Commitments and Contingencies - Additional Information (Details)		9 Months Ended
	Oct. 06, 2016 USD ($)	Sep. 30, 2016 USD ($) property	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Commitments and Contingencies [Line Items]
Letters of credit outstanding, amount		$ 12,200,000
Amount advanced		$ 0
Number of real estate properties | property		120
Payments on assumed earnout liability		$ 0	$ (2,869,000)
Earnout | Inland Diversified Real Estate Trust
Commitments and Contingencies [Line Items]
Number of real estate properties | property		1
Contingent consideration, liability		$ 1,300,000		$ 1,400,000
Subsequent Event | Earnout | Inland Diversified Real Estate Trust
Commitments and Contingencies [Line Items]
Payments on assumed earnout liability	$ 1,300,000