Mergers with Real Estate Businesses (Abandoned Spin-off of Multi-Tenant Shopping Center Portfolio; Sale to Blackstone/DDR Joint Venture) (Details) - $ / shares	May. 21, 2014	Mar. 13, 2014	Dec. 31, 2015	Jul. 20, 2015	Dec. 31, 2014	Apr. 04, 2014
Business Acquisition [Line Items]
Common stock, par value (in dollars per share)			$ 0.01	$ 0.01	$ 0.01
Blackstone Real Estate Partners VII LP and DDR Corporation [Member]
Business Acquisition [Line Items]
Finalization of documentation period	30 days
Common Stock [Member] | American Realty Capital Center, Inc. [Member]
Business Acquisition [Line Items]
Ownership percentage		25.00%
Per share distribution rate (shares)		10
Common stock, par value (in dollars per share)						$ 0.01
Member Units [Member] | American Realty Capital Center, Inc. [Member]
Business Acquisition [Line Items]
Per share distribution rate (shares)		10