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Investments In Unconsolidated Subsidiaries - Additional information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investment management, property management, brokerage and other professional services [Member] | Real Estate Investments [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Revenues from unconsolidated subsidiaries | $ 97.0 | $ 134.3 | $ 100.3
Maximum [Member] |  |  |
Schedule Of Equity Method Investments [Line Items] |  |  |
Equity method investments in unconsolidated subsidiaries, variations in ownership percentage | 50.00% |  |

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