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Acquisitions - Additional Information (Details) - USD ($)		3 Months Ended						9 Months Ended
	Jan. 14, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2024	Dec. 31, 2022
Business Acquisition [Line Items]
Issuance of stock for acquisition								$ 103,645,000
Revenue		$ 222,915,000			$ 147,472,000			612,031,000	$ 399,898,000
Net income (loss)		$ 29,199,000	$ 28,052,000	$ 22,361,000	$ 32,563,000	$ 7,131,000	$ 12,696,000	$ 79,612,000	$ 52,390,000
Car Offer
Business Acquisition [Line Items]
Business acquisition date	Jan. 14, 2021
Business acquisition, percentage of interest acquired	51.00%	51.00%		51.00%				51.00%
Business acquisition, total consideration	$ 173,155,000
Issuance of stock for acquisition	103,645,000
Payments to acquire business	69,510,000
Retention pool aggregate amount	8,000,000
Retention pool amount granted to employees	6,000,000
Retention pool amount available for issuance to future employees	2,000,000
Acquisition-related costs incurred		$ 2,647,000						$ 2,647,000
Revenue		62,992,000						135,847,000
Net income (loss)		178,000						(8,912,000)
Car Offer | 2022 Call Right | Forecast
Business Acquisition [Line Items]
Business acquisition, option to acquire remaining percentage of interest											25.00%
Business acquisition, option to acquire remaining value of interest										$ 100,000,000
Car Offer | General and Administrative
Business Acquisition [Line Items]
Acquisition-related costs incurred		$ 0						$ 709,000
Car Offer | Class A Common Stock
Business Acquisition [Line Items]
Issuance of stock for acquisition	$ 103,645,000
Business acquisition, stock consideration shares issued	3,115,282
Business acquisition, share price	$ 22.51

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