Investments in real estate, net Dispositions (Details) (USD $)	3 Months Ended		13 Months Ended
	Mar. 31, 2015 sqft	Mar. 31, 2014	Mar. 31, 2015	Dec. 31, 2014 sqft
Dispositions [Line Items]
Area of Real Estate Property	18,527,998		18,527,998
Impairment of Real Estate	$ 14,510,000	$ 0
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, Net of Tax	(9,236,000)	0
INDIA
Dispositions [Line Items]
Foreign Currency Exchange Rate, Translation	4,200,000		4,200,000
Proceeds from Sale of Real Estate	12,400,000
Impairment of Real Estate			14,500,000
Development [Member] | North America [Member]
Dispositions [Line Items]
Area of Real Estate Property	1,800,000		1,800,000
Development [Member] | India Properties [Member]
Dispositions [Line Items]
Area of Real Estate Property				175,000
Near-term value-creation projects in North America (CIP)
Dispositions [Line Items]
Area of Real Estate Property	2,164,780.00		2,164,780.00
Land and Land Improvements [Member] | CANADA
Dispositions [Line Items]
Proceeds from Sale of Real Estate	54,100,000
Income-producing assets [Member] | PENNSYLVANIA
Dispositions [Line Items]
Proceeds from Sale of Real Estate	$ 1,900,000
Area of Real Estate Property	21,859		21,859