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Investments in and Advances to Joint Ventures - Condensed Combined Financial Information of Company's Unconsolidated Joint Venture Investments (Parenthetical) (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Schedule Of Equity Method Investments [Line Items] |  |
Preferred investment interest valuation allowance | $ 107.4 | $ 87.9
PIK [Member] |  |
Schedule Of Equity Method Investments [Line Items] |  |
Redeemable preferred equity, net | $ 20.5 | $ 17.3

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