Investments in and Advances to Other Real Estate Partnerships - Condensed Combined Statements of Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Schedule Of Condensed Consolidating Statement Of Operations [Line Items]
Total Revenues	$ 75,715	$ 71,089
Property Expenses	(27,863)	(23,606)
Depreciation and Other Amortization	(25,984)	(23,319)
Interest Income	724	586
Interest Expense	(17,724)	(17,648)
Amortization of Deferred Financing Costs	(759)	(802)
Income from Continuing Operations	4,626	944
Discontinued Operations:
(Loss) Income Attributable to Discontinued Operations	20	740
Gain on Sale of Real Estate	432	(3,074)
Income (Loss) from Discontinued Operations	452	(2,334)
Net Income (Loss)	5,078	(1,128)
Other Real Estate Partnerships
Schedule Of Condensed Consolidating Statement Of Operations [Line Items]
Total Revenues	10,453	9,535
Property Expenses	(3,451)	(3,052)
Depreciation and Other Amortization	(2,788)	(2,985)
Interest Income	615	1,319
Interest Expense	(1,322)	(1,315)
Amortization of Deferred Financing Costs	(45)	(52)
Income from Continuing Operations	3,462	3,450
Discontinued Operations:
(Loss) Income Attributable to Discontinued Operations	(22)	76
Gain on Sale of Real Estate	303	0
Income (Loss) from Discontinued Operations	281	76
Net Income (Loss)	$ 3,743	$ 3,526