Acquisitions - Additional Information (Detail)					0 Months Ended		1 Months Ended
	Sep. 30, 2013 USD ($)	Dec. 31, 2012 USD ($)		Dec. 31, 2011 USD ($)	Jul. 02, 2013 Payment Solution AG USD ($)	Jul. 02, 2013 Payment Solution AG EUR (€)	Apr. 02, 2012 Payment Solution AG USD ($)	Jan. 30, 2012 Payment Solution AG USD ($)
Business Acquisition [Line Items]
Percentage of outstanding shares acquired					93.70%	93.70%	82.50%	58.80%
Business acquisition, issued share							548,114	1,357,758
Business acquisition, percentage of outstanding common stock issued								2.40%
Business acquisition, issued share value					$ 200,000	€ 165,000	$ 1,200,000	$ 3,000,000
Goodwill	$ 22,723,000	$ 45,270,000	[1]	$ 59,044,000				$ 13,255,000

[1] The condensed consolidated balance sheet has been derived from the audited consolidated financial statements at December 31, 2012 but does not include all the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.