Acquisition - Additional Information (Detail) (USD $)	12 Months Ended			1 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 28, 2013 Xtrakter Limited [Member]	Dec. 31, 2013 Xtrakter Limited [Member]
Business Acquisition [Line Items]
Aggregate business acquisition purchase price	$ 37,827,000			$ 37,800,000
Professional services					1,600,000
Revenue	238,733,000	190,840,000	171,874,000		18,400,000
Net income					$ 900,000