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Schedule of Segment Reporting Information, Revenue by Vessel Class (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues $ 381,510 $ 331,630
Americas Fleet Deepwater vessels
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 82,282 55,032
Percentage of revenue 21.00% 17.00%
Americas Fleet Towing-Supply/supply
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 29,517 27,670
Percentage of revenue 8.00% 8.00%
Americas Fleet Other
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 8,184 7,542
Percentage of revenue 2.00% 2.00%
Americas Fleet
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 119,983 90,244
Percentage of revenue 31.00% 27.00%
Asia and Pacific Fleet Deepwater vessels
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 24,242 24,292
Percentage of revenue 7.00% 7.00%
Asia/Pacific Fleet Towing-Supply/supply
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 15,037 17,722
Percentage of revenue 4.00% 6.00%
Asia and Pacific Fleet Other
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 970 942
Asia and Pacific Fleet Other | Maximum
    
Segment and Geographic Distribution of Operations [Line Items]    
Percentage of revenue 1.00% 1.00%
Asia/Pacific Fleet
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 40,249 42,956
Percentage of revenue 11.00% 13.00%
Middle East/North Africa Fleet Deepwater vessels
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 19,467 15,852
Percentage of revenue 5.00% 5.00%
Middle East/North Africa Fleet Towing-Supply/supply
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 35,279 24,497
Percentage of revenue 9.00% 7.00%
Middle East and North Africa Fleet Other
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 793 864
Middle East and North Africa Fleet Other | Maximum
    
Segment and Geographic Distribution of Operations [Line Items]    
Percentage of revenue 1.00% 1.00%
Middle East/North Africa
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 55,539 41,213
Percentage of revenue 15.00% 13.00%
Sub-Saharan Africa/Europe Fleet Deepwater vessels
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 91,691 87,251
Percentage of revenue 24.00% 26.00%
Sub-Saharan Africa/Europe Fleet Towing-Supply/supply
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 55,436 54,860
Percentage of revenue 14.00% 17.00%
Sub Saharan Africa And Europe Fleet Other
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 18,612 15,106
Percentage of revenue 5.00% 4.00%
Sub-Saharan Africa/Europe Fleet
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 165,739 157,217
Percentage of revenue 43.00% 47.00%
Worldwide Fleet Deepwater vessels
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 217,682 182,427
Percentage of revenue 57.00% 55.00%
Worldwide Fleet Towing-Supply/supply
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 135,269 124,749
Percentage of revenue 35.00% 38.00%
Worldwide Fleet Other
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues 28,559 24,454
Percentage of revenue 8.00% 7.00%
Worldwide Fleet
    
Segment and Geographic Distribution of Operations [Line Items]    
Vessel revenues $ 381,510 $ 331,630
Percentage of revenue 100.00% 100.00%