Note 8 - Investment and Advances in Real Estate Joint Ventures (Details Textual) ft² in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2016 USD ($) ft²	Dec. 31, 2015 USD ($) ft²	Dec. 31, 2014 USD ($)
Gross Leasable Area | ft²	[1]	2,665	7,519
Number of Joint Ventures			3
Business Combination, Consideration Transferred		$ 645,624	$ 1,772,113
Other Liabilities		404,137	433,960
Equity Method Investments		$ 504,209	$ 742,559
All Equity Method Investments [Member]
Number of Real Estate Properties		135	191
Gross Leasable Area | ft²		26,200	35,400
Kim Pru and Kim Pru II [Member]
Number of Real Estate Properties	[2],[3]	48	53
Number of Joint Ventures		4
Number Of Accounts		4
Kim Pru [Member]
Number of Joint Ventures		3
CPP [Member]
Number of Real Estate Properties	[3],[4]	5	7
CPP [Member] | Property Interest Adjacent to Existing Operating Property in Temecula, CA [Member]
Business Combination, Consideration Transferred		$ 27,500
Real Estate Joint Ventures [Member] | Land Parcels [Member]
Number of Real Estate Properties, Interest Disposed of or Transferred		1	11
Real Estate Joint Ventures [Member] | Land Parcels [Member] | MEXICO
Number of Real Estate Properties		5
Real Estate Joint Ventures [Member] | Operating Properties [Member]
Business Combination, Consideration Transferred		$ 590,100	$ 1,600,000	$ 1,000,000
Number of Real Estate Properties, Interest Disposed of or Transferred		45	98	37
Equity Method Investment, Sales Price				$ 811,700
Equity Method Investment, Realized Gain (Loss) on Disposal				$ 96,000
Number of Real Estate Properties, Remaining Interest Acquired		9	43	34
Real Estate Joint Ventures [Member] | Operating Properties and Land Parcels [Member]
Equity Method Investment, Sales Price		$ 1,100,000	$ 1,800,000
Equity Method Investment, Realized Gain (Loss) on Disposal		$ 151,200	$ 380,600
Real Estate Joint Ventures [Member] | Development Properties [Member]
Number of Real Estate Properties, Remaining Interest Acquired		1
Other Joint Venture Programs [Member]
Number of Real Estate Properties	[5]	34	40
Other Liabilities		$ 11,000	$ 12,600

[1] Gross leasable area ("GLA")

[2] Represents four separate joint ventures, with four separate accounts managed by Prudential Global Investment Management ("PGIM"), three of these ventures are collectively referred to as KimPru and the remaining venture is referred to as KimPru II.

[3] The Company manages these joint venture investments and, where applicable, earns acquisition fees, leasing commissions, property management fees, asset management fees and construction management fees.

[4] During the year ended December 31, 2016, CPP joint venture acquired a property interest adjacent to an existing operating property in Temecula, CA for a gross purchase price of $27.5 million.

[5] Includes five land parcels located in Mexico.