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Schedule of Other Liabilities and Deferred Credits (Detail) - USD ($)
$ in Thousands
Mar. 31, 2017
Mar. 31, 2016
Deferred Credits and Other Liabilities [Abstract]    
Postretirement benefits liability $ 4,394 $ 4,755
Pension liabilities 40,339 41,690
Deferred gain on vessel sales 88,923 112,721
Other 21,049 22,380
Other liabilities and deferred credits $ 154,705 $ 181,546