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Schedule of Other Liabilities and Deferred Credits (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Other Assets, Accrued Expenses, Other Current Liabilities, And Other Liabilities And Deferred Credits [Abstract]    
Postretirement benefits liability $ 23,185 $ 27,681
Pension liabilities 35,234 37,096
Deferred gain on vessel sales 85,316 39,568
Other 35,469 34,729
Other liabilities and deferred credits $ 179,204 $ 139,074