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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 9 Months Ended 12 Months Ended
Jul. 31, 2017
Sep. 30, 2017
 [2]
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]                        
Total revenues                   $ 178,753    
Operating profit (loss)                   1,277    
General and administrative expenses                   (46,619)    
Corporate expenses                   (14,989)    
Gain on asset dispositions, net                   6,616    
Asset impairments     $ (16,777)             (16,777) [1]    
Operating loss   $ (5,782) (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, net                   (13,009)    
Loss before income taxes                   (36,687)    
Depreciation and amortization                   20,337    
Additions to properties and equipment                   9,834    
Assets excluding equity investments [3]     1,251,125             1,251,125    
Investments in and advances to unconsolidated companies     29,216             29,216    
Assets except corporate portion     1,280,341             1,280,341    
Assets     1,746,180             1,746,180    
All Other Segments                        
Segment Reporting Information [Line Items]                        
Operating profit (loss)                   1,614    
Depreciation and amortization                   827    
Assets [3]     2,443             2,443    
Operating Segments                        
Segment Reporting Information [Line Items]                        
Operating profit (loss)                   (337)    
Depreciation and amortization                   19,344    
Additions to properties and equipment                   2,935    
Assets [3]     1,248,682             1,248,682    
Operating Segments | Americas                        
Segment Reporting Information [Line Items]                        
Operating profit (loss)                   (1,599)    
Depreciation and amortization                   5,767    
Additions to properties and equipment                   144    
Assets [3]     164,958             164,958    
Operating Segments | Middle East/Asia Pacific                        
Segment Reporting Information [Line Items]                        
Operating profit (loss)                   451    
Depreciation and amortization                   4,716    
Additions to properties and equipment                   2,596    
Assets [3]     48,268             48,268    
Operating Segments | Europe/Mediterranean Sea                        
Segment Reporting Information [Line Items]                        
Operating profit (loss)                   (1,497)    
Depreciation and amortization                   2,794    
Assets [3]     171,157             171,157    
Operating Segments | West Africa                        
Segment Reporting Information [Line Items]                        
Operating profit (loss)                   2,308    
Depreciation and amortization                   6,067    
Additions to properties and equipment                   195    
Assets [3]     864,299             864,299    
Corporate                        
Segment Reporting Information [Line Items]                        
General and administrative expenses [4]                   (14,823)    
Depreciation and amortization                   166    
Additions to properties and equipment                   6,899    
Assets [5]     $ 465,839             465,839    
Vessel Revenues                        
Segment Reporting Information [Line Items]                        
Total revenues                   171,884    
Vessel Revenues | Operating Segments | Americas                        
Segment Reporting Information [Line Items]                        
Total revenues                   45,784    
Vessel Revenues | Operating Segments | Middle East/Asia Pacific                        
Segment Reporting Information [Line Items]                        
Total revenues                   39,845    
Vessel Revenues | Operating Segments | Europe/Mediterranean Sea                        
Segment Reporting Information [Line Items]                        
Total revenues                   19,895    
Vessel Revenues | Operating Segments | West Africa                        
Segment Reporting Information [Line Items]                        
Total revenues                   66,360    
Other Operating Revenues                        
Segment Reporting Information [Line Items]                        
Total revenues                   $ 6,869    
Predecessor                        
Segment Reporting Information [Line Items]                        
Total revenues                 $ 151,369     $ 601,611
Operating profit (loss)                 (44,615)     (59,380)
General and administrative expenses                 (41,832)     (145,879)
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],[6] $ (287,034) [2],[6] $ (155,344) [2],[6] $ (66,135) [2],[6] (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, net                 (11,179)     (75,026)
Loss before income taxes                 (1,648,143)   $ (558,359) (643,614)
Depreciation and amortization                 47,447     167,291
Additions to properties and equipment                 2,265     30,547
Assets excluding equity investments [3] 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)                 876     (1,548)
Depreciation and amortization                 1,139     4,430
Assets [3] 20,392       21,580       20,392     21,580
Predecessor | Operating Segments                        
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] 3,015,158       3,260,518       3,015,158     3,260,518
Predecessor | Operating Segments | Americas                        
Segment Reporting Information [Line Items]                        
Operating profit (loss)                 (22,549)     18,873
Depreciation and amortization                 13,945     48,814
Additions to properties and equipment                 27     93
Assets [3] 714,891       779,778       714,891     779,778
Predecessor | Operating Segments | Middle East/Asia Pacific                        
Segment Reporting Information [Line Items]                        
Operating profit (loss)                 (1,434)     (25,310)
Depreciation and amortization                 9,967     40,849
Additions to properties and equipment                 1,042     1,612
Assets [3] 424,896       583,385       424,896     583,385
Predecessor | Operating Segments | Europe/Mediterranean Sea                        
Segment Reporting Information [Line Items]                        
Operating profit (loss)                 (12,680)     (26,733)
Depreciation and amortization                 9,060     26,538
Assets [3] 597,819       588,519       597,819     588,519
Predecessor | Operating Segments | West Africa                        
Segment Reporting Information [Line Items]                        
Operating profit (loss)                 (8,828)     (24,662)
Depreciation and amortization                 12,632     44,204
Additions to properties and equipment                 375     743
Assets [3] 1,277,552       1,308,836       1,277,552     1,308,836
Predecessor | Corporate                        
Segment Reporting Information [Line Items]                        
General and administrative expenses [4]                 (17,542)     (55,389)
Depreciation and amortization                 704     2,456
Additions to properties and equipment                 821     28,099
Assets [5] $ 799,752       $ 863,486       799,752     863,486
Predecessor | Vessel Revenues                        
Segment Reporting Information [Line Items]                        
Total revenues                 146,597     583,816
Predecessor | Vessel Revenues | Operating Segments | Americas                        
Segment Reporting Information [Line Items]                        
Total revenues                 40,848     239,843
Predecessor | Vessel Revenues | Operating Segments | Middle East/Asia Pacific                        
Segment Reporting Information [Line Items]                        
Total revenues                 36,313     114,618
Predecessor | Vessel Revenues | Operating Segments | Europe/Mediterranean Sea                        
Segment Reporting Information [Line Items]                        
Total revenues                 15,466     42,667
Predecessor | Vessel Revenues | Operating Segments | West Africa                        
Segment Reporting Information [Line Items]                        
Total revenues                 53,970     186,688
Predecessor | Other Operating Revenues                        
Segment Reporting Information [Line Items]                        
Total revenues                 $ 4,772     $ 17,795
[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 Tidewater's operations. Asset impairments, net, are as follows:
[3] 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.
[4] 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.
[5] 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.
[6] 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.