Investment in Unconsolidated Ventures - Additional Information (Detail) (USD $)	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated ventures	$ 4,430,000	$ 782,000
Distributions of return on investments and earnings	1,923,000	1,580,000
Performance bonds and letters of credit	26,906,000
Investment in unconsolidated ventures	50,804,000		41,147,000
Multi Family Property [Member] | Austin, Texas [Member]
Schedule of Equity Method Investments [Line Items]
Performance bonds and letters of credit	26,577,000
Number Of Units Of Multifamily Project	257
CREA FMF [Member]
Schedule of Equity Method Investments [Line Items]
Investment in unconsolidated ventures	5,655,000		0
CREA FMF [Member] | Nashville, Tennessee [Member]
Schedule of Equity Method Investments [Line Items]
Number Of Units Of Multifamily Project	320
Contribution of Property	5,897,000
Reimbursed Costs From Unconsolidated Ventures	7,191,000
Construction Loan, Guaranty Of Repayment, Conditions Not Met, Percentage	25.00%
Construction Loan, Guaranty Of Repayment, Conditions Met, Percentage	0.00%
Construction Loans [Member] | CREA FMF [Member] | Nashville, Tennessee [Member]
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Unused Borrowing Capacity, Amount	51,950,000
Construction Loan	14,227,000
30 day LIBOR rate [Domain] | Construction Loans [Member]
Schedule of Equity Method Investments [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%
Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Long-term Debt, Current Maturities	77,510,000		37,966,000
Number of ventures under ownership interest using equity method	13
Non-recourse Debt [Member] | Equity Method Investments [Member]
Schedule of Equity Method Investments [Line Items]
Long-term Debt, Current Maturities	$ 37,795,000		$ 37,822,000