of period $ 2,194 (403 ) 2,194 (403 )
Summary of Common Shares and Creditor Warrants and Sum of Common Shares and Creditor Warrants Outstanding	Common shares and creditor warrants and the sum of common shares and creditor warrants outstanding at September 30, 2019 and 2018 were as follows: Total shares outstanding including warrants September 30, 2019 September 30, 2018 Common shares outstanding 39,110,938 26,815,991 New Creditor Warrants (strike price $0.001 per common share) 1,329,884 3,512,416 GulfMark Creditor Warrants (strike price $0.01 per common share) 1,300,359 — Total 41,741,181 30,328,407

AFFILIATES BALANCES (Tables)

AFFILIATES BALANCES (Tables)	9 Months Ended
	Sep. 30, 2019
Equity Method Investments And Joint Ventures [Abstract]
Schedule of Balances with Unconsolidated Affiliates	We maintained the following balances with our unconsolidated affiliates: (In thousands) September 30, 2019 December 31, 2018 Due from related parties: Sonatide (Angola) $ 91,801 109,176 DTDW (Nigeria) 32,956 23,775 Due to related parties: Sonatide (Angola) $ 27,141 29,347 DTDW (Nigeria) 14,535 5,625 Due from related parties, net of due to related parties $ 83,081 97,979
Schedule of Amounts Due from Affiliate	Nine Months Ended (In thousands) September 30, 2019 Due from Sonatide at December 31, 2018 $ 109,176 Revenue earned by the company through Sonatide 41,184 Less amounts received from Sonatide (45,393 ) Less amounts used to offset Due to Sonatide obligations (A) (10,551 ) Other (2,615 ) Total due from Sonatide at September 30, 2019 $ 91,801 ( A) We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture.
Schedule of Amounts Due to Affiliate	Nine Months Ended (In thousands) September 30, 2019 Due to Sonatide at December 31, 2018 $ 29,347 Plus additional commissions payable to Sonatide 3,914 Plus amounts paid by Sonatide on behalf of the company 7,342 Less commissions paid to Sonatide during the period (5,961 ) Less amounts used to offset Due from Sonatide obligations (A) (10,551 ) Other 3,050 Total due to Sonatide at September 30, 2019 $ 27,141 (A) We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture.
Summary of Operations in Angola	Vessel revenues generated by our Angolan operations, percent of consolidated vessel revenues, average number of company owned vessels and average number of stacked company owned vessels of our Angolan operations for the periods indicated were as follows: Three Months Ended Nine Months Ended September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 Revenues of Angolan operations (in thousands) $ 11,534 15,154 41,194 43,874 Percent of consolidated vessel revenues 10 % 16 % 11 % 15 % Number of company owned vessels in Angola 31 36 33 38 Number of stacked company owned vessels in Angola 14 16 14 16

EMPLOYEE BENEFIT PLANS (Tables)

EMPLOYEE BENEFIT PLANS (Tables)	9 Months Ended
	Sep. 30, 2019
Compensation And Retirement Disclosure [Abstract]
Schedule of Net Periodic Benefit Costs	The net periodic benefit cost for our defined benefit pension plans and supplemental plan (referred to collectively as “Pension Benefits”) is comprised of the following components: Three Months Ended Nine Months Ended (In thousands) September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 Pension Benefits: Service cost $ 316 47 328 118 Interest cost 1,006 872 2,853 2,656 Expected return on plan assets (711 ) (481 ) (1,787 ) (1,446 ) Administrative expenses 83 3 90 6 Settlement loss recognized (46 ) — 46 335 Net periodic pension cost $ 648 441 $ 1,530 1,669

DEBT (Tables)

DEBT (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Summary of Debt Outstanding	The following is a summary of all debt outstanding: September 30, December 31, (In thousands) 2019 2018 Secured notes: 8.00% Senior secured notes due August 2022 (Secured Notes) (A) (B) $ 349,793 349,954 Troms Offshore borrowings (C): NOK denominated notes due May 2024 10,751 12,241 NOK denominated notes due January 2026 19,934 22,988 USD denominated notes due January 2027 20,273 22,116 USD denominated notes due April 2027 22,851 24,157 $ 423,602 431,456 Debt premiums and discounts, net 5,992 7,548 Less: Current portion of long-term debt (9,689 ) (8,568 ) Total long-term debt $ 419,905 430,436 (A) As of September 30, 2019 and December 31, 2018 the fair value (Level 2) of the Secured Notes was $357.9 million and $359.4 million, respectively. (B) I (C ) We pay principal and interest on these notes semi-annually. As of September 30, 2019 and December 31, 2018, the aggregate fair value (Level 2) of the Troms Offshore borrowings was $73.7 million and $81.5 million, respectively. The weighted average interest rate of the Troms Offshore borrowings as of September 30, 2019 was 5.0%.

