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Related Party Transactions - Additional Information Quarterly (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Related Party Transaction [Line Items]                
Late payments bear interest rate 10.00% 10.00%   10.00%        
Tax savings agreement, percent 85.00% 85.00%   85.00%        
Amount due pursuant to tax receivable agreement $ 14,108 $ 14,108   $ 14,108   $ 0    
Partner promissory notes recognized as a reduction in equity 6,000 6,000   6,000   8,000 $ 7,900  
Total debt facilities 0 0   0   177,690 187,690  
Related party income   1,529 $ 2,412 5,303 $ 7,183 $ 9,263 8,810 $ 0
P W P Capital Holdings L P                
Related Party Transaction [Line Items]                
Late payments bear interest rate           10.00%    
PFAC Holdings                
Related Party Transaction [Line Items]                
Related party income       600        
Administrative services fee received 10,000              
Director                
Related Party Transaction [Line Items]                
Related party income       3,100        
Convertible notes                
Related Party Transaction [Line Items]                
Total debt facilities $ 0 $ 0   $ 0   $ 150,000 $ 150,000  
Affiliates | Convertible notes                
Related Party Transaction [Line Items]                
Total debt facilities           $ 8,700