Discontinued Operations - Additional Information (Detail) (USD $)	12 Months Ended		0 Months Ended
	Apr. 30, 2014	Jun. 04, 2014 Subsequent event	Jun. 12, 2012 PowerReviews
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Business acquisition total consideration			$ 150,754,000
Definitive agreement to divest PowerReviews, expected cash proceed		30,000,000
Estimated pro forma loss on disposal of discontinued operations, net of taxes	$ (9,192,000)