OTHER CURRENT ASSETS, PROPERT_2

OTHER CURRENT ASSETS, PROPERTIES AND EQUIPMENT, OTHER ASSETS, ACCRUED EXPENSES, OTHER CURRENT LIABILITIES AND OTHER LIABILITIES (Tables)	9 Months Ended
	Sep. 30, 2019
Other Current Assets Properties And Equipment Other Assets Accrued Expenses Other Current Liabilities And Other Non Current Liabilities And Deferred Credits [Abstract]
Schedule of Other Current Assets	A summary of other current assets is as follows: September 30, December 31, (In thousands) 2019 2018 Deposits $ 1,267 1,413 Prepaid expenses and other 11,849 10,423 $ 13,116 11,836
Summary of Properties and Equipment	A summary of properties and equipment is as follows: September 30, December 31, (In thousands) 2019 2018 Properties and equipment: Vessels and related equipment $ 1,132,307 1,144,028 Other properties and equipment 8,267 7,455 1,140,574 1,151,483 Less accumulated depreciation and amortization 117,788 61,626 Properties and equipment, net $ 1,022,786 1,089,857
Schedule of Other Assets	A summary of other assets is as follows: September 30, December 31, (In thousands) 2019 2018 Recoverable insurance losses $ 3,985 4,056 Investments held for supplemental savings plan accounts 5,002 4,807 Long-term deposits 17,870 16,848 Deferred tax asset 381 395 Right of use asset (A) 4,400 — Other 5,631 5,220 $ 37,269 31,326 (A) Refer to Note (4).
Schedule of Accrued Cost and Expenses	A summary of accrued cost and expenses is as follows: September 30, December 31, (In thousands) 2019 2018 Payroll and related payables $ 18,589 17,447 Commissions payable (B) 1,877 1,990 Accrued vessel expenses 25,069 29,534 Accrued interest expense 5,596 5,985 Other accrued expenses 3,661 6,828 $ 54,792 61,784 (B) Excludes $25.9 million and $28.0 million of commissions due to Sonatide at September 30, 2019 and December 31, 2018, respectively. These amounts are included in amounts due to affiliate.
Schedule of Other Current Liabilities	A summary of other current liabilities is as follows: September 30, December 31, (In thousands) 2019 2018 Taxes payable $ 23,561 13,167 Lease liability - operating (C) 698 — Accrued property and liability losses 2,352 2,726 Other 3,413 5,199 $ 30,024 21,092 (C) Refer to Note (4).
Schedule of Other Liabilities and Deferred Credits	A summary of other liabilities is as follows: September 30, December 31, (In thousands) 2019 2018 Pension liabilities $ 29,884 33,124 Liability for uncertain tax positions 49,553 43,790 Deferred tax liability 2,658 1,913 Lease liability - operating (D) 4,135 — Accrued property and liability losses 1,107 4,123 Other 9,162 11,075 $ 96,499 94,025 (D) Refer to Note (4).

