Segment Reporting, including Geographic Area Data and Major Customers - Additional Information (Detail) (USD $)	12 Months Ended
Dec. 31, 2011 Customer	Dec. 31, 2010 Customer	Dec. 26, 2012 ProPay	Aug. 08, 2012 Central Payment Co., LLC
Segment Reporting Information [Line Items]
Business acquisition, cash paid			$ 123,700,000	$ 66,000,000
Business acquisition percent of acquisition				60.00%
Entity-wide revenue, major customer, number	1	1
Entity-wide revenue, major customer, amount	$ 210,900,000	$ 221,000,000
Percentage of total revenues, by major customer	11.70%	12.90%

Amount of cash paid to acquire the entity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141R

-Paragraph 68

-Subparagraph f(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 51

-Subparagraph d

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Name:	us-gaap_BusinessAcquisitionCostOfAcquiredEntityCashPaid
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant