Guarantees and Contingent Liabilities - Additional Information (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Airline Processing Arrangements [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Value of airline tickets purchased to deliver at future date through card transactions	$ 11,900.0
Representation and Warranty [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Representation and warranty reserve	10.0	$ 10.0
Unresolved representation and warranty claims from GSEs	17.0	$ 15.0
Escrow Deposits Letters of Credit Indemnities [Member] | Airline Processing Arrangements [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Company held collateral in escrow deposits, letters of credit and indemnities from financial institutions and liens on various assets	1.1
Merchant Escrow Deposits [Member] | Airline Processing Arrangements [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Company held collateral in escrow deposits, letters of credit and indemnities from financial institutions and liens on various assets	$ 50.0
Visa Class B Shares [Member]
Guarantees And Contingent Liabilities (Textual) [Abstract]
Number of shares sold	0.4
Remaining shares held by the Company	0.9