Subsequent Events - Additional Information (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended	1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012 NetSpend Holdings Inc	Jul. 01, 2013 Subsequent Event NetSpend Holdings Inc
Subsequent Event [Line Items]
Acquisition date						Jul. 01, 2013
Cash paid for business acquisition						$ 1,400,000,000
Operating revenues	478,443,000	462,651,000	943,439,000	923,813,000	351,300,000
Operating income	$ 95,314,000	$ 92,096,000	$ 170,217,000	$ 176,927,000	$ 33,900,000