Commitments and Contingencies - Additional Information (Detail)		3 Months Ended		9 Months Ended
	Oct. 26, 2015 USD ($)	Sep. 30, 2015 USD ($) $ / shares shares	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) site $ / shares shares	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) shares	Aug. 21, 2007 shares
Conversion of Stock [Line Items]
Reserves to satisfy Federal regulatory requirements		$ 68,082,000		$ 68,082,000		$ 57,616,000
Number of sites leased under non-cancelable operating leases | site				40
Rent expense under operating leases		1,049,000	$ 697,000	$ 2,992,000	$ 2,186,000
Rent expense offset by rent income		$ 57,000	$ 55,000	$ 161,000	$ 164,000
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. | shares		22,764,295		22,764,295		22,714,964	15,814,662
Conversion ratio		1.648265		1.648265
Subsequent Event [Member]
Conversion of Stock [Line Items]
Damages awarded value	$ 250,000
Common Class B [Member]
Conversion of Stock [Line Items]
Class B common stock of Visa Inc. | shares		13,396		13,396
Common Class A [Member]
Conversion of Stock [Line Items]
The value of the Class A shares | $ / shares		$ 69.66		$ 69.66
Value of unredeemed Class A equivalent shares		$ 1,538,000		$ 1,538,000