XML 164 R144.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Segment Information, Geographical Data and Major Customers (Detail) - USD ($) $ in Thousands | 1 Months Ended | 2 Months Ended | 3 Months Ended | 4 Months Ended | 5 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Jul. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 171,884 |  |  |  |
Other operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,869 |  |  |  |
Total revenues |  |  |  | $ 74,300 |  | $ 104,453 |  |  |  |  |  |  |  |  |  |  |  |  |  | 178,753 |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,277 |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (46,619) |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 20,337 |  |  |  |
Corporate expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14,989) |  |  |  |
Gain on asset dispositions, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,616 |  |  |  |
Asset impairments |  |  |  |  |  | (16,777) |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,777) | [1] |  |  |
Operating loss |  |  |  | $ (5,782) | [2] | (18,091) | [2] |  |  |  |  |  |  |  |  |  |  |  |  | (23,873) |  |  |  |
Foreign exchange loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (407) |  |  |  |
Equity in net earnings of unconsolidated companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,130 |  |  |  |
Interest income and other, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,771 |  |  |  |
Reorganization items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (4,299) |  |  |  |
Interest and other debt costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (13,009) |  |  |  |
Loss before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (36,687) |  |  |  |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,834 |  |  |  |
Assets |  |  |  |  |  | 1,746,180 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,746,180 |  |  |  |
Assets excluding equity investments |  |  |  |  |  | 1,251,125 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,251,125 |  |  |  |
Investments in, at equity, and advances to unconsolidated companies |  |  |  |  |  | 29,216 |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,216 |  |  |  |
Assets except corporate portion |  |  |  |  |  | 1,280,341 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,280,341 |  |  |  |
All Other Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,614 |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 827 |  |  |  |
Assets |  |  |  |  |  | 2,443 |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,443 |  |  |  |
Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 146,597 |  |  |  |  | $ 583,816 |
Other operating revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,772 |  |  |  |  | 17,795 |
Total revenues |  | $ 36,263 |  |  |  |  |  | $ 115,106 |  | $ 160,749 | [3] | $ 129,215 | [3] | $ 143,722 | [3] | $ 167,925 | [3] | 151,369 |  |  |  | $ 440,862 | 601,611 |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (44,615) |  |  |  |  | (59,380) |
General and administrative expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (41,832) |  |  |  |  | (145,879) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 47,447 |  |  |  |  | 167,291 |
Corporate expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (18,246) |  |  |  |  | (57,845) |
Gain on asset dispositions, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,561 |  |  |  |  | 24,099 |
Asset impairments |  | (21,325) |  |  |  |  |  | (163,423) |  | (64,857) |  | (253,422) |  | (129,562) |  | (36,886) |  | (184,748) | [1] |  |  |  | (484,727) | [1]
Operating loss |  | (38,674) | [2] |  |  |  |  | $ (205,374) | [2] | (69,340) | [2] | $ (287,034) | [2] | $ (155,344) | [2] | $ (66,135) | [2] | (244,048) |  |  |  | (508,513) | (577,853) |
Foreign exchange loss |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,181) |  |  |  |  | (1,638) |
Equity in net earnings of unconsolidated companies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,786 |  |  |  |  | 5,710 |
Interest income and other, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,384 |  |  |  |  | 5,193 |
Reorganization items |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,396,905) |  |  |  |  |  |
Interest and other debt costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (11,179) |  |  |  |  | (75,026) |
Loss before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,648,143) |  |  |  | $ (558,359) | (643,614) |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,265 |  |  |  |  | 30,547 |
Assets |  | 3,884,669 |  |  |  |  |  |  |  | 4,190,699 |  |  |  |  |  |  |  | 3,884,669 |  |  |  |  | 4,190,699 |
Assets excluding equity investments |  | 3,035,550 |  |  |  |  |  |  |  | 3,282,098 |  |  |  |  |  |  |  | 3,035,550 |  |  |  |  | 3,282,098 |
Investments in, at equity, and advances to unconsolidated companies |  | 49,367 |  |  |  |  |  |  |  | 45,115 |  |  |  |  |  |  |  | 49,367 |  |  |  |  | 45,115 |
Assets except corporate portion |  | 3,084,917 |  |  |  |  |  |  |  | 3,327,213 |  |  |  |  |  |  |  | 3,084,917 |  |  |  |  | 3,327,213 |
Predecessor | All Other Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 876 |  |  |  |  | (1,548) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,139 |  |  |  |  | 4,430 |
Assets |  | 20,392 |  |  |  |  |  |  |  | 21,580 |  |  |  |  |  |  |  | 20,392 |  |  |  |  | 21,580 |
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (337) |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,344 |  |  |  |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,935 |  |  |  |
Assets |  |  |  |  |  | 1,248,682 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,248,682 |  |  |  |
Operating Segments | Americas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,784 |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,599) |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,767 |  |  |  |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 144 |  |  |  |
Assets | [4] |  |  |  |  | 164,958 |  |  |  |  |  |  |  |  |  |  |  |  |  | 164,958 |  |  |  |
Operating Segments | Africa/Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 86,255 |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 811 |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,861 |  |  |  |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 195 |  |  |  |
Assets | [4] |  |  |  |  | 1,035,456 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,035,456 |  |  |  |
Operating Segments | Middle East/Asia Pacific |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39,845 |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 451 |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,716 |  |  |  |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,596 |  |  |  |
Assets | [4] |  |  |  |  | 48,268 |  |  |  |  |  |  |  |  |  |  |  |  |  | 48,268 |  |  |  |
Operating Segments | Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (45,491) |  |  |  |  | (57,832) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,604 |  |  |  |  | 160,405 |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,444 |  |  |  |  | 2,448 |
Assets |  | 3,015,158 |  |  |  |  |  |  |  | 3,260,518 |  |  |  |  |  |  |  | 3,015,158 |  |  |  |  | 3,260,518 |
