Investment In Unconsolidated Ventures - Additional Information (Detail)		12 Months Ended
		Dec. 31, 2015 USD ($) Property Venture	Dec. 31, 2014 USD ($) Property	Dec. 31, 2013 USD ($)
Payments to Acquire Additional Interest in Subsidiaries		$ 0	$ 7,971,000	$ 0
Noncontrolling interests		0	2,904,000	2,907,000
Investment in unconsolidated ventures		$ 82,453,000	65,005,000	41,147,000
Number of ventures under ownership interest using equity method | Venture		20
Payments to Acquire Interest in Joint Venture		$ 0	20,155,000
Distributions		24,909,000	7,518,000	9,854,000
Fees for services		1,856,000	2,275,000	1,068,000
Equity Method Investee [Member]
Payments to Acquire Interest in Joint Venture		26,349,000	14,692,000	857,000
FMF Littleton [Member]
Construction Loan	[1]	22,499,000
Investment in unconsolidated ventures		6,270,000	6,287,000
CREA FMF [Member]
Investment in unconsolidated ventures	[2]	3,820,000	5,516,000
Elan 99 LLC [Member]
Investment in unconsolidated ventures		14,255,000	8,679,000
Construction Loans [Member] | CREA FMF [Member] | Nashville, Tennessee [Member]
Construction Loan	[1],[2]	51,028,000
Construction Loans [Member] | Elan 99 LLC [Member] | Houston, Texas [Member]
Construction Loan	[1]	$ 14,721,000
Multi Family Property [Member]
Payments to Acquire Interest in Joint Venture				$ 0
Multi Family Property [Member] | Austin, Texas [Member]
Payments to Acquire Additional Interest in Subsidiaries			$ 21,500,000
Number Of Units Of Multifamily Project | Property		257	257
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			$ 55,275,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt			23,936,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value			$ 2,229,000

[1] Total includes current maturities of $39,590,000 at year-end 2015, of which $6,798,000 is non-recourse to us, and $65,795,000 at year-end 2014, of which $42,566,000 is non-recourse to us.

[2] Includes unamortized deferred gains on real estate contributed by us to ventures. We recognize deferred gains as income as real estate is sold to third parties. Deferred gains of $1,496,000 are reflected as a reduction to our investment in unconsolidated ventures at year-end 2015.