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Compensation - Compensation Expense Related to Class A Common Stock (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
LPU amortization | $ 17,094 | $ 16,309
RSU amortization | 2,916 | 1,582
Equity-based compensation and allocations of net income to limited partnership units and FPUs | 33,495 | 42,204
LPUs [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Issuance of common stock and grants of exchangeability | 7,854 | 23,034
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 | 7,854 | 23,034
Allocations of net income | 5,631 | 1,279
LPU amortization | 17,094 | 16,309
RSU amortization | 2,916 | 1,582
Equity-based compensation and allocations of net income to limited partnership units and FPUs | $ 33,495 | $ 42,204

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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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