Summary of Fair Value of Total Consideration Transferred for Payment Solution Controlling and Noncontrolling Interest, Total Fair Value of Net Identifiable Liabilities Acquired and Resulting Goodwill (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011		Dec. 31, 2010	Jan. 30, 2012 payment solution AG
Business Acquisition [Line Items]
Fair value of common stock					$ 3,041
Fair value of total consideration transferred					3,041
Fair value of noncontrolling interest					2,131
Fair value of controlling and noncontrolling interest					5,172
Fair value of net identifiable liabilities acquired					7,786
Goodwill	$ 48,950	$ 58,404	[1]	$ 47,126	$ 12,958

[1] The condensed consolidated balance sheet has been derived from the audited consolidated financial statements at December 31, 2011 but does not include all the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements.