Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements - Summary of Company's Liabilities Measured at Fair Value on a Recurring Basis (Detail)

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Fair Value Measurements - Summary of Company's Liabilities Measured at Fair Value on a Recurring Basis (Detail) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Fair Value, Inputs, Level 1 [Member]        
Liabilities:        
Debt $ 1,641,719 $ 1,648,997    
Total liabilities measured at fair value 1,641,719 1,648,997    
Fair Value, Inputs, Level 3 [Member]        
Liabilities:        
Contingent purchase consideration 22,135 22,096    
Make-whole provision on Class B Preferred Units 51,035 30,423    
Total liabilities measured at fair value $ 73,170 $ 52,519 $ 25,540 $ 24,418