Business Combination (Details) (Cabot Industrial Value Fund III [Member], USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Oct. 08, 2013 sqft	Dec. 31, 2013
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition		Oct. 08, 2013
Business Acquisition, Name of Acquired Entity		Cabot Industrial Fund III Operating Partnership, L.P.
Business Acquisition, Percentage of Voting Interests Acquired	100.00%
Area of Real Estate Property	23,000,000
Business Combination, Consideration Transferred	$ 1,469
Industrial Property [Member]
Business Acquisition [Line Items]
Number of Real Estate Properties	177
Mortgages [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Liabilities Incurred	$ 229.8