SEGMENT AND GEOGRAPHIC DISTRI_2

SEGMENT AND GEOGRAPHIC DISTRIBUTION OF OPERATIONS (Tables)	9 Months Ended
	Sep. 30, 2019
Segment Reporting [Abstract]
Segment Information, Geographical Data and Major Customers	The following table provides a comparison of segment revenues, vessel operating profit (loss), depreciation and amortization, and additions to properties and equipment for the three and nine months ended September 30, 2019 and 2018. Vessel revenues and operating costs relate to vessels owned and operated by us while other operating revenues relate to brokered vessels and other miscellaneous marine-related businesses. Three Months Ended Nine Months Ended (In thousands) September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 Revenues: Vessel revenues: Americas $ 33,147 28,039 103,624 86,721 Middle East/Asia Pacific 22,765 19,927 63,670 60,721 Europe/Mediterranean Sea 30,946 12,566 94,531 35,546 West Africa 30,315 36,479 98,651 105,691 Other operating revenues 2,592 2,181 7,296 7,607 $ 119,765 99,192 367,772 296,286 Vessel operating profit (loss) (A): Americas $ (168 ) 1,212 1,702 11,804 Middle East/Asia Pacific (809 ) (701 ) (4,098 ) (2,329 ) Europe/Mediterranean Sea (276 ) (2,056 ) (768 ) (6,753 ) West Africa 678 3,912 11,891 3,867 Other operating profit 2,052 485 5,381 2,767 1,477 2,852 14,108 9,356 Corporate expenses (A) (B) (19,074 ) (9,514 ) (46,496 ) (24,208 ) Gain (loss) on asset dispositions, net 270 (1,571 ) 1,047 1,686 Asset impairments (C) (5,224 ) (16,853 ) (5,224 ) (24,254 ) Operating loss $ (22,551 ) (25,086 ) (36,565 ) (37,420 ) Depreciation and amortization: Americas $ 6,929 3,858 19,706 10,700 Middle East/Asia Pacific 5,685 2,939 15,454 8,552 Europe/Mediterranean Sea 7,436 2,313 22,623 6,356 West Africa 5,335 4,176 14,876 12,269 Other 5 5 15 16 Corporate 345 99 1,031 299 $ 25,735 13,390 73,705 38,192 Additions to properties and equipment: Americas $ 326 564 967 2,831 Middle East/Asia Pacific 594 568 4,231 2,064 Europe/Mediterranean Sea 1,847 — 3,070 134 West Africa 684 54 2,267 35 Corporate 1,632 2,155 3,396 4,052 $ 5,083 3,341 13,931 9,116 (A) Prior to January 1, 2019, we allocated the costs of certain marine operations related to general and administrative functions, such as marine management, engineering, supply chain management, risk management, fleet human resources and health and safety to the segment general and administrative expenses. Beginning on January 1, 2019 our management elected to modify that process in order to better analyze costs and better align the policies of the two combined companies such that all costs related to those previously allocated functions will remain as corporate general and administrative expenses. This change explains the significant increase in corporate expenses that is reflected in the table above for the three and nine months ended September 30, 2019. (B) Included in corporate expenses for the nine months ended September 30, 2019 was a $5.0 million charge for integration costs related to the business combination with GulfMark. (C) Refer to Note (14) for additional information regarding asset impairment charges.
Comparison of Total Assets	The following table provides a comparison of total assets at September 30, 2019 and December 31, 2018: September 30, December 31, (In thousands) 2019 2018 Total assets: Americas $ 352,594 380,168 Middle East/Asia Pacific 268,754 233,611 Europe/Mediterranean Sea 382,094 316,524 West Africa 392,109 483,234 Other 4,238 7,440 Investments in, at equity, and advances to unconsolidated companies 0 1,039 Corporate 354,232 405,723 $ 1,754,021 $ 1,827,739

ASSET IMPAIRMENTS (Tables)

ASSET IMPAIRMENTS (Tables)	9 Months Ended
	Sep. 30, 2019
Asset Impairment Charges [Abstract]
Summary of Impairments	The below table summarizes impairments during the three and nine months ended September 30, 2019 and 2018, along with the amount of impairment. Three Months Ended Nine Months Ended (Dollars in thousands) September 30, 2019 September 30, 2018 September 30, 2019 September 30, 2018 Number of vessels impaired in the period — 15 — 30 Amount of impairment incurred $ 5,224 16,853 $ 5,224 24,254

RESTRUCTURING CHARGES (Tables)

RESTRUCTURING CHARGES (Tables)	9 Months Ended
	Sep. 30, 2019
Restructuring And Related Activities [Abstract]
Summary of Lease Exit and Severance Liabilities	Activity for the lease exit and severance liabilities for the nine months ended September 30, 2019 was as follows: Lease Exit Costs Severance (In thousands) Europe/ Mediterranean Corporate Europe/ Mediterranean Corporate Total Balance at December 31, 2018 $ 2,005 4,463 — 285 6,753 Charges 97 154 829 4,805 5,885 Cash payments (271 ) (1,689 ) (691 ) (3,529 ) (6,180 ) Balance at September 30, 2019 $ 1,831 2,928 138 1,561 6,458

Interim Financial Statements -

Interim Financial Statements - Additional Information (Detail) - GulfMark	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Interim Financial Statements [Line Items]
Business acquisition, name of acquired entity	GulfMark Offshore, Inc.	GulfMark Offshore, Inc.
Business acquisition, effective date of acquisition	Nov. 15, 2018	Nov. 15, 2018
Business acquisition, date of acquisition agreement	Jul. 15, 2018	Jul. 15, 2018

Accounting Pronouncements - Add

Accounting Pronouncements - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Right of use assets	$ 4,400
Lease liabilities	$ 4,833
Accounting Standards Update 2016-02
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Right of use assets		$ 5,000
Lease liabilities		$ 5,400

Revenue Recognition - Additiona

Revenue Recognition - Additional Information (Detail) - Vessel Mobilization - USD ($) $ in Millions	Dec. 31, 2019	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Deferred costs included within other current assets and other assets		$ 3.9
Other Assets
Disaggregation of Revenue [Line Items]
Deferred costs included within other current assets and other assets		$ 0.5
Unsatisfied Performance Obligations | Scenario, Forecast
Disaggregation of Revenue [Line Items]
Deferred mobilization revenue included within other current liabilities	$ 0.4

Leases - Additional Information

Leases - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2019USD ($)
Lessee Lease Description [Line Items]
Lessee, operating lease, existence of option to extend		true
Cash paid for operating leases	$ 0.3	$ 0.8
Right-of-use assets obtained in exchange for operating lease obligations	$ 0	$ 0.5
Minimum
Lessee Lease Description [Line Items]
Lessee, operating lease, renewal term	1 year	1 year
Maximum
Lessee Lease Description [Line Items]
Lessee, operating lease, renewal term	10 years	10 years

