Subsequent Events (Details) (USD $)	9 Months Ended		30 Months Ended	39 Months Ended			40 Months Ended	1 Months Ended				1 Months Ended	40 Months Ended
	Sep. 30, 2014 property	Sep. 30, 2013 property	Dec. 31, 2013	Sep. 30, 2014	Sep. 30, 2014 Total portfolio, September 30, 2014 sqft property		Oct. 31, 2014 Subsequent Event	Oct. 31, 2014 Subsequent Event Acquisitions property sqft		Oct. 31, 2014 Subsequent Event Total portfolio, October 31, 2014 property sqft		Oct. 31, 2014 Common Stock Subsequent Event	Oct. 31, 2014 Common Stock Subsequent Event
Subsequent Event [Line Items]
Common stock, outstanding (in shares)	176,205,356		15,665,827	176,205,356			176,800,000
Proceeds from issuance of common stock	$ 1,569,328,000	$ 83,028,000	$ 154,200,000	$ 1,749,096,000			$ 1,800,000,000					$ 17,320,000	$ 1,766,416,000
Common stock outstanding	1,800,000,000			1,800,000,000			1,700,000,000
Share Price (in dollars per share)							$ 10.00
DRIP Share Price (in dollars per share)							$ 9.50
Property Acquisition [Roll Forward]
Beginning Balance, Number of Properties					246					290
Beginning Balance, Rentable Square Feet					11,641,731					14,113,618
Beginning Balance, Base Purchase Price					1,695,496,000	[1]				1,984,619,000	[1]
Number of properties purchased	209	8						44
Area of Real Estate Property, Acquisitions								2,471,887
Base Purchase Price, Acquisitions								289,123,000	[1]
Ending Balance, Number of Properties					246					290
Ending Balance, Rentable Square Feet					11,641,731					14,113,618
Ending Balance, Base Purchase Price					$ 1,695,496,000	[1]				$ 1,984,619,000	[1]

[1] Contract purchase price, excluding acquisition related costs, based on the exchange rate at the time of purchase.