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Schedule of Other Current Liabilities (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]    
Taxes payable $ 56,600 $ 56,080
Deferred gain on vessel sales-current 16,701 13,996
Other 652 491
Other current liabilities $ 73,953 $ 70,567