Operating Segments | Predecessor | Americas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 40,848 |  |  |  |  | 239,843 |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (22,549) |  |  |  |  | 18,873 |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,945 |  |  |  |  | 48,814 |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 27 |  |  |  |  | 93 |
Assets | [4] | 714,891 |  |  |  |  |  |  |  | 779,778 |  |  |  |  |  |  |  | 714,891 |  |  |  |  | 779,778 |
Operating Segments | Predecessor | Africa/Europe |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 69,436 |  |  |  |  | 229,355 |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (21,508) |  |  |  |  | (51,395) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 21,692 |  |  |  |  | 70,742 |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 375 |  |  |  |  | 743 |
Assets | [4] | 1,875,371 |  |  |  |  |  |  |  | 1,897,355 |  |  |  |  |  |  |  | 1,875,371 |  |  |  |  | 1,897,355 |
Operating Segments | Predecessor | Middle East/Asia Pacific |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vessel revenues |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36,313 |  |  |  |  | 114,618 |
Operating profit (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,434) |  |  |  |  | (25,310) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,967 |  |  |  |  | 40,849 |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,042 |  |  |  |  | 1,612 |
Assets | [4] | 424,896 |  |  |  |  |  |  |  | 583,385 |  |  |  |  |  |  |  | 424,896 |  |  |  |  | 583,385 |
Corporate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14,823) |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 166 |  |  |  |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,899 |  |  |  |
Assets | [6] |  |  |  |  | $ 465,839 |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 465,839 |  |  |  |
Corporate | Predecessor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses | [5] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (17,542) |  |  |  |  | (55,389) |
Depreciation and amortization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 704 |  |  |  |  | 2,456 |
Additions to properties and equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 821 |  |  |  |  | 28,099 |
Assets | [6] | $ 799,752 |  |  |  |  |  |  |  | $ 863,486 |  |  |  |  |  |  |  | $ 799,752 |  |  |  |  | $ 863,486 |
[1] | The period August 1, 2017 through December 31, 2017 and the year ended March 31, 2017 included $2.3 million and $2.2 million, respectively, of impairments related to inventory and other non-vessel assets.
[2] | Operating income consists of revenues less operating costs and expenses, depreciation, vessel operating leases, goodwill impairment, restructuring charges, asset impairments, general and administrative expenses and gain on asset dispositions, net, of the company’s operations. Asset impairments, net, are as follows:
[3] | Included in revenues for the quarter ended March 31, 2017 is $39.1 million of revenue related to early cancellation of a long-term vessel charter contract
[4] | Marine support services are conducted worldwide with assets that are highly mobile. Revenues are principally derived from offshore service vessels, which regularly and routinely move from one operating area to another, often to and from offshore operating areas in different continents. Because of this asset mobility, revenues and long-lived assets attributable to the company’s international marine operations in any one country are not material.
[5] | Restructuring-related professional services costs for the five month period from August 1, 2017 through December 31, 2017 are included in reorganization items. Included in corporate general and administrative expenses for the period four month period April 1, 2017 through July 31, 2017 (Predecessor) and year ended March 31, 2017 (Predecessor) were $6.7 million and $29 million of restructuring-related professional service costs, respectively.
[6] | Included in Corporate are vessels currently under construction which had not yet been assigned to a non-corporate reporting segment. The vessel construction costs will be reported in Corporate until the earlier of the vessels being assigned to a non-corporate reporting segment or the vessels’ delivery. At December 31, 2017 (Successor), July 31, 2017 (Predecessor) and March 31, 2017 (Predecessor), was $9.3 million, $47.5 million and $52.4 million, respectively, of vessel construction costs were included in Corporate.

X
- Definition Assets except for corporate portion. + References No definition available. + Details
Name: | tdw_AssetsExceptForCorporatePortion
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Assets excluding equity investments. + References No definition available. + Details
Name: | tdw_AssetsExcludingEquityInvestments
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Corporate expenses + References No definition available. + Details
Name: | tdw_CorporateExpenses
Namespace Prefix: | tdw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_AssetImpairmentCharges
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_Assets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_DepreciationAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_EquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450222&loc=d3e30840-110895 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30700-110894 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64836518&loc=d3e30690-110894 + Details
Name: | us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 + Details
Name: | us-gaap_GainLossOnDispositionOfAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_GeneralAndAdministrativeExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1,2) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_GrossProfit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_InterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The aggregate amount of income from investments (for example, dividends) not considered a component of the entity's core operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_InvestmentIncomeNonoperating
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount, after sales adjustments, returns, allowances, and discounts, of revenue classified as other. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_OtherSalesRevenueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of acquisition of long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentAdditions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Total amount of reorganization items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 55 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84165509&loc=d3e56145-112766 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 852 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=64805424&loc=d3e55730-112764 + Details
Name: | us-gaap_ReorganizationItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Aggregate revenue during the period from services rendered in the normal course of business, after deducting allowances and discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_SalesRevenueServicesNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_PredecessorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=tdw_AmericasSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=tdw_AfricaAndEuropeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=tdw_MiddleEastAndAsiaPacificSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |