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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 6 Months Ended 9 Months Ended 12 Months Ended
Jul. 31, 2017
Sep. 30, 2017
 [3]
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Jul. 31, 2017
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2016
Mar. 31, 2017
Segment Reporting Information [Line Items]                              
Total revenues     $ 105,601               $ 178,753 $ 197,094      
Operating profit (loss)     7,647               1,277 6,504      
General and administrative expenses     (24,425)               (46,619) (47,990)      
Corporate expenses     (7,910)               (14,989) (14,694)      
Gain on asset dispositions, net     1,338               6,616 3,257      
Asset impairments     (1,215) [1] $ (16,777)             (16,777) [2] (7,401) [1]      
Operating loss   $ (5,782) (140) (18,091) [3]             (23,873) (12,334)      
Foreign exchange loss     (1,002)               (407) (1,350)      
Equity in net earnings (losses) of unconsolidated companies     390               2,130 (15,049)      
Interest income and other, net     2,914               2,771 2,786      
Reorganization items                     (4,299)        
Interest and other debt costs, net     (7,547)               (13,009) (15,146)      
Loss before income taxes     (5,385)               (36,687) (41,093)      
Depreciation and amortization     12,785               20,337 24,802      
Additions to properties and equipment     4,097               9,834 5,775      
Assets excluding equity investments [4]     1,179,617 1,251,125 [5]             1,251,125 [5] 1,179,617      
Investments in and advances to unconsolidated companies     1,335 29,216             29,216 1,335      
Assets except corporate portion     1,180,953 1,280,341             1,280,341 1,180,953      
Assets     1,643,542 1,746,180             1,746,180 1,643,542      
All Other Segments                              
Segment Reporting Information [Line Items]                              
Operating profit (loss)     778               1,614 2,284      
Depreciation and amortization     5               827 10      
Assets [4]     363 2,443 [5]             2,443 [5] 363      
Operating Segments                              
Segment Reporting Information [Line Items]                              
Operating profit (loss)     6,869               (337) 4,220      
Depreciation and amortization     12,680               19,344 24,592      
Additions to properties and equipment     2,438               2,935 3,899      
Assets [4]     1,179,254 1,248,682 [5]             1,248,682 [5] 1,179,254      
Operating Segments | Americas                              
Segment Reporting Information [Line Items]                              
Operating profit (loss)     5,681               (1,599) 10,592      
Depreciation and amortization     3,530               5,767 6,843      
Additions to properties and equipment     1,230               144 2,267      
Assets [4],[6]     310,121 164,958 [5]             164,958 [5] 310,121      
Operating Segments | Middle East/Asia Pacific                              
Segment Reporting Information [Line Items]                              
Operating profit (loss)     625               451 (1,628)      
Depreciation and amortization     2,844               4,716 5,613      
Additions to properties and equipment     1,073               2,596 1,496      
Assets [4]     215,105 48,268 [5]             48,268 [5] 215,105      
Operating Segments | Europe/Mediterranean Sea                              
Segment Reporting Information [Line Items]                              
Operating profit (loss)     (1,142)               (1,497) (4,696)      
Depreciation and amortization     2,239               2,794 4,043      
Additions to properties and equipment     135                 135      
Assets [4]     167,695 171,157 [5]             171,157 [5] 167,695      
Operating Segments | West Africa                              
Segment Reporting Information [Line Items]                              
Operating profit (loss)     1,705               2,308 (48)      
Depreciation and amortization     4,067               6,067 8,093      
Additions to properties and equipment                     195 1      
Assets [4],[7]     486,333 864,299 [5]             864,299 [5] 486,333      
Corporate                              
Segment Reporting Information [Line Items]                              
General and administrative expenses     (7,810)               (14,823) [8] (14,494)      
Depreciation and amortization     100               166 200      
Additions to properties and equipment     1,659 [9]               6,899 1,876 [9]      
Assets [10]     462,589 $ 465,839 [11]             465,839 [11] 462,589      
Vessel Revenues                              
Segment Reporting Information [Line Items]                              
Total revenues     104,174               171,884 191,668      
Vessel Revenues | Americas                              
Segment Reporting Information [Line Items]                              
Total revenues     32,601                 58,682      
Vessel Revenues | Middle East/Asia Pacific                              
Segment Reporting Information [Line Items]                              
Total revenues     22,406                 40,794      
Vessel Revenues | Europe/Mediterranean Sea                              
