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Segment Information, Geographical Data and Major Customers (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Vessel revenues | $ 390,952 |  | $ 363,668 |  | $ 772,462 |  | $ 695,298 |
Other operating revenues | 6,572 |  | 4,269 |  | 10,739 |  | 6,724 |
Operating profit | 90,912 |  | 89,407 |  | 167,121 |  | 147,247 |
Total revenues | 397,524 |  | 367,937 |  | 783,201 |  | 702,022 |
Depreciation and amortization | 43,708 |  | 42,056 |  | 86,819 |  | 82,164 |
General and administrative expenses | (46,762) |  | (46,038) |  | (97,822) |  | (96,518) |
Additions to properties and equipment |  |  |  |  | 128,411 |  | 220,309 |
Corporate expenses | (9,779) |  | (12,891) |  | (22,927) |  | (29,446) |
Gain on asset dispositions, net | 3,590 |  | 49 |  | 6,533 |  | 2,189 |
Operating income | 84,723 |  | 76,565 |  | 150,727 |  | 119,990 |
Foreign exchange loss | 5,408 |  | 3,017 |  | 4,119 |  | 2,928 |
Equity in net earnings of unconsolidated companies | 3,821 |  | 3,781 |  | 9,104 |  | 8,201 |
Interest income and other, net | 499 |  | 538 |  | 1,121 |  | 1,278 |
Loss on early extinguishment of debt |  |  | (4,144) |  |  |  | (4,144) |
Interest and other debt costs | (12,559) |  | (9,918) |  | (25,688) |  | (18,831) |
Earnings before income taxes | 81,892 |  | 69,839 |  | 139,383 |  | 109,422 |
Additions to properties and equipment | 87,101 |  | 67,901 |  | 132,199 |  | 470,070 |
Operating Segments |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating profit | 93,005 |  | 89,189 |  | 171,637 |  | 147,421 |
Depreciation and amortization | 41,974 |  | 41,267 |  | 83,399 |  | 80,663 |
Additions to properties and equipment | 50,679 |  | 18,154 |  | 69,995 |  | 358,473 |
Operating Segments | Americas |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Vessel revenues | 134,013 |  | 101,929 |  | 253,996 |  | 192,173 |
Operating profit | 36,778 |  | 23,675 |  | 66,986 |  | 43,976 |
Depreciation and amortization | 12,390 |  | 10,833 |  | 23,798 |  | 20,943 |
Additions to properties and equipment | 15,397 |  | 8,845 |  | 31,635 |  | 12,039 |
Operating Segments | Asia/Pacific |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Vessel revenues | 45,989 |  | 37,430 |  | 86,238 |  | 80,386 |
Operating profit | 7,414 |  | 4,807 |  | 6,443 |  | 15,096 |
Depreciation and amortization | 4,421 |  | 4,122 |  | 8,807 |  | 8,647 |
Additions to properties and equipment | 23,138 |  | 453 |  | 23,211 |  | 968 |
Operating Segments | Middle East/North Africa |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Vessel revenues | 48,837 |  | 45,370 |  | 104,376 |  | 86,583 |
Operating profit | 7,367 |  | 13,446 |  | 19,160 |  | 23,569 |
Depreciation and amortization | 6,785 |  | 5,731 |  | 13,367 |  | 11,337 |
Additions to properties and equipment | 805 |  | 770 |  | 1,235 |  | 909 |
Operating Segments | Sub-Saharan Africa/Europe |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Vessel revenues | 162,113 |  | 178,939 |  | 327,852 |  | 336,156 |
Operating profit | 41,446 |  | 47,261 |  | 79,048 |  | 64,780 |
Depreciation and amortization | 18,378 |  | 20,581 |  | 37,427 |  | 39,736 |
Additions to properties and equipment | 11,339 | [1] | 8,086 | [1] | 13,914 | [1] | 344,557 | [1]
Other |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Operating profit | (2,093) |  | 218 |  | (4,516) |  | (174) |
Depreciation and amortization | 898 |  |  |  | 1,768 |  | 2 |
Additions to properties and equipment | 4,689 |  |  |  | 8,725 |  |  |
Corporate |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Depreciation and amortization | 836 |  | 789 |  | 1,652 |  | 1,499 |
General and administrative expenses | (8,943) |  | (12,102) |  | (21,275) |  | (27,947) |
Additions to properties and equipment | $ 31,733 | [2] | $ 49,747 | [2] | $ 53,479 | [2] | $ 111,597 | [2]
[1] | Included in Sub-Saharan Africa/Europe for the six months ended September 30, 2013 is $245.6 million related to vessels acquired through the acquisition of Troms Offshore.
[2] | 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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