Organization And Significant Accounting Policies (Narrative) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012 Room Property	Jun. 30, 2011	Jun. 30, 2012 Year Room Property	Jun. 30, 2011	Dec. 31, 2011
Real Estate Properties [Line Items]
Number of units in real estate property	21,622		21,622
Number of real estate properties	58		58
Common stock, shares outstanding	54,109		54,109		52,988
Noncontrolling interest, ownership percentage by parent	99.70%	99.70%	99.70%	99.70%
Common units held by persons other than the Company	143		143
Noncontrolling interest, ownership percentage by noncontrolling owners	0.30%		0.30%
Revenue recognized lease (in years)			1
Development or construction costs	$ 913	$ 627	$ 1,719	$ 1,096
Atlanta, Georgia [Member]
Real Estate Properties [Line Items]
Concentration of location for communities, percentage	33.40%		33.40%
Dallas, Texas [Member]
Real Estate Properties [Line Items]
Concentration of location for communities, percentage	23.80%		23.80%
Washington, D.C. [Member]
Real Estate Properties [Line Items]
Concentration of location for communities, percentage	13.00%		13.00%
Tampa, Florida [Member]
Real Estate Properties [Line Items]
Concentration of location for communities, percentage	10.70%		10.70%
Cost Capitalization [Member]
Real Estate Properties [Line Items]
Weighted average borrowing costs, percentage	5.60%	6.00%	5.60%	6.00%
Unconsolidated Properties [Member]
Real Estate Properties [Line Items]
Number of units in real estate property	1,471		1,471
Number of real estate properties	4		4
Under Construction [Member]
Real Estate Properties [Line Items]
Number of units in real estate property	1,810		1,810
Number of real estate properties	6		6
For-Sale Condominium Homes [Member]
Real Estate Properties [Line Items]
Number of real estate properties	2		2
Buildings And Components [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)			40 years
Other Building And Land Improvements [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)			20 years
Furniture, Fixtures And Equipment [Member] | Minimum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)			5 years
Furniture, Fixtures And Equipment [Member] | Maximum [Member]
Real Estate Properties [Line Items]
Estimated useful life (in years)			10 years