Commitments and Contingencies (Legal Proceedings) - Additional Information (Details) - USD ($) $ in Thousands			12 Months Ended
	Jun. 24, 2021	Dec. 19, 2016	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Commitments And Contingencies [Line Items]
Loss related to legal settlement			$ 30,468	$ 0	$ 0
CBIZ Operations and former employee of CBIZ MMP
Commitments And Contingencies [Line Items]
Amount of damages sought (up to)		$ 177,000
Total transaction price		$ 200,000
University of Pittsburgh Medical Center
Commitments And Contingencies [Line Items]
Settlement amount awarded to other party	$ 41,500
Loss related to legal settlement	$ 30,500