Note 4 - Investment and Advances in Real Estate Joint Ventures (Details) - Summary of Properties and Land Parcels Disposed of - Real Estate Joint Ventures $ in Millions		9 Months Ended
		Sep. 30, 2015 USD ($)		Sep. 30, 2014 USD ($)
KimPru and KimPru II [Member]
Long Lived Assets Held-for-sale [Line Items]
Number of properties		5
Number of land parcels		1
Aggregate sales price (in millions) (in Dollars)		$ 84.0
KIR [Member]
Long Lived Assets Held-for-sale [Line Items]
Number of properties		4		2
Aggregate sales price (in millions) (in Dollars)		$ 72.6		$ 17.7
RioCan [Member]
Long Lived Assets Held-for-sale [Line Items]
Number of properties		4
Aggregate sales price (in millions) (in Dollars)		$ 204.2
Latin America Portfolio [Member]
Long Lived Assets Held-for-sale [Line Items]
Number of properties		4		10
Number of land parcels		9
Aggregate sales price (in millions) (in Dollars)		$ 16.2		$ 202.1
Other Joint Venture Programs [Member]
Long Lived Assets Held-for-sale [Line Items]
Number of properties		6	[1]	14
Number of land parcels	[1]
Aggregate sales price (in millions) (in Dollars)		$ 123.7	[1]	$ 158.5
Other Institutional Programs [Member]
Long Lived Assets Held-for-sale [Line Items]
Number of properties	[2]			27
Number of land parcels	[2]
Aggregate sales price (in millions) (in Dollars)	[2]			$ 823.6

[1] The Company acquired the remaining interest in two of these properties. See Footnote 2 for the operating properties acquired by the Company during thenine months ended September 30, 2015.

[2] The Company acquired the remaining interest in 25 of these properties during the nine months ended September 30, 2014.