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Acquisition Activity - Additional Information (Detail)
 3 Months Ended 9 Months Ended
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 15, 2016
USD ($)
employee
Sep. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Capital Unit [Line Items]              
Cash consideration at closing           $ 0 $ 17,000,000
Higher One, Inc.'s Account Student Checking and Refund Management Disbursement Services Business              
Capital Unit [Line Items]              
Number of employees hired (employee) | employee     225        
Aggregate guaranteed payments     $ 42,000,000        
Transaction cash consideration $ 37,000,000   37,000,000        
Cash consideration at closing     17,000,000        
Business acquisition payables     20,000,000        
Payments for services under transition services agreement     $ 5,000,000        
Period following the closing for potential additional payments     3 years        
Revenue amount to trigger additional payments     $ 75,000,000        
Possible payment as a percent of amount that exceeds revenue     35.00%        
Payables to Higher One 10,000,000 $ 20,000,000          
Goodwill recognized $ 5,259,000   $ 4,300,000        
Increase in goodwill         $ 1,000,000    
Depreciation, Depletion and Amortization, Nonproduction       $ 3,500,000   $ 4,300,000  
Higher One, Inc.'s Account Student Checking and Refund Management Disbursement Services Business | Developed software              
Capital Unit [Line Items]              
Useful life     10 years        
Higher One, Inc.'s Account Student Checking and Refund Management Disbursement Services Business | Other Intangible Assets | Minimum              
Capital Unit [Line Items]              
Useful life     4 years        
Higher One, Inc.'s Account Student Checking and Refund Management Disbursement Services Business | Other Intangible Assets | Maximum              
Capital Unit [Line Items]              
Useful life     20 years        
Higher One, Inc.'s Account Student Checking and Refund Management Disbursement Services Business | First Anniversary of Closing              
Capital Unit [Line Items]              
Business acquisition payables     $ 10,000,000 $ 10,000,000      
Payables to Higher One     10,000,000        
Higher One, Inc.'s Account Student Checking and Refund Management Disbursement Services Business | Second Anniversary of Closing              
Capital Unit [Line Items]              
Business acquisition payables     10,000,000        
Payables to Higher One     $ 10,000,000