Business Combinations - Additional Information (Detail) (Longboard Media, Inc, USD $) Share data in Millions, unless otherwise specified	1 Months Ended			3 Months Ended					1 Months Ended
	Nov. 05, 2012	Oct. 31, 2013 Contingent Consideration Subject to Certain Requirements	Apr. 30, 2013 Contingent Consideration Subject to Certain Requirements	Oct. 31, 2013 Selling, General and Administrative Expenses Scenario, Before Adjustment	Oct. 31, 2013 Selling, General and Administrative Expenses Contingent Consideration Subject to Certain Requirements	Nov. 05, 2012 Key individuals	Oct. 31, 2013 Accrued Expenses and Other Current Liabilities Scenario, Before Adjustment	Apr. 30, 2013 Accrued Expenses and Other Current Liabilities Scenario, Before Adjustment	Nov. 05, 2012 Common Stock
Business Acquisition [Line Items]
Cash paid in business acquisition	$ 26,900,000
Shares of common stock issued in business acquisition									0.5
Contingent consideration acquisition fair value	4,300,000	0	1,500,000			2,000,000	0	3,300,000
Fair value offset to operating expenses				$ (3,300,000)	$ (1,000,000)