Acquisitions - Additional Information (Detail) (USD $)	3 Months Ended	9 Months Ended			3 Months Ended
	Mar. 31, 2012	Jun. 30, 2012	Dec. 31, 2011	Dec. 30, 2011	Dec. 31, 2011 Completed technology	Dec. 31, 2011 Trade Name
Business Acquisition [Line Items]
Business acquisition, cash payment				$ 8,700,000
Business acquisition deferred cash payable				500,000
Cash flow discount rate used to determine fair value attributed to completed technologies					25.00%
Useful life of intangible assets acquired					6 years	6 years
Business acquisition, transaction costs			105,000
In-process research and development	$ 3,000,000	$ 3,026,000