Related Party Transactions - Additional Information (Details) - USD ($)				3 Months Ended			9 Months Ended		12 Months Ended
	Jan. 01, 2021	Apr. 01, 2020	May 01, 2018	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jun. 30, 2021
Related Party Transaction [Line Items]
Reimbursable expenses							$ 700,000		$ 600,000
Intercompany services				$ 2,595,000	$ 2,627,000		7,856,000	$ 5,177,000
Accounts receivable related parties				1,700,000			1,700,000		2,600,000
Accounts receivable				1,700,000			1,700,000		2,600,000
Management And Advisory Fees				38,145,000	15,381,000		104,901,000	42,682,000
Acquisition Partners, LLC
Related Party Transaction [Line Items]
Ownership percentage										24.90%
Accounts receivable related parties				1,000,000.0			1,000,000.0		2,000,000.0
Accounts receivable				1,000,000.0			1,000,000.0		$ 2,000,000.0
210/P10 acquisition partners LLC
Related Party Transaction [Line Items]
Administration and consulting services			$ 31,700
Administration and consulting services fee and reimbursable expense							0	500,000
Reimbursable expenses			$ 18,800
210 Capital LLC
Related Party Transaction [Line Items]
Rent expense	$ 20,300						200,000	0
Lease expiration date	Dec. 31, 2029
RCP 2
Related Party Transaction [Line Items]
Intercompany services							2,600,000	1,700,000
Keystone Capital XXX, LLC
Related Party Transaction [Line Items]
Management fee expense		$ 250,000					800,000	500,000
Enhanced Capital Group LLC
Related Party Transaction [Line Items]
Advisory Fees	$ 76,000,000.0
Advisory fee term	7 years
Enhanced Capital Holding Inc.
Related Party Transaction [Line Items]
Compensation And Benefits				900,000	0		6,100,000	0
Advisory Fees | RCP 2
Related Party Transaction [Line Items]
Intercompany services						$ 850,000
Advisory Fees | Enhanced Capital Group LLC
Related Party Transaction [Line Items]
Management And Advisory Fees				$ 4,800,000	$ 0		$ 14,300,000	$ 0