Income Taxes - Additional Information (Detail) (USD $)	12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Income taxes paid	$ 19,528,000	$ 20,791,000	$ 9,663,000
Prepaid expenses and taxes	5,758,000	1,346,000
Recognizes interest and penalties related to uncertain tax positions	57,000	(173,000)	80,000
Accrued interest and penalties related to uncertain tax positions	$ 140,000	$ 83,000	$ 257,000
Period of unrecognized tax benefits	12 months