Acquisitions - Preliminary Purchase Price Allocation of PAY.ON (Detail) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 915,657	$ 913,261
PAY.ON
Business Acquisition [Line Items]
Cash and cash equivalents	1,627
Receivables, net of allowance	2,674
Other current assets	511
Total current assets acquired	4,812
Property and equipment	332
Goodwill	140,680
Other noncurrent assets	7
Total assets acquired	203,999
Accounts payable	1,058
Employee compensation	681
Other current liabilities	840
Total current liabilities acquired	2,579
Deferred income taxes	15,047
Total liabilities acquired	17,626
Net assets acquired	$ 186,373
Software | PAY.ON
Business Acquisition [Line Items]
Acquired intangible assets, weighted-average useful lives	5 years
Amortizable intangible assets	$ 34,150
Customer relationships | PAY.ON
Business Acquisition [Line Items]
Acquired intangible assets, weighted-average useful lives	15 years
Amortizable intangible assets	$ 21,718
Trademarks | PAY.ON
Business Acquisition [Line Items]
Acquired intangible assets, weighted-average useful lives	5 years
Amortizable intangible assets	$ 2,300