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Goodwill and Intangible Assets, net - Narrative (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 01, 2020 | Jun. 30, 2019 | Dec. 31, 2020
Goodwill [Line Items] |  |  |
Goodwill impairment |  |  | $ 5,625
Impairment of infinite lived intangible assets |  |  | 767
Trade names |  |  |
Goodwill [Line Items] |  |  |
Impairment of infinite lived intangible assets |  |  | 767
Benefit Consultants Group Inc. |  |  |
Goodwill [Line Items] |  |  |
Goodwill impairment | $ 5,600 |  |
Acquired finite-lived intangible assets |  |  | 14,100
Benefit Consultants Group Inc. | Trade names |  |  |
Goodwill [Line Items] |  |  |
Impairment of infinite lived intangible assets | 800 |  |
Benefit Consultants Group Inc. | Value of business acquired |  |  |
Goodwill [Line Items] |  |  |
Impairment of finite lived intangible assets | 3,600 |  |
NTA |  |  |
Goodwill [Line Items] |  |  |
Acquired finite-lived intangible assets |  |  | 160,400
Retirement |  |  |
Goodwill [Line Items] |  |  |
Goodwill impairment |  | $ 28,000 | $ 5,625
Retirement | Benefit Consultants Group Inc. |  |  |
Goodwill [Line Items] |  |  |
Goodwill impairment | $ 5,600 |  |

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