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Segment Information, Geographical Data and Major Customers (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Segment Reporting Information [Line Items]        
Vessel revenues $ 264,131 $ 390,952 $ 562,444 $ 772,462
Other operating revenues 7,792 6,572 14,253 10,739
Operating profit 25,084 90,912 58,288 167,121
Total revenues 271,923 397,524 576,697 783,201
Depreciation and amortization 45,979 43,708 91,636 86,819
General and administrative expenses (37,286) (46,762) (81,239) (97,822)
Additions to properties and equipment 47,442 87,101 140,461 132,199
Corporate expenses (9,581) (9,779) (21,089) (22,927)
Gain on asset dispositions, net 6,111 4,500 13,462 8,393
Asset impairments [1] (31,672) (910) (46,630) (1,860)
Restructuring charge [2] (7,586)   (7,586)  
Operating income (17,644) 84,723 (3,555) 150,727
Foreign exchange gain (loss) 844 5,408 (3,289) 4,119
Equity in net earnings/(losses) of unconsolidated companies (2,919) 3,821 (5,360) 9,104
Interest income and other, net 355 499 1,145 1,121
Interest and other debt costs, net (13,247) (12,559) (26,429) (25,688)
Earnings (loss) before income taxes (32,611) 81,892 (37,488) 139,383
Operating Segments        
Segment Reporting Information [Line Items]        
Operating profit 25,742 93,005 60,782 171,637
Depreciation and amortization 42,828 41,974 85,577 83,399
Additions to properties and equipment 22,526 50,679 45,780 69,995
Operating Segments | Americas        
Segment Reporting Information [Line Items]        
Vessel revenues 89,210 134,013 203,382 253,996
Operating profit 8,812 36,778 32,651 66,986
Depreciation and amortization 12,232 12,390 24,282 23,798
Additions to properties and equipment 20,000 15,397 42,054 31,635
Operating Segments | Asia/Pacific        
Segment Reporting Information [Line Items]        
Vessel revenues 32,173 45,989 60,110 86,238
Operating profit 6,168 7,414 7,918 6,443
Depreciation and amortization 5,311 4,421 10,700 8,807
Additions to properties and equipment 1,075 23,138 1,710 23,211
Operating Segments | Middle East/North Africa        
Segment Reporting Information [Line Items]        
Vessel revenues 45,336 48,837 92,602 104,376
Operating profit 7,515 7,367 15,675 19,160
Depreciation and amortization 7,036 6,785 14,111 13,367
Additions to properties and equipment 357 805 649 1,235
Operating Segments | Sub-Saharan Africa/Europe        
Segment Reporting Information [Line Items]        
Vessel revenues 97,412 162,113 206,350 327,852
Operating profit 3,247 41,446 4,538 79,048
Depreciation and amortization 18,249 18,378 36,484 37,427
Additions to properties and equipment 1,094 11,339 1,367 13,914
Other        
Segment Reporting Information [Line Items]        
Operating profit (658) (2,093) (2,494) (4,516)
Depreciation and amortization 1,502 898 2,916 1,768
Additions to properties and equipment 86 4,689 86 8,725
Corporate        
Segment Reporting Information [Line Items]        
Depreciation and amortization 1,649 836 3,143 1,652
General and administrative expenses (7,932) (8,943) (17,946) (21,275)
Additions to properties and equipment [3] $ 24,830 $ 31,733 $ 94,595 $ 53,479
[1] Refer to Note (15) for additional information regarding asset impairment charges.
[2] Refer to Note (14) for additional information regarding the restructuring charge.
[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.