Investment in Unconsolidated Ventures - Summarized Balance Sheet Information (Detail) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Equity Method Investment, Summarized Financial Information, Assets [Abstract]
Equity Method Investment, Summarized Financial Information, Assets	$ 94,808,000	$ 203,754,000
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]
Equity Method Investment, Summarized Financial Information, Liabilities and Equity	94,808,000	203,754,000
Investment in unconsolidated ventures	17,965,000	64,579,000
Recourse Debt [Member] | Equity Method Investments
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]
Long-term debt, current maturities	4,564,000	4,584,000
Cash and cash equivalents
Equity Method Investment, Summarized Financial Information, Assets [Abstract]
Equity Method Investment, Summarized Financial Information, Assets	5,854,000	13,119,000
Real estate
Equity Method Investment, Summarized Financial Information, Assets [Abstract]
Equity Method Investment, Summarized Financial Information, Assets	87,972,000	168,914,000
Other assets
Equity Method Investment, Summarized Financial Information, Assets [Abstract]
Equity Method Investment, Summarized Financial Information, Assets	982,000	21,721,000
Accounts Payable and Accrued Liabilities [Member]
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]
Equity Method Investment, Summarized Financial Information, Liabilities	1,979,000	13,101,000
Debt (a)
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]
Equity Method Investment, Summarized Financial Information, Liabilities	45,639,000	85,133,000
Equity
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract]
Equity Method Investment Summarized Financial Information, Equity	$ 47,190,000	$ 105,520,000