Summary of Operating Lease Asse

Summary of Operating Lease Assets and Liabilities (Detail) $ in Thousands	Sep. 30, 2019USD ($)
Assets And Liabilities Lessee [Abstract]
Operating lease assets	$ 4,400
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsMember
Operating lease liabilities, current	$ 698
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherCurrentLiabilitiesMember
Operating lease liabilities, noncurrent	$ 4,135
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	us-gaap:OtherNoncurrentLiabilitiesMember
Total lease liabilities	$ 4,833

Summary of Maturity of Operatin

Summary of Maturity of Operating Lease Liabilities (Detail) $ in Thousands	Sep. 30, 2019USD ($)
Operating Lease Liabilities Payments Due [Abstract]
2019	$ 496
2020	1,202
2021	1,165
2022	975
2023	729
After 2023	1,140
Total lease payments	5,707
Less: Interest	874
Present value of lease liabilities	$ 4,833

Summary of Lease Costs (Detail)

Summary of Lease Costs (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Lease Cost [Abstract]
Operating lease costs	$ 589	$ 1,779
Short-term leases	469	1,552
Variable lease costs	407	1,011
Sublease income		(3)
Net lease cost	$ 1,465	$ 4,339

Summary of Lease Term and Disco

Summary of Lease Term and Discount Rate (Detail)	Sep. 30, 2019
Leases [Abstract]
Weighted average remaining lease term in years	4 years
Weighted average discount rate	7.00%

Summary of Future Minimum Renta

Summary of Future Minimum Rental Commitments (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Lessee Minimum Rental Commitments Payments Due [Abstract]
2019	$ 3,511
2020	2,804
2021	2,501
2022	2,455
2023	1,734
After 2023	2,495
Total lease payments	$ 15,500

Reclassifications from Accumula

Reclassifications from Accumulated Other Comprehensive Income (Loss) to Condensed Consolidated Statement of Operations (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Balance	$ 1,115,539	$ 975,526	$ 1,144,923	$ 1,021,944
Interest income and other, net	1,579	2,709	5,908	5,495
Tax effect	15,071	1,278	26,443	10,396
Total gains for the period, net of tax	(44,200)	(30,896)	(81,890)	(81,008)
Balance	1,077,764	943,908	1,077,764	943,908
Reclassification out of Accumulated Other Comprehensive Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Balance	2,194	(403)	2,194	(147)
Losses recognized in OCI				(660)
Net period OCI				(256)
Total gains for the period, net of tax		0		(256)
Balance	$ 2,194	$ (403)	$ 2,194	(403)
Reclassification out of Accumulated Other Comprehensive Income | Realized Gains on Available for Sale Securities
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Interest income and other, net				$ 404

Stockholders' Equity and Dilu_3

Stockholders' Equity and Dilutive Equity Instruments - Additional Information (Detail) - $ / shares	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
In-the-money Warrants and Restricted Stock Awards and Units
Stockholders Equity Note [Line Items]
Incremental "in-the-money" warrants, and restricted stock awards and units	3,397,110	5,143,206
Out-of-the-money Warrants
Stockholders Equity Note [Line Items]
Warrants outstanding	5,923,399	5,062,089
Out-of-the-money Warrants | Series A Warrants
Stockholders Equity Note [Line Items]
Warrants exercise prices	$ 57.06	$ 57.06
Out-of-the-money Warrants | Series B Warrants
Stockholders Equity Note [Line Items]
Warrants exercise prices	62.28	62.28
Out-of-the-money Warrants | GLF Equity Warrants
Stockholders Equity Note [Line Items]
Warrants exercise prices	$ 100	$ 100

Stockholders' Equity and Dilu_4

Stockholders' Equity and Dilutive Equity Instruments - Summary of Common Shares and Creditor Warrants and Sum of Common Shares and Creditor Warrants Outstanding (Details) - shares	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Stockholders Equity Note [Line Items]
Common stock, shares outstanding	39,110,938	36,978,280	26,815,991
Total	41,741,181		30,328,407
New Creditor Warrants (Strike Price $0.001 Per Common Share)
Stockholders Equity Note [Line Items]
Creditor Warrants	1,329,884		3,512,416
GulfMark Creditor Warrants (Strike Price $0.01 Per Common Share)
Stockholders Equity Note [Line Items]
Creditor Warrants	1,300,359

