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Schedule of Other Liabilities and Deferred Credits (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Mar. 31, 2014
Other Assets, Accrued Expenses, Other Current Liabilities, And Other Liabilities And Deferred Credits [Abstract]    
Postretirement benefits liability $ 21,680 $ 23,185
Pension liabilities 34,759 35,234
Deferred gain on vessel sales 95,599 85,316
Other 36,656 35,469
Other liabilities and deferred credits $ 188,694 $ 179,204