Schedule of Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Income Tax Disclosure [Abstract]
Balance at April 1,	$ 19,698	$ 20,066	$ 14,868
Additions based on tax positions related to the current year	1,223	1,342	4,393
Additions based on tax positions related to prior years			2,217
Settlement and lapse of statute of limitations	(3,273)	(1,710)	(1,412)
Balance at March 31,	$ 17,648	$ 19,698	$ 20,066