Comprehensive Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Other Comprehensive Income (Loss) [Line Items]
Net income	$ 1,693	$ 3,171	$ 7,480	$ 8,271
Foreign currency translation adjustment			427
Comprehensive income	$ 1,693	$ 3,171	$ 7,907	$ 8,271