Significant Components of Contract Acquisition Costs, Net of Accumulated Amortization (Detail) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Acquired Finite-Lived Intangible Assets [Line Items]
Conversion costs, net of accumulated amortization of $101.3 million and $90.9 million at 2011 and 2010, respectively	$ 89,540	$ 80,521
Payments for processing rights, net of accumulated amortization of $179.2 million and $169.8 million at 2011 and 2010, respectively	77,910	85,730
Total	$ 167,450	$ 166,251