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Compensation - Compensation Expense Related to Class A Common Stock (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
LPU amortization | $ 19,862 | $ 18,455 | $ 53,696 | $ 54,288
RSU amortization | 4,509 | 2,785 | 10,906 | 7,640
Equity-based compensation and allocations of net income to limited partnership units and FPUs | 78,490 | 33,007 | 170,275 | 103,030
LPUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Issuance of common stock and grants of exchangeability | 47,177 | 3,554 | 86,253 | 28,950
Class A Common Stock | LPUs |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Issuance of common stock and grants of exchangeability | 47,177 | 3,554 | 86,253 | 28,950
Allocation of net income | 6,943 | 8,213 | 19,420 | 12,152
LPU amortization | 19,861 | 18,455 | 53,696 | 54,288
RSU amortization | 4,509 | 2,785 | 10,906 | 7,640
Equity-based compensation and allocations of net income to limited partnership units and FPUs | $ 78,490 | $ 33,007 | $ 170,275 | $ 103,030

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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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