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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, 2020 | Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
LPU amortization | $ 16,309 | $ 3,045
RSU amortization | 1,582 | 1,014
Equity-based compensation and allocations of net income to limited partnership units and FPUs | 42,204 | 12,141
LPUs [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Issuance of common stock and exchangeability expenses | 23,034 | 3,536
Class A Common Stock [Member] | LPUs [Member] |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Issuance of common stock and exchangeability expenses | 23,034 | 3,536
Allocations of net income1 | 1,279 | 4,546
LPU amortization | 16,309 | 3,045
RSU amortization | 1,582 | 1,014
Equity-based compensation and allocations of net income to limited partnership units and FPUs | $ 42,204 | $ 12,141

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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=27012166&loc=d3e187171-122770 + Details
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