Segment Information - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Segment	Sep. 30, 2012
Segment Reporting Information [Line Items]
Number of reporting segments			2
Revenue	$ 16,071	$ 7,998	$ 41,521	$ 17,609
Dispositions
Segment Reporting Information [Line Items]
Revenue
Outside United States
Segment Reporting Information [Line Items]
Revenue	$ 600	$ 200	$ 1,800	$ 700
Go Industry | Dispositions
Segment Reporting Information [Line Items]
Segments disposal date			Jul. 05, 2012
Investorforce | Dispositions
Segment Reporting Information [Line Items]
Segments disposal date			Jan. 29, 2013
Channel Intelligence | Dispositions
Segment Reporting Information [Line Items]
Segments disposal date			Feb. 20, 2013