Commitments and Contingencies - Additional Information (Detail) (USD $)	3 Months Ended
	Mar. 31, 2015 site	Mar. 31, 2014	Dec. 31, 2014	Aug. 21, 2007
Conversion of Stock [Line Items]
Reserves to satisfy Federal regulatory requirements	$ 64,997,000		$ 57,616,000
Number of sites leased under non-cancelable operating leases	47
Rent expense under operating leases	959,000	755,000
Rent expense offset by rent income	48,000	54,000
Commitment expiration date	One year or less or other termination clauses and may require payment of a fee.
Letters of credit, issue period	One year or less
Overdraft privilege receivable criteria	All holders of such accounts who bring their accounts to a positive balance at least once every thirty days receive the overdraft privilege.
Class B common stock of Visa Inc.	22,740,503		22,714,964	15,814,662
Conversion ratio	1.648265
Common Class B [Member]
Conversion of Stock [Line Items]
Class B common stock of Visa Inc.	13,396
Common Class A [Member]
Conversion of Stock [Line Items]
The value of the Class A shares	$ 65.41
Value of unredeemed Class A equivalent shares	$ 1,444,000