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Segment Information, Geographical Data and Major Customers (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Dec. 31, 2013
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting Information [Line Items]                        
Vessel revenues                   $ 955,400 $ 1,468,358 $ 1,418,461
Other operating revenues                   23,662 27,159 16,642
Total revenues $ 184,174 $ 218,191 $ 271,923 $ 304,774 $ 324,762 $ 387,554 $ 397,524 $ 385,677   979,062 1,495,517 1,435,103
Operating profit (loss)                   69,574 285,934 296,878
General and administrative expenses                   (153,811) (189,819) (187,976)
Depreciation and amortization                   182,309 175,204 167,480
Corporate expenses                   (40,238) (44,635) (50,776)
Gain on asset dispositions, net 6,692 5,883 6,111 7,351 10,704 4,699 4,500 3,893   26,037 23,796 21,063
Asset impairment                   (117,311) (14,525) (9,341)
Goodwill impairment           (283,699)     $ (56,283)   (283,699) [1] (56,283)
Restructuring charge     (7,600)   (4,100)         (7,586) (4,052)  
Operating income (loss) (56,569) [2] $ (9,400) [2] $ (17,644) [2] $ 14,089 [2] 25,672 [2] $ (213,580) [2] $ 84,723 [2] $ 66,004 [2]   (69,524) (37,181) 201,541
Foreign exchange gain / (loss)                   (5,403) 8,678 1,541
Equity in net earnings / (losses) of unconsolidated companies                   (13,581) 10,179 15,801
Interest income and other, net                   2,703 1,927 2,123
Loss on early extinguishment of debt                       (4,144)
Interest and other debt costs                   (53,752) (50,029) (43,814)
Earnings (loss) before income taxes                   (139,557) (66,426) 173,048
Additions to properties and equipment                   194,485 366,563 806,484
Assets 4,990,547       4,756,162         4,990,547 4,756,162 4,885,829
Investments in, at equity, and advances to unconsolidated companies 37,502       65,844         37,502 65,844 63,928
Americas                        
Segment Reporting Information [Line Items]                        
Goodwill impairment                     (114,237)  
Asia/Pacific                        
Segment Reporting Information [Line Items]                        
Goodwill impairment                 $ (56,300)      
Sub-Saharan Africa/Europe                        
Segment Reporting Information [Line Items]                        
Goodwill impairment                     (169,462)  
All Other Segments                        
Segment Reporting Information [Line Items]                        
Operating profit (loss)                   (4,564) (8,022) (1,930)
Depreciation and amortization                   5,721 3,973 295
Additions to properties and equipment                   10 18,571 31,841
Assets 42,191       49,554         42,191 49,554 31,545
Assets Before Corporate Assets                        
Segment Reporting Information [Line Items]                        
Assets 4,063,801       4,302,945         4,063,801 4,302,945 4,467,470
Assets Before Equity Method Investments                        
Segment Reporting Information [Line Items]                        
Assets 4,101,303       4,368,789         4,101,303 4,368,789 4,531,398
Operating Segments                        
Segment Reporting Information [Line Items]                        
Operating profit (loss)                   74,138 293,956 298,808
Depreciation and amortization                   170,428 167,217 164,112
Additions to properties and equipment                   56,813 223,581 599,410
Assets 4,021,610       4,253,391         4,021,610 4,253,391 4,435,925
Operating Segments | Americas                        
Segment Reporting Information [Line Items]                        
Vessel revenues                   342,995 505,699 410,731
Operating profit (loss)                   52,966 122,988 90,936
Depreciation and amortization                   48,474 47,682 43,298
Additions to properties and equipment                   51,303 94,137 99,798
Assets [3] 1,101,699       1,016,133         1,101,699 1,016,133 1,017,736
Operating Segments | Asia/Pacific                        
Segment Reporting Information [Line Items]                        
Vessel revenues                   89,045 150,820 154,618
Operating profit (loss)                   (1,687) 11,541 29,044
Depreciation and amortization                   22,386 18,383 17,174
Additions to properties and equipment                   1,917 91,497 2,586
Assets [3] 514,948       506,265         514,948 506,265 421,379
Operating Segments | Middle East/North Africa                        
Segment Reporting Information [Line Items]                        
Vessel revenues                   168,471 205,787 186,524
Operating profit (loss)                   27,349 37,258 42,736
Depreciation and amortization                   28,150 27,538 24,441
Additions to properties and equipment                   1,732 1,842 8,042
Assets [3] 582,281       666,983         582,281 666,983 613,303
Operating Segments | Sub-Saharan Africa/Europe                        
Segment Reporting Information [Line Items]                        
Vessel revenues                   354,889 606,052 666,588
Operating profit (loss)                   (4,490) 122,169 136,092
Depreciation and amortization                   71,418 73,614 79,199
Additions to properties and equipment [4]                   1,861 36,105 488,984
Assets [3] 1,822,682       2,064,010         1,822,682 2,064,010 2,383,507
Corporate                        
Segment Reporting Information [Line Items]                        
General and administrative expenses [5]                   (34,078) (40,621) (47,703)
Depreciation and amortization                   6,160 4,014 3,073
Additions to properties and equipment [6]                   137,662 124,411 175,233
Assets [7] $ 889,244       $ 387,373         $ 889,244 $ 387,373 $ 354,431
[1] The total carrying amount of goodwill at March 31, 2014 is net of accumulated impairment charges $30.9 million and $56.3 million related to the Middle East/North Africa and Asia/Pacific segments, respectively.
[2] 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 2016 and 2015 and gain on asset dispositions, net, by quarter for fiscal 2016 and 2015, are as follows:
[3] 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.
[4] 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.
[5] Included in Corporate general and administrative expenses for the year ended March 31, 2014 are transaction costs of $3.7 million related to the acquisition of Troms Offshore.
[6] 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.
[7] 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, 2016, 2015 and 2014, $136.8 million, $235.2 million and $228.9 million, respectively, of vessel construction costs are included in Corporate.