Schedule of Other Current Assets (Detail) - USD ($) $ in Thousands		Sep. 30, 2016	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	[1]	$ 13,474	$ 30,285
Deposits - general		8,656	8,076
Prepaid expenses		9,744	6,394
Total other current assets		$ 31,874	$ 44,755

[1] Refer to Note (8) for additional discussion regarding the vessels under construction with option agreements.