Real Estate Acquisitions, Dispositions And Discontinued Operations (Schedule Deconsolidated Assets And Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate investments at cost	$ 337,160	$ 387,525
Less accumulated depreciation and amortization	(32,635)	(39,820)
Real estate investments at cost, net	304,525	347,705
Acquired lease intangibles, net	13,331	15,976
Tenant and accounts receivable, net	5,246	5,566
Loan costs and other assets	1,460	3,206
Notes payable	(181,096)	(218,579)
Accounts payable and other liabilities	(5,441)	(9,593)
MacArthur Park [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate investments at cost	50,541
Less accumulated depreciation and amortization	(8,964)
Real estate investments at cost, net	41,577
Acquired lease intangibles, net	1,257
Tenant and accounts receivable, net	214
Loan costs and other assets	497
Notes payable	(6,590)
Accounts payable and other liabilities	(1,006)
Net assets and liabilities contributed	35,949
AmREIT [Member] | MacArthur Park [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate investments at cost	15,162
Less accumulated depreciation and amortization	(2,689)
Real estate investments at cost, net	12,473
Acquired lease intangibles, net	377
Tenant and accounts receivable, net	64
Loan costs and other assets	150
Notes payable	(1,977)
Accounts payable and other liabilities	(302)
Net assets and liabilities contributed	10,785
Goldman Sachs [Member] | MacArthur Park [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate investments at cost	35,379
Less accumulated depreciation and amortization	(6,275)
Real estate investments at cost, net	29,104
Acquired lease intangibles, net	880
Tenant and accounts receivable, net	150
Loan costs and other assets	347
Notes payable	(4,613)
Accounts payable and other liabilities	(704)
Net assets and liabilities contributed	$ 25,164