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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 |  |  |  |  |

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