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Subsequent Events (Details) (Subsequent Event [Member], Cabot Industrial Value Fund III [Member], USD $)
0 Months Ended
Jul. 31, 2013
sqft
Subsequent Event [Member] | Cabot Industrial Value Fund III [Member]
 
Subsequent Event [Line Items]  
Business Acquisition, Cost of Acquired Entity, Purchase Price $ 1,475,000,000
Area of Real Estate Property 23,000,000
Noncash or Part Noncash Acquisition, Debt Assumed 230,000,000
Bridge Loan $ 1,270,000,000