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Schedule of Other Liabilities and Deferred Credits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Mar. 31, 2016
Deferred Credits and Other Liabilities [Abstract]    
Postretirement benefits liability $ 311 $ 4,755
Pension liabilities 40,289 41,690
Deferred gain on vessel sales 94,873 112,721
Other 23,764 22,380
Total other liabilities and deferred credits $ 159,237 $ 181,546