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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

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- Definition Aggregate amount of net income allocated to limited partners. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770 + Details
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