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Legal and Regulatory Proceedings (Legal and Regulatory Proceedings - Additional Information) (Detail)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2013
Sep. 30, 2013
USD ($)
Mar. 31, 2013
USD ($)
Sep. 30, 2012
USD ($)
Mar. 31, 2012
USD ($)
Loss Contingencies              
Amount in excess of amounts reserved   $ 43.0          
LitigationSettlementAmount $ 6.0            
APR Percentage Allegedly Misleading           120.00%  
Number Of Putative Class Actions Filed     4        
Damages Claimed By Defendant       $ 1.5      
Damages Claimed By Plaintiff       $ 50.0   $ 70.0 $ 40.0
Federal Lawsuits              
Loss Contingencies              
Number of merchants requesting exclusion   460          
Class Action Settlement              
Loss Contingencies              
Number of merchants requesting exclusion   8,000          
Percentage of escrow funds returned to defendants   25.00%          
Escrow Deposit         $ 46.0