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Segment Information, Geographical Data and Major Customers (Detail) - Entity [Domain] - USD ($)
$ in Thousands
 3 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Segment Reporting Information [Line Items]    
Vessel revenues $ 298,313 $ 381,510
Other operating revenues 6,461 4,167
Operating profit 33,204 76,209
Total revenues 304,774 385,677
Depreciation and amortization 45,657 43,111
General and administrative expenses 43,953 51,060
Additions to properties and equipment 93,019 45,098
Corporate expenses (11,508) (13,148)
Gain/(loss) on asset dispositions, net (7,607) 2,943
Operating income 14,089 66,004
Foreign exchange loss (4,133) (1,289)
Equity in net earnings/(losses) of unconsolidated companies (2,441) 5,283
Interest income and other, net 790 622
Interest and other debt costs, net (13,182) (13,129)
Earnings (loss) before income taxes (4,877) 57,491
Operating Segments    
Segment Reporting Information [Line Items]    
Operating profit 35,040 78,632
Depreciation and amortization 42,749 41,425
Additions to properties and equipment 23,254 19,316
Operating Segments | Americas    
Segment Reporting Information [Line Items]    
Vessel revenues 114,172 119,983
Operating profit 23,839 30,208
Depreciation and amortization 12,050 11,408
Additions to properties and equipment 22,054 16,238
Operating Segments | Asia/Pacific    
Segment Reporting Information [Line Items]    
Vessel revenues 27,937 40,249
Operating profit 1,750 (971)
Depreciation and amortization 5,389 4,386
Additions to properties and equipment 635 73
Operating Segments | Middle East/North Africa    
Segment Reporting Information [Line Items]    
Vessel revenues 47,266 55,539
Operating profit 8,160 11,793
Depreciation and amortization 7,075 6,582
Additions to properties and equipment 292 430
Operating Segments | Sub-Saharan Africa/Europe    
Segment Reporting Information [Line Items]    
Vessel revenues 108,938 165,739
Operating profit 1,291 37,602
Depreciation and amortization 18,235 19,049
Additions to properties and equipment 273 2,575
Other    
Segment Reporting Information [Line Items]    
Operating profit (1,836) (2,423)
Depreciation and amortization 1,414 870
Additions to properties and equipment   4,036
Corporate    
Segment Reporting Information [Line Items]    
Depreciation and amortization 1,494 816
General and administrative expenses (10,014) (12,332)
Additions to properties and equipment [1] $ 69,765 $ 21,746
[1] 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.