Significant Components of Contract Acquisition Costs (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Acquired Finite-Lived Intangible Assets [Line Items]
Conversion costs, net of accumulated amortization of $156.5 million and $138.7 million as of 2015 and 2014, respectively	$ 161,615	$ 159,339
Payments for processing rights, net of accumulated amortization of $148.1 million and $137.4 million as of 2015 and 2014, respectively	91,054	76,966
Total	$ 252,669	$ 236,305