Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Additional Information (Detail)

v3.21.2
Fair Value Measurements - Additional Information (Detail)
$ in Thousands
 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Discount Rate 10.50%      
Current portion of the fair value of contingent consideration $ 14,100   $ 5,500  
Non-current portion of the fair value of the contingent consideration 5,300   16,600  
Contingent consideration 5,800      
Unrealized gains or losses 0      
Fair value transfers related to purchases, issues and sales 0 $ 0    
Financing [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration 4,500      
Operating [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Contingent consideration 1,300      
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Liabilities measured at fair value 19,383 25,827 52,519 $ 24,418
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Make-Whole provision on Redeemable Preferred Units [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Liabilities measured at fair value $ 0 $ 1,706 $ 30,423 $ 891
Maximum [Member] | Measurement Input, Risk Free Interest Rate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability, Measurement Input 0.0007      
Maximum [Member] | Measurement Input, Price Volatility [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability, Measurement Input 0.35      
Maximum [Member] | Measurement Input, Discount Rate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability, Measurement Input 0.126      
Minimum [Member] | Measurement Input, Risk Free Interest Rate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability, Measurement Input 0.0004      
Minimum [Member] | Measurement Input, Price Volatility [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability, Measurement Input 0.15      
Minimum [Member] | Measurement Input, Discount Rate [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Business Combination, Contingent Consideration, Liability, Measurement Input 0.057