Stockholders' Equity and Dilu_5

Stockholders' Equity and Dilutive Equity Instruments - Summary of Common Shares and Creditor Warrants and Sum of Common Shares and Creditor Warrants Outstanding (Parenthetical) (Details) - $ / shares	Sep. 30, 2019	Sep. 30, 2018
New Creditor Warrants (Strike Price $0.001 Per Common Share)
Stockholders Equity Note [Line Items]
Strike price per common share	$ 0.001	$ 0.001
GulfMark Creditor Warrants (Strike Price $0.01 Per Common Share)
Stockholders Equity Note [Line Items]
Strike price per common share	$ 0.01	$ 0.01

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Net deferred tax assets	$ 116.3	$ 104.9
Valuation allowance	$ 118.6	$ 106.4

Schedule of Balances with Uncon

Schedule of Balances with Unconsolidated Affiliates (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Due to related parties:
Due from related parties, net of due to related parties	$ 83,081	$ 97,979
Sonatide Marine, Ltd. | ANGOLA
Due from related parties:
Total due from related parties	91,801	109,176
Due to related parties:
Total due to related parties	27,141	29,347
DTDW Holdings, Ltd. | NIGERIA
Due from related parties:
Total due from related parties	32,956	23,775
Due to related parties:
Total due to related parties	$ 14,535	$ 5,625

Schedule of Amounts Due from Af

Schedule of Amounts Due from Affiliate (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Schedule Of Equity Method Investments [Line Items]
Begining balance	$ 132,951
Ending balance	124,757
Sonatide Marine, Ltd.
Schedule Of Equity Method Investments [Line Items]
Begining balance	109,176
Revenue earned by the company through Sonatide	41,184
Less amounts received from Sonatide	(45,393)
Less amounts used to offset Due to Sonatide obligations	(10,551)	[1]
Other	(2,615)
Ending balance	$ 91,801
[1]	We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture.

Affiliates Balances - Additiona

Affiliates Balances - Additional Information (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019USD ($)Vessel
Schedule Of Equity Method Investments [Line Items]
Number of vessels operating | Vessel	220
Sonatide Marine, Ltd.
Schedule Of Equity Method Investments [Line Items]
Due from affiliate current net after offsetting due to affiliate	$ 64.7
Cash	$ 52.2
Number of vessels operating | Vessel	3
Number of vessels stacked | Vessel	1
Sonatide Marine, Ltd. | Angola, Kwanza
Schedule Of Equity Method Investments [Line Items]
Cash	$ 14.4
Sonatide Marine, Ltd. | Trade Accounts Receivable
Schedule Of Equity Method Investments [Line Items]
Net trade accounts receivable	$ 18.4

Schedule of Amounts Due to Affi

Schedule of Amounts Due to Affiliate (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Schedule Of Equity Method Investments [Line Items]
Begining balance	$ 34,972
Ending balance	41,676
Sonatide Marine, Ltd.
Schedule Of Equity Method Investments [Line Items]
Begining balance	29,347
Plus additional commissions payable to Sonatide	3,914
Plus amounts paid by Sonatide on behalf of the company	7,342
Less commissions paid to Sonatide during the period	(5,961)
Less amounts used to offset Due from Sonatide obligations	(10,551)	[1]
Other	3,050
Ending balance	$ 27,141
[1]	We reduced the respective due from affiliates and due to affiliates balances each period through netting transactions based on agreement with the joint venture.

Summary of Operations in Angola

Summary of Operations in Angola (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019USD ($)Vessel	Sep. 30, 2018USD ($)Vessel	Sep. 30, 2019USD ($)Vessel	Sep. 30, 2018USD ($)Vessel
Schedule Of Equity Method Investments [Line Items]
Revenues of Angolan operations (in thousands) | $	$ 119,765	$ 99,192	$ 367,772	$ 296,286
Number of company owned vessels in Angola			220
ANGOLA
Schedule Of Equity Method Investments [Line Items]
Revenues of Angolan operations (in thousands) | $	$ 11,534	$ 15,154	$ 41,194	$ 43,874
Percent of consolidated vessel revenues	10.00%	16.00%	11.00%	15.00%
Number of company owned vessels in Angola	31	36	33	38
Number of stacked company owned vessels in Angola	14	16	14	16

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Pension Plans, Defined Benefit
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, employer contributions			$ 1.1
Supplemental Executive Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, employer contributions		$ 2.1	2.9
Obligations under the supplemental plan		$ 19.3	$ 19.3	$ 21.4
Supplemental Executive Retirement Plan | Scenario, Forecast
Defined Benefit Plan Disclosure [Line Items]
Defined benefit plan, employer contributions	$ 0.4

Schedule of Net Periodic Benefi

Schedule of Net Periodic Benefit Costs (Detail) - Pension Benefits - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Period Benefit Cost Assumptions [Line Items]
Service cost	$ 316	$ 47	$ 328	$ 118
Interest cost	1,006	872	2,853	2,656
Expected return on plan assets	(711)	(481)	(1,787)	(1,446)
Administrative expenses	83	3	90	6
Settlement loss recognized	(46)		46	335
Net periodic pension cost	$ 648	$ 441	$ 1,530	$ 1,669

