Segment Information - Schedule of Segment's Contribution to Consolidated Revenues and Net Operating Income (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Segment Reporting Information [Line Items]
Other	$ 223	$ 229	$ 442	$ 443
Revenues	95,026	89,280	188,538	175,638
Consolidated property net operating income	53,008	50,878	105,705	99,738
Interest income	4	23	16	59
Other revenues	223	229	442	443
Depreciation	(20,829)	(21,170)	(42,596)	(42,114)
Interest expense	(10,433)	(11,042)	(21,677)	(22,094)
Amortization of deferred financing costs	(620)	(645)	(1,265)	(1,269)
General and administrative	(3,966)	(4,170)	(8,094)	(8,415)
Investment and development	(794)	(592)	(1,605)	(1,081)
Other investment costs	(210)	(516)	(483)	(821)
Other expenses	(502)		(1,409)
Gains on condominium sales activities, net		13,981	810	22,175
Equity in income of unconsolidated real estate entities, net	501	477	986	955
Other income (expense), net	(196)	(282)	(391)	(448)
Net loss on extinguishment of indebtedness	(4,287)		(4,287)
Income from continuing operations, before gains on sales of real estate assets	11,899	27,171	26,152	47,128
Gains on sales of real estate assets	36,092		36,092
Income from discontinued operations		443		876
Net income	47,991	27,614	62,244	48,004
Fully Stabilized Communities [Member]
Segment Reporting Information [Line Items]
Revenues	76,545	74,336	151,818	147,848
Consolidated property net operating income	46,086	45,945	92,404	91,525
Communities Stabilized During 2013 [Member]
Segment Reporting Information [Line Items]
Revenues	4,331	3,459	8,637	5,631
Consolidated property net operating income	2,693	1,912	5,365	2,586
Lease Up Communities [Member]
Segment Reporting Information [Line Items]
Revenues	2,632	245	4,511	269
Consolidated property net operating income	1,041	(252)	1,719	(280)
Acquired Communities [Member]
Segment Reporting Information [Line Items]
Revenues	1,233	383	2,443	383
Consolidated property net operating income	769	275	1,523	275
Held For Sale Communities [Member]
Segment Reporting Information [Line Items]
Revenues	4,820	5,735	10,689	11,337
Consolidated property net operating income	2,574	3,414	5,346	6,541
Other Property Segments, Including Corporate Management Expenses [Member]
Segment Reporting Information [Line Items]
Revenues	5,242	4,893	9,998	9,727
Consolidated property net operating income	$ (155)	$ (416)	$ (652)	$ (909)