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Subsequent Event (Subsequent Event - Additional Information) (Detail) - Subsequent Event
$ / shares in Units, shares in Thousands, $ in Billions
6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Vantiv, Inc. | Class A  
Subsequent Event  
Exchange of Common Stock in Vantiv, Inc. 19,790
Closing Share Price of Vantiv, Inc. Class A Common Stock on August 4, 2017 | $ / shares $ 64.04
Vantiv Holding, LLC  
Subsequent Event  
Pretax Gain Expected To Be Recognized | $ $ 1.0
Equity Method Investment, Ownership Percentage 8.60%
Vantiv Holding, LLC | Class B  
Subsequent Event  
Exchange of Units in Vantiv Holding, LLC 19,790
Ownership of Shares 15,300
Vantiv, Inc. and Vantiv Holding, LLC  
Subsequent Event  
Subsequent Event Date Aug. 07, 2017