Equity Investments in Unconsolidated Joint Ventures - Summary of Combined Financial Information of Unconsolidated Entities, Statements of Operations (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended				1 Months Ended	6 Months Ended	1 Months Ended	6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013		Mar. 31, 2013 Ramco/Lion Venture LP	Jun. 30, 2014 Ramco/Lion Venture LP Pro-rata Share	Mar. 31, 2013 Shopping Centers Ramco/Lion Venture LP Property	Jun. 30, 2014 Ramco-Gershenson Properties Trust
Schedule of Equity Method Investments [Line Items]
Gain on sale of land	$ 740	[1]	$ 0	[1]	$ 740	[1]	$ 0	[1]				$ 400
Gain on extinguishment of debt	0	[2]	0	[2]	529	[2]	0	[2]				100
Number of real estate properties sold											12
(Loss) on sale of real estate	0	[3]	(295)	[3]	0	[3]	(21,512)	[3]	(21,500)
Liquidation related expense										$ 72

[1] The gain on sale relates to a joint venture property that was sold in 2011 and additional proceeds received in June 2014. Our share of the gain was approximately $0.4 million.

[2] As a result of a property conveyance, a joint venture recognized a gain on extinguishment of debt of which our share was approximately $0.1 million.

[3] In March 2013, Ramco/Lion Venture LP sold 12 shopping centers to us resulting in a loss on the sale of $21.5 million to the joint venture.