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Segment Information, Geographical Data and Major Customers (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Segment Reporting Information [Line Items]    
Vessel revenues $ 381,510 $ 331,630
Other operating revenues 4,167 2,455
Operating profit 76,209 57,840
Total revenues 385,677 334,085
Depreciation and amortization 43,111 40,108
General and administrative expenses (51,060) (50,480)
Additions to properties and equipment 39,874 156,434
Corporate expenses (13,148) (16,555)
Gain on asset dispositions, net 2,943 2,140
Operating income 66,004 43,425
Foreign exchange loss (1,289) (89)
Equity in net earnings of unconsolidated companies 5,283 4,420
Interest income and other, net 622 740
Interest and other debt costs, net (13,129) (8,913)
Earnings before income taxes 57,491 39,583
Additions to properties and equipment 45,098 402,169
Operating Segments
    
Segment Reporting Information [Line Items]    
Operating profit 78,632 58,232
Depreciation and amortization 41,425 39,396
Additions to properties and equipment 19,316 340,319
Operating Segments | Americas
    
Segment Reporting Information [Line Items]    
Vessel revenues 119,983 90,244
Operating profit 30,208 20,301
Depreciation and amortization 11,408 10,110
Additions to properties and equipment 16,238 3,194
Operating Segments | Asia/Pacific
    
Segment Reporting Information [Line Items]    
Vessel revenues 40,249 42,956
Operating profit (971) 10,289
Depreciation and amortization 4,386 4,525
Additions to properties and equipment 73 515
Operating Segments | Middle East/North Africa
    
Segment Reporting Information [Line Items]    
Vessel revenues 55,539 41,213
Operating profit 11,793 10,123
Depreciation and amortization 6,582 5,606
Additions to properties and equipment 430 139
Operating Segments | Sub-Saharan Africa/Europe
    
Segment Reporting Information [Line Items]    
Vessel revenues 165,739 157,217
Operating profit 37,602 17,519
Depreciation and amortization 19,049 19,155
Additions to properties and equipment 2,575 [1] 336,471 [1]
Other
    
Segment Reporting Information [Line Items]    
Operating profit (2,423) (392)
Depreciation and amortization 870 2
Additions to properties and equipment 4,036  
Corporate
    
Segment Reporting Information [Line Items]    
Depreciation and amortization 816 710
General and administrative expenses (12,332) (15,845)
Additions to properties and equipment $ 21,746 [2] $ 61,850 [2]
[1] Included in Sub-Saharan Africa/Europe for the quarter ended June 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.