Investments In Unconsolidated Real Estate Entities (Summary Of Financial Information For Apartment LLCs) (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011		Jun. 30, 2011	Dec. 31, 2010
Real Estate Properties [Line Items]
Real estate assets, net of accumulated depreciation of $35,290 and $32,780 at June 30, 2012 and December 31, 2011, respectively	$ 2,099,355		$ 2,075,517
Total assets	2,204,845		2,139,064
Total liabilities	1,102,956		1,084,701
Members' equity	1,094,873		1,047,523		961,228	967,295
Total liabilities and equity	2,204,845		2,139,064
Investments in unconsolidated real estate entities	16,125		15,945
Apartment LLCs [Member]
Real Estate Properties [Line Items]
Real estate assets, net of accumulated depreciation of $35,290 and $32,780 at June 30, 2012 and December 31, 2011, respectively	215,421		217,443
Assets held for sale, net			28,846
Cash and other	7,117		6,526
Total assets	222,538		252,815
Mortgage notes payable	177,723		206,495
Other liabilities	3,299		2,737
Total liabilities	181,022		209,232
Members' equity	41,516		43,583
Total liabilities and equity	222,538		252,815
Company's equity investment in Apartment LLCs	$ (10,532)	[1]	$ (8,601)	[1]

[1] At June 30, 2012 and December 31, 2011, the Company's equity investment includes its credit investments of $16,125 and $15,945, respectively, discussed above.