Description of the Business and Basis of Presentation - Additional Information (Details) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
	Jul. 27, 2020 USD ($) $ / shares shares	Sep. 30, 2021 Employee $ / shares shares	Sep. 30, 2020 $ / shares shares	Sep. 30, 2021 Employee Office Segment $ / shares shares	Sep. 30, 2020 $ / shares shares
Description Of Business And Basis Of Presentation [Line Items]
Entity formation, month and year				2013-11
Number of offices in which entity operates | Office				80
Entity number of employees | Employee		2,300		2,300
Number of operating segments | Segment				3
Common stock issued, shares | shares		417,656	15,728,376	1,593,317	16,523,015
Share price | $ / shares		$ 39.83	$ 16.36	$ 39.83	$ 16.36
IPO
Description Of Business And Basis Of Presentation [Line Items]
Common stock issued, shares | shares	11,500,000
Share price | $ / shares	$ 15.00
Net proceeds from sale of common stock | $	$ 161.3
Underwriting discounts | $	11.2
Deferred offset | $	$ 4.4
Underwriters
Description Of Business And Basis Of Presentation [Line Items]
Common stock issued, shares | shares	1,500,000