Segment Reporting Information [Line Items]                              
Total revenues     13,357                 22,980      
Vessel Revenues | West Africa                              
Segment Reporting Information [Line Items]                              
Total revenues     35,810                 69,212      
Vessel Revenues | Operating Segments | Americas                              
Segment Reporting Information [Line Items]                              
Total revenues     32,601               45,784 58,682      
Vessel Revenues | Operating Segments | Middle East/Asia Pacific                              
Segment Reporting Information [Line Items]                              
Total revenues     22,406               39,845 40,794      
Vessel Revenues | Operating Segments | Europe/Mediterranean Sea                              
Segment Reporting Information [Line Items]                              
Total revenues     13,357               19,895 22,980      
Vessel Revenues | Operating Segments | West Africa                              
Segment Reporting Information [Line Items]                              
Total revenues     35,810               66,360 69,212      
Other Operating Revenues                              
Segment Reporting Information [Line Items]                              
Total revenues     $ 1,427 [12]               $ 6,869 $ 5,426 [12]      
Predecessor                              
Segment Reporting Information [Line Items]                              
Total revenues         $ 115,106         $ 151,369     $ 275,855   $ 601,611
Operating profit (loss)         (29,897)         (44,615)     (18,123)   (59,380)
General and administrative expenses         (33,059)         (41,832)     (74,786)   (145,879)
Corporate expenses         (15,243)         (18,246)     (37,564)   (57,845)
Gain on asset dispositions, net         3,189         3,561     9,253   24,099
Asset impairments $ (21,325)       (163,423) [1] $ (64,857) $ (253,422) $ (129,562) $ (36,886) (184,748) [2]     (228,280) [1]   (484,727) [2]
Operating loss (38,674) [3]       (205,374) [3] (69,340) [3],[13] $ (287,034) [3],[13] $ (155,344) [3],[13] $ (66,135) [3],[13] (244,048)     (274,714) $ (508,513) (577,853)
Foreign exchange loss         (1,157)         (3,181)     (493)   (1,638)
Equity in net earnings (losses) of unconsolidated companies         4,517         4,786     7,358   5,710
Interest income and other, net         1,680         2,384     3,268   5,193
Reorganization items         (313,176)         (1,396,905)     (313,176)    
Interest and other debt costs, net         (10,605)         (11,179)     (31,613)   (75,026)
Loss before income taxes         (524,115)         (1,648,143)     (609,370) $ (558,359) (643,614)
Depreciation and amortization         36,287         47,447     73,879   167,291
Additions to properties and equipment         1,627         2,265     9,700   30,547
Assets excluding equity investments [5] 3,035,550         3,282,098       3,035,550         3,282,098
Investments in 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
Assets 3,884,669         4,190,699       3,884,669         4,190,699
Predecessor | All Other Segments                              
Segment Reporting Information [Line Items]                              
Operating profit (loss)         55         876     (170)   (1,548)
Depreciation and amortization         854         1,139     1,709   4,430
Assets [5] 20,392         21,580       20,392         21,580
Predecessor | Operating Segments                              
Segment Reporting Information [Line Items]                              
Operating profit (loss)         (29,952)         (45,491)     (17,953)   (57,832)
Depreciation and amortization         34,892         45,604     71,065   160,405
Additions to properties and equipment         949         1,444     2,068   2,448
Assets [5] 3,015,158         3,260,518       3,015,158         3,260,518
Predecessor | Operating Segments | Americas                              
Segment Reporting Information [Line Items]                              
Operating profit (loss)         (15,699)         (22,549)     14,919   18,873
Depreciation and amortization         10,748         13,945     22,045   48,814
Additions to properties and equipment         27         27     27   93
Assets [5] 714,891         779,778       714,891         779,778
Predecessor | Operating Segments | Middle East/Asia Pacific                              
Segment Reporting Information [Line Items]                              
Operating profit (loss)         (1,316)         (1,434)     (7,480)   (25,310)
Depreciation and amortization         7,746         9,967     16,245   40,849
Additions to properties and equipment         648         1,042     1,673   1,612
Assets [5] 424,896         583,385       424,896         583,385
Predecessor | Operating Segments | Europe/Mediterranean Sea                              
Segment Reporting Information [Line Items]                              
Operating profit (loss)         (10,163)         (12,680)     (17,265)   (26,733)
Depreciation and amortization         6,803         9,060     13,364   26,538
Assets [5] 597,819         588,519       597,819         588,519
Predecessor | Operating Segments | West Africa                              
Segment Reporting Information [Line Items]                              
