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Goodwill and Intangible Assets, net - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |  |  |
Other expense - goodwill impairment |  | $ 28,025 | $ 0 | $ 0
Retirement |  |  |  |
Goodwill [Line Items] |  |  |  |
Other expense - goodwill impairment | $ 28,000 | 28,025 |  |
Benefit Consultants Group Inc. |  |  |  |
Goodwill [Line Items] |  |  |  |
Acquired finite-lived intangible assets |  | 14,100 |  |
NTA |  |  |  |
Goodwill [Line Items] |  |  |  |
Acquired finite-lived intangible assets |  | $ 160,400 |  |

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