Summary of Other Income Expense Net (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Components of Other Income (Expense) [Line Items]
Foreign exchange transaction losses	$ 1,887	$ 1,483	$ 732
Insurance recoveries	(1,800)
Secondary offering fees			615
Other	829	1,585	830
Total	$ 916	$ 3,068	$ 2,177