Summary of Debt Outstanding (De

Summary of Debt Outstanding (Detail) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Debt [Line Items]
Amount outstanding	[1]	$ 423,602	$ 431,456
Debt premiums and discounts, net		5,992	7,548
Less: Current portion of long-term debt		(9,689)	(8,568)
Total long-term debt		419,905	430,436
8.00% Senior Secured Notes Due August 2022
Debt [Line Items]
Secured notes	[2],[3]	349,793	349,954
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS
Debt [Line Items]
Amount outstanding	[1]	10,751	12,241
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS
Debt [Line Items]
Amount outstanding	[1]	19,934	22,988
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS
Debt [Line Items]
Amount outstanding	[1]	20,273	22,116
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS
Debt [Line Items]
Amount outstanding	[1]	$ 22,851	$ 24,157
[1]	We pay principal and interest on these notes semi-annually.  As of September 30, 2019 and December 31, 2018, the aggregate fair value (Level 2) of the Troms Offshore borrowings was $73.7 million and $81.5  million, respectively. The weighted average interest rate of the Troms Offshore borrowings as of September 30, 2019 was 5.0%.
[2]	I
[3]	As of September 30, 2019 and December 31, 2018 the fair value (Level 2) of the Secured Notes was $357.9 million and $359.4 million, respectively.

Summary of Debt Outstanding (Pa

Summary of Debt Outstanding (Parenthetical) (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018	Jul. 31, 2019	Jan. 31, 2019
Debt [Line Items]
Restricted cash	$ 3,300,000	$ 25,953,000
Troms Offshore Supply AS
Debt [Line Items]
Description of frequency of periodic payments on notes	semi-annually
Weighted average interest rate of debt borrowings	5.00%
Troms Offshore Supply AS | Level 2
Debt [Line Items]
Fair value of debt outstanding	$ 73,700,000	$ 81,500,000
8.00% Senior Secured Notes Due August 2022
Debt [Line Items]
Debt instrument interest rate	8.00%	8.00%
Debt Instrument Maturity Period	August 2022	August 2022
8.00% Senior Secured Notes Due August 2022 | Level 2
Debt [Line Items]
Fair value of debt outstanding	$ 357,900,000	$ 359,400,000
Norwegian Kroner Denominated Notes Due May 2024 | Troms Offshore Supply AS
Debt [Line Items]
Debt Instrument Maturity Period	May 2024	May 2024
Norwegian Kroner Denominated Notes Due January 2026 | Troms Offshore Supply AS
Debt [Line Items]
Debt Instrument Maturity Period	January 2026	January 2026
United States Dollar Denominated Notes Due January 2027 | Troms Offshore Supply AS
Debt [Line Items]
Debt Instrument Maturity Period	January 2027	January 2027
United States Dollar Denominated Notes Due April 2027 | Troms Offshore Supply AS
Debt [Line Items]
Debt Instrument Maturity Period	April 2027	April 2027
Tendered Notes
Debt [Line Items]
Aggregate principal amount			$ 747	$ 160,000

Commitment and Contingencies (A

Commitment and Contingencies (Arbitral Award for the Taking of the Company's Venezuelan Operations) - Additional Information (Detail) - Compensatory Purposes - VENEZUELA $ in Millions	9 Months Ended
	Sep. 30, 2019USD ($)Subsidiary
Commitments and Contingencies Disclosure [Line Items]
Number of subsidiaries awarded grant | Subsidiary	2
Compensation awarded to the claimants	$ 59.9
Litigation settlement accrual interest	$ 0.6

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Cash equivalents maturity period, days	90 days
Spot derivatives outstanding	$ 0	$ 0

Schedule of Other Current Asset

Schedule of Other Current Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Other Current Assets, Properties and Equipment, Other Assets Accrued Expenses Other Current Liabilities and other Non current liabilities and Deferred Credits [Abstract]
Deposits	$ 1,267	$ 1,413
Prepaid expenses and other	11,849	10,423
Total other current assets	$ 13,116	$ 11,836

Summary of Properties and Equip

Summary of Properties and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Abstract]
Vessels and related equipment	$ 1,132,307	$ 1,144,028
Other properties and equipment	8,267	7,455
Properties and equipment, gross	1,140,574	1,151,483
Less accumulated depreciation and amortization	117,788	61,626
Properties and equipment, net	$ 1,022,786	$ 1,089,857

