Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Escrow deposit	$ 24,200			$ 24,200
Letter of credit facility	600			600
Restricted cash, excluding certificates of deposit	1,800			1,800
Restricted cash	26,600			26,600		$ 1,200
Investments	8,500			8,500
Annual loss limit per person				$ 225
Maximum claims expense				125.00%
Self insurance reserve	1,300			$ 1,300
Options previously granted vesting period				3 years
Award accelerated service period				1 year
Stock-based compensation expense in operating income	1,804		$ 1,942	$ 5,969	$ 5,265
Incentive-Based Compensation Plan
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock-based compensation expense in operating income	100		$ 2,100	$ 2,600	5,100
COVID-19
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Cost method investment impairments	$ 0	$ 800			$ 0