Significant Accounting Policies - Additional Information (Detail) (USD $)	9 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Accounting Policies [Abstract]
Deferred merchant payables	$ 28,596,000	$ 1,303,000
Operating cash flow generated	12,800,000
Payable balance acquired with business acquisition	$ 14,500,000