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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.

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