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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
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Equity Method Investments [Line Items]    
Preferred investment interest valuation allowance $ 72.4 $ 61.0
PIK [Member]    
Schedule Of Equity Method Investments [Line Items]    
Redeemable preferred equity, net $ 12.2 $ 6.3