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Schedule of Other Liabilities and Deferred Credits (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Mar. 31, 2015
Other Assets, Accrued Expenses, Other Current Liabilities, And Other Liabilities And Deferred Credits [Abstract]    
Postretirement benefits liability $ 22,411 $ 23,018
Pension liabilities 43,173 41,279
Deferred gain on vessel sales 130,299 136,238
Other 34,749 34,573
Other liabilities and deferred credits $ 230,632 $ 235,108