Property Acquisitions and Dispositions - Summary of Disposition Activity (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 acre
Total consolidated land / outparcel acquisitions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Acreage	3.5
Purchase Price	$ 1,475
Assumed Debt	0
Total consolidated land / outparcel dispositions | Target and Shell Oil Parcels [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Location	Gaines Township, MI
Acreage	11.3
Date Sold	Feb. 12, 2015
Sales Price	5,150
Debt Repaid	0
Gain on Sale	3,196
Gaines Marketplace [Member] | Total consolidated land / outparcel acquisitions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Location	Gaines Township, MI
Acreage	1.9
Date Acquired	Feb. 12, 2015
Purchase Price	1,000
Assumed Debt	0
Lakeland Park Center [Member] | Total consolidated land / outparcel acquisitions
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Location	Lakeland, FL
Acreage	1.6
Date Acquired	Jan. 23, 2015
Purchase Price	475
Assumed Debt	$ 0
Income Producing Property Acquisition [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties held for sale	1