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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

X

- Definition

The amount of identifiable intangible assets recognized as of the acquisition date.

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