Commitments and Contingencies - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended
	Sep. 30, 2014 site	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Aug. 21, 2007
Conversion of Stock [Line Items]
Reserves to satisfy Federal regulatory requirements	$ 45,146,000	$ 45,146,000		$ 45,146,000		$ 38,359,000
Number of sites leased under non-cancelable operating leases	40
Rent expense under operating leases		1,008,000	1,071,000	3,103,000	3,257,000
Rent expense offset by rent income		54,000	54,000	164,000	162,000
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.	16,139,414	16,139,414		16,139,414		16,076,662	15,814,662
Conversion ratio	0.4206	0.4206		0.4206
Common Class B [Member]
Conversion of Stock [Line Items]
Class B common stock of Visa Inc.	10,214	10,214		10,214
Common Class A [Member]
Conversion of Stock [Line Items]
The value of the Class A shares	$ 213.37	$ 213.37		$ 213.37
Value of unredeemed Class A equivalent shares	$ 917,000	$ 917,000		$ 917,000