Real Estate Activity (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012 Home Room	Jun. 30, 2011 Home	Jun. 30, 2012 Home Room	Jun. 30, 2011 Home	Dec. 31, 2011
Real Estate Properties [Line Items]
Number of units in real estate property	21,622		21,622
Condominium units, for-sale and under construction, aggregate carrying value	$ 40,353		$ 40,353		$ 54,845
Condominium homes sold	26	18	45	30
Income tax benefit			612
Austin Condominium Project [Member]
Real Estate Properties [Line Items]
Number of units in real estate property	148		148
Condominium units, for-sale and under construction, aggregate carrying value	29,956		29,956
Atlanta Condominium Project [Member]
Real Estate Properties [Line Items]
Number of units in real estate property	129		129
Condominium units, for-sale and under construction, aggregate carrying value	13,397		13,397
Post South End [Member]
Real Estate Properties [Line Items]
Number of units in real estate property	360		360
Square feet of retail space	7,612		7,612
Purchase price	$ 74,000		$ 74,000