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Compensation - Compensation Expense Related to Class A Common Stock (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
LPU amortization                 $ 74,282 $ 41,721 $ 6,346
RSU amortization                 10,291 7,465 5,212
Equity-based compensation and allocations of net income to limited partnership units and FPUs $ 80,515 $ 33,007 $ 27,819 $ 42,204 $ 69,389 $ 44,093 $ 45,002 $ 12,141 183,545 170,625 200,057
LPUs [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Issuance of common stock and grants of exchangeability                 84,966 100,948 150,147
Class A Common Stock [Member] | LPUs [Member]                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Issuance of common stock and grants of exchangeability                 84,966 100,948 150,147
Allocations of net income                 14,006 20,491 38,352
LPU amortization                 74,282 41,721 6,346
RSU amortization                 10,291 7,465 5,212
Equity-based compensation and allocations of net income to limited partnership units and FPUs                 $ 183,545 $ 170,625 $ 200,057