Risk Management (Details)	Jun. 30, 2011
Percentage Geography [Line Items]
Percentage Geography	100.00%
Percentage Asset Types [Line Items]
Percentage Asset Types	100.00%
Percentage Tenant Industries [Line Items]
Percentage Tenant Industries	100.00%
Texas [Member]
Percentage Geography [Line Items]
Percentage Geography	17.00%
Tennessee [Member]
Percentage Geography [Line Items]
Percentage Geography	12.00%
California [Member]
Percentage Geography [Line Items]
Percentage Geography	16.00%
Georgia [Member]
Percentage Geography [Line Items]
Percentage Geography	9.00%
US [Member]
Percentage Geography [Line Items]
Percentage Geography	36.00%
Total Europe [Member]
Percentage Geography [Line Items]
Percentage Geography	10.00%
Total United States [Member]
Percentage Geography [Line Items]
Percentage Geography	90.00%
Industrial [Member]
Percentage Asset Types [Line Items]
Percentage Asset Types	29.00%
Warehouse Distribution [Member]
Percentage Asset Types [Line Items]
Percentage Asset Types	15.00%
Retail [Member]
Percentage Tenant Industries [Line Items]
Percentage Tenant Industries	12.00%
Office [Member]
Percentage Asset Types [Line Items]
Percentage Asset Types	42.00%
Other Asset [Member]
Percentage Asset Types [Line Items]
Percentage Asset Types	14.00%
Commercial [Member]
Percentage Tenant Industries [Line Items]
Percentage Tenant Industries	17.00%
Other Tenant [Member]
Percentage Tenant Industries [Line Items]
Percentage Tenant Industries	71.00%