Basis of Presentation and Summary of Significant Accounting Policies (Details)	6 Months Ended
	Jun. 30, 2012
Leases, Acquired-in-Place [Member]
Estimated Useful Lives of Assets by Class
Estimated Useful Life of Assets Description	Remaining contractual lease term with consideration as to below-market extension options for below-market leases
Tenant origination and absorption cost [Member]
Estimated Useful Lives of Assets by Class
Estimated Useful Life of Assets Description	Remaining contractual lease term
Tenant Improvements [Member]
Estimated Useful Lives of Assets by Class
Estimated Useful Life of Assets Description	Shorter of estimated useful life or remaining contractual lease term
Land Improvements [Member] | Maximum [Member]
Estimated Useful Lives of Assets by Class
Estimated Life of Assets	25 years
Land Improvements [Member] | Minimum [Member]
Estimated Useful Lives of Assets by Class
Estimated Life of Assets	15 years
Building Improvements [Member] | Maximum [Member]
Estimated Useful Lives of Assets by Class
Estimated Life of Assets	20 years
Building Improvements [Member] | Minimum [Member]
Estimated Useful Lives of Assets by Class
Estimated Life of Assets	5 years
Building [Member] | Maximum [Member]
Estimated Useful Lives of Assets by Class
Estimated Life of Assets	40 years
Building [Member] | Minimum [Member]
Estimated Useful Lives of Assets by Class
Estimated Life of Assets	25 years