Other Current Assets, Propert_3

Other Current Assets, Properties and Equipment, Other Assets, Accrued Expenses, Other Current Liabilities and Other Liabilities - Additional Information (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Dec. 31, 2019USD ($)Vessel	Sep. 30, 2019USD ($)Vessel	Sep. 30, 2018USD ($)
Property Plant And Equipment [Line Items]
Number of vessels		220
Proceeds from sales of assets | $		$ 25,092	$ 16,499
Scenario, Forecast
Property Plant And Equipment [Line Items]
Number of vessels sold	2
Proceeds from sales of assets | $	$ 3,600
Americas | Scenario, Forecast
Property Plant And Equipment [Line Items]
Number of vessels sold	1
West Africa | Scenario, Forecast
Property Plant And Equipment [Line Items]
Number of vessels sold	1

Schedule of Other Assets (Detai

Schedule of Other Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Other Assets, Noncurrent [Abstract]
Recoverable insurance losses	$ 3,985	$ 4,056
Investments held for supplemental savings plan accounts	5,002	4,807
Long-term deposits	17,870	16,848
Deferred tax asset	381	395
Right of use asset	4,400
Other	5,631	5,220
Total other assets	$ 37,269	$ 31,326

Schedule of Accrued Cost and Ex

Schedule of Accrued Cost and Expenses (Detail) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Accounts Payable and Accrued Liabilities Current [Abstract]
Payroll and related payables		$ 18,589	$ 17,447
Commissions payable	[1]	1,877	1,990
Accrued vessel expenses		25,069	29,534
Accrued interest expense		5,596	5,985
Other accrued expenses		3,661	6,828
Accrued cost and expenses		$ 54,792	$ 61,784
[1]	Excludes $25.9 million and $28.0 million of commissions due to Sonatide at September 30, 2019 and December 31, 2018, respectively. These amounts are included in amounts due to affiliate.

Schedule of Accrued Cost and _2

Schedule of Accrued Cost and Expenses (Parenthetical) (Detail) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Schedule Of Accrued Liabilities [Line Items]
Commissions payable	[1]	$ 1,877	$ 1,990
Sonatide joint venture
Schedule Of Accrued Liabilities [Line Items]
Commissions payable		$ 25,900	$ 28,000
[1]	Excludes $25.9 million and $28.0 million of commissions due to Sonatide at September 30, 2019 and December 31, 2018, respectively. These amounts are included in amounts due to affiliate.

Schedule of Other Current Liabi

Schedule of Other Current Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Other Liabilities Current [Abstract]
Taxes payable	$ 23,561	$ 13,167
Lease liability - operating	698
Accrued property and liability losses	2,352	2,726
Other	3,413	5,199
Other current liabilities	$ 30,024	$ 21,092

Schedule of Other Liabilities a

Schedule of Other Liabilities and Deferred Credits (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Deferred Credits and Other Liabilities [Abstract]
Pension liabilities	$ 29,884	$ 33,124
Liability for uncertain tax positions	49,553	43,790
Deferred tax liability	2,658	1,913
Lease liability - operating	4,135
Accrued property and liability losses	1,107	4,123
Other	9,162	11,075
Other liabilities and deferred credits	$ 96,499	$ 94,025

Segment Information, Geographic

Segment Information, Geographical Data and Major Customers (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total revenues		$ 119,765	$ 99,192	$ 367,772	$ 296,286
Operating profit (loss)	[1]	1,477	2,852	14,108	9,356
Corporate expenses	[1],[2]	(19,074)	(9,514)	(46,496)	(24,208)
Gain (loss) on asset dispositions, net		270	(1,571)	1,047	1,686
Asset impairments	[3]	(5,224)	(16,853)	(5,224)	(24,254)
Operating loss		(22,551)	(25,086)	(36,565)	(37,420)
Depreciation and amortization		25,735	13,390	73,705	38,192
Additions to properties and equipment		5,083	3,341	13,931	9,116
All Other Segments
Segment Reporting Information [Line Items]
Operating profit (loss)	[1]	2,052	485	5,381	2,767
Depreciation and amortization		5	5	15	16
Operating Segments | Americas
Segment Reporting Information [Line Items]
Operating profit (loss)	[1]	(168)	1,212	1,702	11,804
Depreciation and amortization		6,929	3,858	19,706	10,700
Additions to properties and equipment		326	564	967	2,831
Operating Segments | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Operating profit (loss)	[1]	(809)	(701)	(4,098)	(2,329)
Depreciation and amortization		5,685	2,939	15,454	8,552
Additions to properties and equipment		594	568	4,231	2,064
Operating Segments | Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Operating profit (loss)	[1]	(276)	(2,056)	(768)	(6,753)
Depreciation and amortization		7,436	2,313	22,623	6,356
Additions to properties and equipment		1,847		3,070	134
Operating Segments | West Africa Segment
Segment Reporting Information [Line Items]
Operating profit (loss)	[1]	678	3,912	11,891	3,867
Depreciation and amortization		5,335	4,176	14,876	12,269
Additions to properties and equipment		684	54	2,267	35
Corporate
Segment Reporting Information [Line Items]
Depreciation and amortization		345	99	1,031	299
Additions to properties and equipment		1,632	2,155	3,396	4,052
Service | Operating Segments | Americas
Segment Reporting Information [Line Items]
Total revenues		33,147	28,039	103,624	86,721
Service | Operating Segments | Middle East/Asia Pacific
Segment Reporting Information [Line Items]
Total revenues		22,765	19,927	63,670	60,721
Service | Operating Segments | Europe/Mediterranean Sea
Segment Reporting Information [Line Items]
Total revenues		30,946	12,566	94,531	35,546
Service | Operating Segments | West Africa Segment
Segment Reporting Information [Line Items]
Total revenues		30,315	36,479	98,651	105,691
Other Operating Revenues
Segment Reporting Information [Line Items]
Total revenues		$ 2,592	$ 2,181	$ 7,296	$ 7,607
[1]	Prior to January 1, 2019, we allocated the costs of certain marine operations related to general and administrative functions, such as marine management, engineering, supply chain management, risk management, fleet human resources and health and safety to the segment general and administrative expenses. Beginning on January 1, 2019 our management elected to modify that process in order to better analyze costs and better align the policies of the two combined companies such that all costs related to those previously allocated functions will remain as corporate general and administrative expenses. This change explains the significant increase in corporate expenses that is reflected in the table above for the three and nine months ended September 30, 2019.
[2]	Included in corporate expenses for the nine months ended September 30, 2019 was a $5.0 million charge for integration costs related to the business combination with GulfMark.
[3]	Refer to Note (14) for additional information regarding asset impairment charges.

