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Equity-Based Compensation and Equity - Share-based Compensation, Activity (Detail) - shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Common Series C Units [Member]      
Beginning of the period 174,190 156,975 150,906
Grants 2,900 21,953 10,830
Forfeitures (5,064) (4,738) (4,416)
Repurchases     (345)
End of the period 172,026 174,190 156,975
Common Series C2 Units [Member]      
Beginning of the period 33,400 33,525  
Grants 2,500 1,425 34,275
Forfeitures (3,625) (1,550) (750)
End of the period 32,275 33,400 33,525