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Schedule of Other Current Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Mar. 31, 2015
Other Assets, Accrued Expenses, Other Current Liabilities, And Other Liabilities And Deferred Credits [Abstract]    
Taxes payable $ 50,243 $ 56,620
Deferred gain on vessel sales - current 24,928 25,057
Other 359 784
Other current liabilities 75,530 82,461
Other Current Liabilities    
Other Assets, Accrued Expenses, Other Current Liabilities, And Other Liabilities And Deferred Credits [Abstract]    
Other current liabilities $ 75,530 $ 82,461