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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 | 6 Months Ended
--- | --- | --- | --- | --- | ---
Jul. 31, 2017 | Sep. 30, 2017 | Sep. 30, 2016 | Jul. 31, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
Vessel revenues |  |  | $ 70,571 |  |  |
Other operating revenues |  |  | 3,729 |  |  |
Total revenues |  |  | 74,300 |  |  |
Operating profit (loss) |  |  | (922) |  |  |
General and administrative expenses |  |  | (16,246) |  |  |
Depreciation and amortization |  |  | 8,142 |  |  |
Corporate expenses |  |  | (4,864) |  |  |
Gain on asset dispositions, net |  |  | 4 |  |  |
Operating loss |  |  | (5,782) |  |  |
Foreign exchange loss |  |  | (58) |  |  |
Equity in net earnings of unconsolidated companies |  |  | 1,305 |  |  |
Interest income and other |  |  | 873 |  |  |
Reorganization items | [1] |  | (1,880) |  |  |
Interest and other debt costs |  |  | (5,240) |  |  |
Loss before income taxes |  |  | (10,782) |  |  |
Additions to properties and equipment |  |  | 589 |  |  |
All Other Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating profit (loss) |  |  | 809 |  |  |
Depreciation and amortization |  |  | 412 |  |  |
Predecessor |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Vessel revenues |  | $ 34,340 |  | $ 139,361 | $ 146,597 | $ 301,791
Other operating revenues |  | 1,923 |  | 4,361 | 4,772 | 9,856
Total revenues |  | 36,263 |  | 143,722 | 151,369 | 311,647
Operating profit (loss) |  | (14,718) |  | (21,432) | (44,615) | (45,101)
General and administrative expenses |  | (8,773) |  | (32,954) | (41,832) | (70,001)
Depreciation and amortization |  | 11,160 |  | 43,845 | 47,447 | 88,397
Corporate expenses |  | (3,003) |  | (10,603) | (18,246) | (21,826)
Gain on asset dispositions, net |  | 372 |  | 6,253 | 3,561 | 11,896
Asset impairments | [2] | (21,325) |  | (129,562) | (184,748) | (166,448)
Operating loss |  | (38,674) |  | (155,344) | (244,048) | (221,479)
Foreign exchange loss |  | (2,024) |  | (2,539) | (3,181) | (5,272)
Equity in net earnings of unconsolidated companies |  | 269 |  | 1,313 | 4,786 | 1,312
Interest income and other |  | 704 |  | 992 | 2,384 | 2,168
Reorganization items | [1] | (1,083,729) |  |  | (1,396,905) |
Interest and other debt costs |  | (574) |  | (18,477) | (11,179) | (35,431)
Loss before income taxes |  | (1,124,028) |  | (174,055) | (1,648,143) | (258,702)
Additions to properties and equipment |  | 638 |  | 9,871 | 2,265 | 19,986
Predecessor | All Other Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating profit (loss) |  | 821 |  | (1,012) | 876 | (1,439)
Depreciation and amortization |  | 285 |  | 1,339 | 1,139 | 2,720
Operating Segments |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating profit (loss) |  |  | (1,731) |  |  |
Depreciation and amortization |  |  | 7,663 |  |  |
Additions to properties and equipment |  |  | 536 |  |  |
Operating Segments | Americas |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Vessel revenues |  |  | 17,449 |  |  |
Operating profit (loss) |  |  | (2,651) |  |  |
Depreciation and amortization |  |  | 2,295 |  |  |
Operating Segments | Middle East/Asia Pacific |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Vessel revenues |  |  | 16,669 |  |  |
Operating profit (loss) |  |  | 944 |  |  |
Depreciation and amortization |  |  | 1,807 |  |  |
Additions to properties and equipment |  |  | 377 |  |  |
Operating Segments | Africa/Europe |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Vessel revenues |  |  | 36,453 |  |  |
Operating profit (loss) |  |  | (24) |  |  |
Depreciation and amortization |  |  | 3,561 |  |  |
Additions to properties and equipment |  |  | 159 |  |  |
Operating Segments | Predecessor |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Operating profit (loss) |  | (15,539) |  | (20,420) | (45,491) | (43,662)
Depreciation and amortization |  | 10,712 |  | 41,909 | 45,604 | 84,350
Additions to properties and equipment |  | 495 |  | 426 | 1,444 | 848
Operating Segments | Predecessor | Americas |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Vessel revenues |  | 8,961 |  | 53,125 | 40,848 | 113,733
Operating profit (loss) |  | (6,850) |  | (1,177) | (22,549) | (5,503)
Depreciation and amortization |  | 3,197 |  | 12,700 | 13,945 | 25,478
Additions to properties and equipment |  |  |  |  | 27 | 75
Operating Segments | Predecessor | Middle East/Asia Pacific |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Vessel revenues |  | 8,547 |  | 29,584 | 36,313 | 61,707
Operating profit (loss) |  | (118) |  | (5,171) | (1,434) | (10,778)
Depreciation and amortization |  | 2,221 |  | 10,779 | 9,967 | 21,673
Additions to properties and equipment |  | 394 |  | 34 | 1,042 | 314
Operating Segments | Predecessor | Africa/Europe |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Vessel revenues |  | 16,832 |  | 56,652 | 69,436 | 126,351
Operating profit (loss) |  | (8,571) |  | (14,072) | (21,508) | (27,381)
Depreciation and amortization |  | 5,294 |  | 18,430 | 21,692 | 37,199
Additions to properties and equipment |  | 101 |  | 392 | 375 | 459
Corporate |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
General and administrative expenses |  |  | (4,797) |  |  |
Depreciation and amortization |  |  | 67 |  |  |
Additions to properties and equipment | [3] |  | $ 53 |  |  |
Corporate | Predecessor |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
General and administrative expenses |  | (2,840) |  | (10,006) | (17,542) | (20,499)
Depreciation and amortization |  | 163 |  | 597 | 704 | 1,327
Additions to properties and equipment | [3] | $ 143 |  | $ 9,445 | $ 821 | $ 19,138
[1] | Refer to Note (4) for additional information regarding reorganization items.
[2] | Refer to Note (16) for additional information regarding asset impairment charges.
[3] | Included in Corporate are additions to properties and equipment relating to vessels currently under construction which have not yet been assigned to a non-corporate reporting segment as of the dates presented.

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