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Segment Information, Geographical Data and Major Customers (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Segment Reporting Information [Line Items]                      
Vessel revenues                 $ 1,418,461 $ 1,229,998 $ 1,060,468
Other operating revenues                 16,642 14,167 6,539
Revenues 367,833 365,248 367,937 334,085 328,333 309,466 311,918 294,448 1,435,103 1,244,165 1,067,007
Operating profit                 296,878 251,718 167,208
General and administrative expenses                 (187,976) (175,609) (156,570)
Corporate expenses                 (50,776) (52,095) (40,379)
Gain on asset dispositions, net 2,363 7,170 49 2,140 3,839 99 1,833 838 11,722 6,609 17,657
Goodwill impairment   (56,283)             (56,283)   (30,932)
Operating income 61,063 [1] 20,488 [1] 76,565 [1] 43,425 [1] 58,574 [1] 40,974 [1] 57,197 [1] 49,487 [1] 201,541 206,232 113,554
Foreign exchange gain                 1,541 3,011 3,309
Equity in net earnings of unconsolidated companies                 15,801 12,189 13,041
Interest income and other, net                 2,123 3,476 3,440
Loss on early extinguishment of debt                 (4,144)    
Interest and other debt costs                 (43,814) (29,745) (22,308)
Earnings before income taxes                 173,048 195,163 111,036
Depreciation and amortization                 167,480 147,299 138,356
Additions to properties and equipment                 594,695 440,572 357,110
Additions to properties and equipment                 806,484 452,582 367,960
Assets 4,885,829       4,168,055       4,885,829 4,168,055 4,061,618
Investments in and advances to unconsolidated companies 63,928       46,047       63,928 46,047 46,077
Asia/Pacific
                      
Segment Reporting Information [Line Items]                      
Goodwill impairment   (56,300)                  
Operating Segments
                      
Segment Reporting Information [Line Items]                      
Vessel revenues                 1,418,461 1,229,998 1,060,468
Operating profit                 298,808 252,551 170,075
Depreciation and amortization                 164,111 143,895 134,629
Additions to properties and equipment                 599,410 273,524 173,029
Assets 4,435,925 [2]       3,701,393 [2]       4,435,925 [2] 3,701,393 [2] 3,604,492 [2]
Operating Segments | Sub-Saharan Africa/Europe
                      
Segment Reporting Information [Line Items]                      
Vessel revenues                 666,588 569,513 472,698
Operating profit                 136,092 129,460 97,142
Depreciation and amortization                 79,199 65,241 58,137
Additions to properties and equipment                 488,984 [3] 197,534 [3] 84,491 [3]
Assets 2,383,507 [2]       1,706,355 [2]       2,383,507 [2] 1,706,355 [2] 1,519,124 [2]
Operating Segments | Americas
                      
Segment Reporting Information [Line Items]                      
Vessel revenues                 410,731 327,059 324,529
Operating profit                 90,936 40,318 56,003
Depreciation and amortization                 43,297 40,454 38,128
Additions to properties and equipment                 99,798 52,299 7,279
Assets 1,017,736 [2]       880,368 [2]       1,017,736 [2] 880,368 [2] 1,025,386 [2]
Operating Segments | Asia/Pacific
                      
Segment Reporting Information [Line Items]                      
Vessel revenues                 154,618 184,014 153,752
Operating profit                 29,044 43,704 16,125
Depreciation and amortization                 17,174 19,416 20,758
Additions to properties and equipment                 2,586 19,858 64,431
Assets 421,379 [2]       607,546 [2]       421,379 [2] 607,546 [2] 654,357 [2]
Operating Segments | Middle East/North Africa
                      
Segment Reporting Information [Line Items]                      
Vessel revenues                 186,524 149,412 109,489
Operating profit                 42,736 39,069 805
Depreciation and amortization                 24,441 18,784 17,606
Additions to properties and equipment                 8,042 3,833 16,828
Assets 613,303 [2]       507,124 [2]       613,303 [2] 507,124 [2] 405,625 [2]
Other
                      
Segment Reporting Information [Line Items]                      
Operating profit                 (1,930) (833) (2,867)
Depreciation and amortization                 296 13 13
Additions to properties and equipment                 31,841    
Assets 31,545       5,102       31,545 5,102 6,576
Corporate
                      
Segment Reporting Information [Line Items]                      
General and administrative expenses                 (47,703) [4] (48,704) [4] (36,665) [4]
Depreciation and amortization                 3,073 3,391 3,714
Additions to properties and equipment                 175,233 [5] 179,058 [5] 194,931 [5]
Assets 354,431 [6]       415,513 [6]       354,431 [6] 415,513 [6] 404,473 [6]
Assets Before Equity Method Investments
                      
Segment Reporting Information [Line Items]                      
Assets 4,467,470       3,706,495       4,467,470 3,706,495 3,611,068
Assets Before Corporate Assets
                      
Segment Reporting Information [Line Items]                      
Assets $ 4,531,398       $ 3,752,542       $ 4,531,398 $ 3,752,542 $ 3,657,145
[1] Operating income consists of revenues less operating costs and expenses, depreciation, vessel operating leases, goodwill impairment, general and administrative expenses and gain on asset dispositions, net, of the company's operations. Goodwill impairment by quarter for fiscal 2014 and gain on asset dispositions, net, by quarter for fiscal 2014 and 2013, are as follows:
[2] Marine support services are conducted worldwide with assets that are highly mobile. Revenues are principally derived from offshore service vessels, which regularly and routinely move from one operating area to another, often to and from offshore operating areas in different continents. Because of this asset mobility, revenues and long-lived assets attributable to the company's international marine operations in any one country are not material.
[3] Included in Sub-Saharan Africa/Europe for the year ended March 31, 2014 is $245.6 million related to vessels acquired through the acquisition of Troms Offshore.
[4] Included in Corporate general and administrative expenses for the year ended March 31, 2014 and 2013 are transaction costs of $3.7 million related to the acquisition of Troms Offshore and a settlement charge of $5.2 million related to the payment of retirement benefits to a former Chief Executive Officer, respectively.
[5] 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.
[6] Included in Corporate are vessels currently under construction which have not yet been assigned to a non-corporate reporting segment. The vessel construction costs will be reported in Corporate until the earlier of the vessels being assigned to a non-corporate reporting segment or the vessels' delivery. At March 31, 2014, 2013 and 2012, $228.9 million, $229.3 million and $249.4 million, respectively, of vessel construction costs are included in Corporate.