Summary of Transaction Stock Options Issued Pursuant to Stock Incentive Plans (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Shares
Outstanding, Beginning Balance	5,282,693	7,408,821	8,905,746
Exercised	(1,144,273)	(2,036,558)	(2,478,183)
Cancelled	(394,265)	(116,702)	(225,474)
Outstanding, Ending Balance	5,799,076	5,282,693	7,408,821
Number of Shares Exercisable, Ending Balance	3,744,383
Weighted-Average Exercise Price
Beginning Balance	$ 12.06	$ 11.02	$ 9.05
Exercised	10.62	8.08	7.81
Cancelled	19.06	17.80	12.79
Ending Balance	14.37	$ 12.06	$ 11.02
Weighted-Average Exercise Price Exercisable, Ending Balance	$ 11.67
Weighted-Average Remaining Contractual Term (Years)
Weighted-Average Remaining Contractual Term (Years), Outstanding as of end of period	6 years 3 months 7 days
Weighted-Average Remaining Contractual Term (Years), Exercisable as of end of period	4 years 9 months 26 days
Aggregate Intrinsic Value of In-the-Money Options
Aggregate Intrinsic Value of In-the-Money Options, Outstanding as of end of period	$ 40,786,575
Aggregate Intrinsic Value of In-the-Money Options, Exercisable as of end of period	$ 36,424,252
Online Resources Corporation
Number of Shares
Outstanding, Beginning Balance	46,512	62,445
Transaction stock options converted upon acquisition of ORCC			112,404
Exercised	(1,926)	(909)	(15,501)
Cancelled	(23,550)	(15,024)	(34,458)
Outstanding, Ending Balance	21,036	46,512	62,445
Number of Shares Exercisable, Ending Balance	21,036
Weighted-Average Exercise Price
Beginning Balance	$ 36.73	$ 35.03
Transaction stock options converted upon acquisition of ORCC			$ 30.64
Exercised	13.92	13.92	13.92
Cancelled	44.83	31.03	30.21
Ending Balance	29.76	$ 36.73	$ 35.03
Weighted-Average Exercise Price Exercisable, Ending Balance	$ 29.76
Weighted-Average Remaining Contractual Term (Years)
Weighted-Average Remaining Contractual Term (Years), Outstanding as of end of period	1 year 8 months 5 days
Weighted-Average Remaining Contractual Term (Years), Exercisable as of end of period	1 year 8 months 5 days
Aggregate Intrinsic Value of In-the-Money Options
Aggregate Intrinsic Value of In-the-Money Options, Outstanding as of end of period	$ 37,587
Aggregate Intrinsic Value of In-the-Money Options, Exercisable as of end of period	$ 37,587