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Acquisition Activity - Narrative (Detail)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jun. 15, 2016
USD ($)
employee
Dec. 31, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Capital Unit [Line Items]                
Payments at closing           $ 0 $ 17,000 $ 0
Higher One, Inc's Disbursements Business                
Capital Unit [Line Items]                
Number of employees hired (employee) | employee     225          
Total consideration for Higher One     $ 42,000          
Cash consideration for Higher One     37,000     37,000    
Payments at closing     17,000          
Future consideration $ 15,000   20,000          
Consideration for transition services     $ 5,000          
Period after closing for required additional payments     3 years          
Revenue amount to trigger additional payments     $ 75,000          
Payment amount as a percent of revenue exceeding $75 million     35.00%          
Payables to Higher One     $ 5,000     5,000 $ 20,000  
Goodwill 5,259     $ 5,259   5,259    
Increase in goodwill   $ 1,000            
Higher One, Inc's Disbursements Business | Maximum                
Capital Unit [Line Items]                
Future consideration $ 20,000              
Higher One, Inc's Disbursements Business | Developed software                
Capital Unit [Line Items]                
Intangible assets useful life     10 years          
Higher One, Inc's Disbursements Business | Other intangible assets | Minimum                
Capital Unit [Line Items]                
Intangible assets useful life     4 years          
Higher One, Inc's Disbursements Business | Other intangible assets | Maximum                
Capital Unit [Line Items]                
Intangible assets useful life     20 years          
Higher One, Inc's Disbursements Business | First Anniversary of Closing                
Capital Unit [Line Items]                
Future consideration     $ 10,000 $ 5,000 $ 10,000      
Higher One, Inc's Disbursements Business | Second Anniversary of Closing                
Capital Unit [Line Items]                
Future consideration     10,000          
Payables to Higher One     10,000     $ 5,000    
Preliminary | Higher One, Inc's Disbursements Business                
Capital Unit [Line Items]                
Goodwill     $ 4,293