Segment Information (Schedule Of Segment's Contribution To Consolidated Revenues And Net Operating Income) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Segment Reporting Information [Line Items]
Other revenues	$ 209	$ 243	$ 637	$ 686
Revenues	86,374	78,612	248,810	227,567
Consolidated property net operating income	48,824	43,751	140,964	126,440
Interest income	20	374	359	982
Other revenues	209	243	637	686
Depreciation	(20,334)	(18,823)	(59,172)	(56,383)
Interest expense	(11,816)	(14,207)	(34,564)	(43,119)
Amortization of deferred financing costs	(667)	(717)	(2,026)	(2,085)
General and administrative	(3,763)	(3,970)	(11,931)	(12,332)
Investment and development	(203)	(239)	(1,005)	(1,013)
Other investment costs	(547)	(329)	(1,159)	(1,278)
Gains on condominium sales activities, net	10,261	2,581	25,695	8,757
Equity in income of unconsolidated real estate entities, net	475	235	7,416	790
Other income, net	(137)	(71)	444	230
Net loss on extinguishment of indebtedness			(301)
Net income	22,322	8,828	65,357	21,675
Fully Stabilized Communities [Member]
Segment Reporting Information [Line Items]
Revenues	77,167	72,330	225,616	210,052
Consolidated property net operating income	47,185	43,271	138,453	125,748
Development And Lease-Up Communities [Member]
Segment Reporting Information [Line Items]
Revenues	522		599
Consolidated property net operating income	(120)		(281)
Acquired Communities [Member]
Segment Reporting Information [Line Items]
Revenues	2,291		4,440
Consolidated property net operating income	1,301		2,469
Other Property Segments, Including Corporate Management Expenses [Member]
Segment Reporting Information [Line Items]
Revenues	6,185	6,039	17,518	16,829
Consolidated property net operating income	$ 458	$ 480	$ 323	$ 692