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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.