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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.