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Sale of Merchant Card Servicing Business - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2013
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale of business   $ 0 $ 0 $ 4,750
Gain on sale of business   $ 0 $ 0 $ 3,093
Merchant Card Servicing Business        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Proceeds from sale of business $ 4,800      
Termination fee 1,700      
Gain on sale of business $ 3,100      
Initial term of agreement   10 years