Segment Information, Geograph_2

Segment Information, Geographical Data and Major Customers (Parenthetical) (Detail) $ in Millions	9 Months Ended
	Sep. 30, 2019USD ($)
Corporate | GulfMark
Segment Reporting Information [Line Items]
Merger and integration costs	$ 5

Comparison of Total Assets (Det

Comparison of Total Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Segment and Geographic Distribution of Operations [Line Items]
Assets	$ 1,754,021	$ 1,827,739
Investments in, at equity, and advances to unconsolidated companies	0	1,039
All Other Segments
Segment and Geographic Distribution of Operations [Line Items]
Assets	4,238	7,440
Operating Segments | Americas
Segment and Geographic Distribution of Operations [Line Items]
Assets	352,594	380,168
Operating Segments | Middle East/Asia Pacific
Segment and Geographic Distribution of Operations [Line Items]
Assets	268,754	233,611
Operating Segments | Europe/Mediterranean Sea
Segment and Geographic Distribution of Operations [Line Items]
Assets	382,094	316,524
Operating Segments | West Africa
Segment and Geographic Distribution of Operations [Line Items]
Assets	392,109	483,234
Corporate
Segment and Geographic Distribution of Operations [Line Items]
Assets	$ 354,232	$ 405,723

Summary of Impairments (Detail)

Summary of Impairments (Detail) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)Vessel	Sep. 30, 2019USD ($)	Sep. 30, 2018USD ($)Vessel
Asset Impairment Charges [Abstract]
Number of vessels impaired in the period | Vessel			15		30
Amount of impairment incurred | $	[1]	$ 5,224	$ 16,853	$ 5,224	$ 24,254
[1]	Refer to Note (14) for additional information regarding asset impairment charges.

Asset Impairments - Additional

Asset Impairments - Additional Information (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Asset Impairment Charges [Abstract]
Impairments charges		$ 0		$ 0
Asset impairments	[1]	$ 5,224	$ 16,853	$ 5,224	$ 24,254
[1]	Refer to Note (14) for additional information regarding asset impairment charges.

Restructuring Charges - Additio

Restructuring Charges - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Dec. 31, 2018	Sep. 30, 2019
Restructuring And Related Activities [Abstract]
Lease term expiration		lease terms expiring between 2023 and 2026
Lease exit and severance charges	$ 7.3	$ 5.9

Summary of Lease Exit and Sever

Summary of Lease Exit and Severance Liabilities (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Restructuring Cost And Reserve [Line Items]
Beginning balance	$ 6,753
Charges	5,885
Cash payments	(6,180)
Ending balance	6,458
Lease Exit Costs | Europe/Mediterranean Sea
Restructuring Cost And Reserve [Line Items]
Beginning balance	2,005
Charges	97
Cash payments	(271)
Ending balance	1,831
Lease Exit Costs | Corporate
Restructuring Cost And Reserve [Line Items]
Beginning balance	4,463
Charges	154
Cash payments	(1,689)
Ending balance	2,928
Severance | Europe/Mediterranean Sea
Restructuring Cost And Reserve [Line Items]
Charges	829
Cash payments	(691)
Ending balance	138
Severance | Corporate
Restructuring Cost And Reserve [Line Items]
Beginning balance	285
Charges	4,805
Cash payments	(3,529)
Ending balance	$ 1,561