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Acquisitions - Narrative (Details) - USD ($) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 01, 2019 | Jan. 02, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  | $ 49,079 | $ 47,396
Goodwill expected to be deductible for tax purposes | $ 17,900 |  |  |
Percentage of individuals employed by educational institutions |  |  | 80.00% |
Benefit Consultants Group Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Transaction value |  | $ 25,000 |  |
Finite-lived intangible assets acquired |  | 16,200 |  |
Goodwill |  | 10,100 |  |
Goodwill expected to be deductible for tax purposes |  | $ 10,100 |  |
NTA |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Transaction value | 425,900 |  |  |
Goodwill | 19,600 |  |  |
Acquired finite-lived intangible assets, useful lives |  |  | 23 years |
Adjusted earnings consideration | $ 20,900 |  |  |
Minimum | Benefit Consultants Group Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired finite-lived intangible assets, useful lives |  |  | 10 years |
Maximum | Benefit Consultants Group Inc. |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Acquired finite-lived intangible assets, useful lives |  |  | 16 years |

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