Schedule of Other Current Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Other Current Assets, Other Assets Accrued Expenses Other Current Liabilities and other Non current liabilities and Deferred Credits [Abstract]
Deposits on vessel construction options	$ 50	$ 30,285
Deposits - general	6,945	8,076
Prepaid expenses	11,414	6,394
Total other current assets	$ 18,409	$ 44,755