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Capital contribution.

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Real estate investment ownership interest percentage.

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Escrow deposits related to property sales in noncash investing and financing activities.

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Investment and Disposition Activities - Additional Information (Detail) - USD ($)									1 Months Ended	12 Months Ended
	Oct. 11, 2018	Sep. 04, 2018	May 01, 2018	Mar. 02, 2018	Nov. 09, 2017	Aug. 14, 2017	Jul. 12, 2017	Jun. 29, 2017	Apr. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	Feb. 20, 2018	Dec. 31, 2016
Concord Debt Holdings and CDH CDO LLC [Member]
Investment And Disposition Activities [Line Items]
Liquidation value of property											$ 329,000
Aggregate distributions from venture										$ 812,000
New York, NY [Member] \| 701 Seventh WRT Investor LLC [Member]
Investment And Disposition Activities [Line Items]
Proceeds from sale of real estate, gross									$ 1,530,000,000
Proceeds placed in escrow									63,700,000
Proceeds from sale of real estate, net									200,000,000
New York, NY [Member] \| 701 Seventh WRT Investor LLC [Member] \| Joint Venture [Member]
Investment And Disposition Activities [Line Items]
Proceeds from purchase money note			$ 16,958,000						$ 75,000,000
Additional capital contributions				$ 1,667,000							5,834,000
Capital contributions				$ 136,003,000							134,336,000
New York, NY [Member] \| 701 Seventh WRT Investor LLC [Member] \| Joint Venture [Member] \| Maximum [Member]
Investment And Disposition Activities [Line Items]
Capital contributions											137,256,000
Lisle Illinois [Member] \| 1050 Corporetum [Member]
Investment And Disposition Activities [Line Items]
Ownership percentage in real estate investment												60.00%
Lisle Illinois [Member] \| 550 - 650 Corporetum [Member]
Investment And Disposition Activities [Line Items]
Proceeds from sale of real estate, gross							$ 9,300,000
Proceeds from sale of real estate, net							$ 7,920,000
Liquidation value of property													$ 8,940,000
Oklahoma [Memebr] \| Summit Pointe Apartments [Member]
Investment And Disposition Activities [Line Items]
Proceeds from sale of real estate, gross						$ 17,550,000
Proceeds from sale of real estate, net						$ 5,824,000
Ownership percentage in real estate investment						80.00%
Plantation, Florida [Member]
Investment And Disposition Activities [Line Items]
Proceeds from sale of real estate, gross		$ 11,250,000
Proceeds from sale of real estate, net		$ 1,074,000
Liquidation value of property											18,364,000
Jacksonville, Florida [Member]
Investment And Disposition Activities [Line Items]
Proceeds from sale of real estate, gross	$ 8,097,000
Proceeds from sale of real estate, net	$ 8,080,000
Liquidation value of property											8,400,000
Orlando Florida [Member]
Investment And Disposition Activities [Line Items]
Proceeds from sale of real estate, gross								$ 34,807,000
Proceeds from sale of real estate, net								$ 62,000
Liquidation value of property													35,053,000
Houston Texas [Member] \| Mosaic Apartments [Member]
Investment And Disposition Activities [Line Items]
Proceeds from sale of real estate, gross					$ 90,500,000
Proceeds from sale of real estate, net					$ 37,178,000
Ownership percentage in real estate investment					83.70%
Liquidation value of property													$ 91,200,000
Las Vegas Nevada [Member] \| RE CDO [Member]
Investment And Disposition Activities [Line Items]
Aggregate distributions from venture											$ 2,118,000
Las Vegas Nevada [Member] \| RE CDO [Member] \| Mortgage Loans Payable [Member]
Investment And Disposition Activities [Line Items]
Interest Rate											5.52%