Operating profit (loss)         (2,774)         (8,828)     (8,127)   (24,662)
Depreciation and amortization         9,595         12,632     19,411   44,204
Additions to properties and equipment         274         375     368   743
Assets [5] 1,277,552         1,308,836       1,277,552         1,308,836
Predecessor | Corporate                              
Segment Reporting Information [Line Items]                              
General and administrative expenses         (14,702)         (17,542) [8]     (36,459)   (55,389) [8]
Depreciation and amortization         541         704     1,105   2,456
Additions to properties and equipment         678 [9]         821     7,632 [9]   28,099
Assets [11] $ 799,752         $ 863,486       799,752         863,486
Predecessor | Vessel Revenues                              
Segment Reporting Information [Line Items]                              
Total revenues         112,257         146,597     269,162   583,816
Predecessor | Vessel Revenues | Americas                              
Segment Reporting Information [Line Items]                              
Total revenues         31,887               112,420    
Predecessor | Vessel Revenues | Middle East/Asia Pacific                              
Segment Reporting Information [Line Items]                              
Total revenues         27,766               54,444    
Predecessor | Vessel Revenues | Europe/Mediterranean Sea                              
Segment Reporting Information [Line Items]                              
Total revenues         11,031               21,197    
Predecessor | Vessel Revenues | West Africa                              
Segment Reporting Information [Line Items]                              
Total revenues         41,573               81,101    
Predecessor | Vessel Revenues | Operating Segments | Americas                              
Segment Reporting Information [Line Items]                              
Total revenues         31,887         40,848     112,420   239,843
Predecessor | Vessel Revenues | Operating Segments | Middle East/Asia Pacific                              
Segment Reporting Information [Line Items]                              
Total revenues         27,766         36,313     54,444   114,618
Predecessor | Vessel Revenues | Operating Segments | Europe/Mediterranean Sea                              
Segment Reporting Information [Line Items]                              
Total revenues         11,031         15,466     21,197   42,667
Predecessor | Vessel Revenues | Operating Segments | West Africa                              
Segment Reporting Information [Line Items]                              
Total revenues         41,573         53,970     81,101   186,688
Predecessor | Other Operating Revenues                              
Segment Reporting Information [Line Items]                              
Total revenues         $ 2,849 [12]         $ 4,772     $ 6,693 [12]   $ 17,795
[1] Refer to Note (14) for additional information regarding asset impairment.
[2] 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.
[3] 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 Tidewater's operations. Asset impairments, net, are as follows:
[4] Tidewater's segment level assets as of June 30, 2018, reflect the elimination of certain intersegment balances.
[5] 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 Tidewater's international marine operations in any one country are not material.
[6] Americas segment assets include cash held by non-corporate subsidiaries of $94.6 million and 95.1 million, as of June 30, 2018 and December 31, 2017, respectively.
[7] West Africa segment assets include due from related parties of $197.1 million and $263.7 million as of June 30, 2018 and December 31, 2017, respectively.
[8] 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.
[9] Included in Corporate are additions to properties and equipment relating to a vessel under construction which has not yet been assigned to a non-corporate reporting segment as of the dates presented.
[10] Corporate includes cash (including restricted cash) of $353.2 million and $336.4 million as of June 30, 2018 and December 31. 2017, respectively. Also included in Corporate is a vessel under construction which has not yet been assigned to a non-corporate reporting segment. A vessel's construction costs are reported in Corporate until the earlier of the date the vessel is assigned to a non-corporate reporting segment or the date it is delivered. At June 30, 2018 and December 31, 2017, $11.2 million and $9.3 million, respectively, of vessel construction costs are included in Corporate.
[11] 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.
[12] Included in other operating revenues for the quarter and six months ended June 30, 2017, were $0.5 million and $0.8 million, respectively, of revenues related to the company's subsea business. The eight ROVs representing substantially all of the company's subsea assets were sold in December 2017.
[13] For the quarter and six months periods ended June 30, 2018, there were 2 and 15 stacked vessels impaired, respectively. For the quarter ended June 30, 2017, there were 72 stacked vessels and 5 active vessels impaired, respectively and for the six month period ended June 30, 2017 there were 83 stacked vessels and 6 active vessels impaired, respectively.