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Related Party Transactions - Additional Information Annual (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2021
Feb. 28, 2019
Related Party Transaction [Line Items]          
Late payments bear interest rate       10.00%  
Partner promissory notes recognized as a reduction in equity $ 8,000,000.0 $ 7,900,000   $ 6,000,000  
Debt instrument carrying amount 177,690,000 187,690,000   0  
Partner Promissory Notes          
Related Party Transaction [Line Items]          
Related party transaction, amounts of transaction 0 1,600,000 $ 0    
Proceeds from related party debt 0 1,300,000 0    
Notes receivable, related parties   1,800,000      
Notes receivable, forgiveness of principal and interest 0 0 300,000    
Debt instrument carrying amount 0   $ 0    
Convertible notes          
Related Party Transaction [Line Items]          
Debt instrument carrying amount 150,000,000 150,000,000   0  
Revolving Credit Facility          
Related Party Transaction [Line Items]          
Debt instrument carrying amount $ 27,690,000 37,690,000   $ 0  
P W P Capital Holdings L P          
Related Party Transaction [Line Items]          
Late payments bear interest rate 10.00%        
P W P Capital Holdings L P | Revolving Credit Facility | Line of Credit          
Related Party Transaction [Line Items]          
Financing receivable         $ 30,000,000
Affiliates | Convertible notes          
Related Party Transaction [Line Items]          
Debt instrument carrying amount $ 8,700,000 $ 8,700,000