Acquisition - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended		1 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Feb. 28, 2013 Xtrakter Limited [Member]	Sep. 30, 2013 Xtrakter Limited [Member]
Business Acquisition [Line Items]
Aggregate business acquisition purchase price			$ 37,827,000		$ 37,827,000
Professional services						1,600,000
Revenue	61,133,000	46,402,000	178,291,000	142,262,000		12,800,000
Net income						$ 100,000