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Real Estate - Real Estate Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
sqft
Dec. 31, 2013
Real Estate Properties [Line Items]    
Square Feet / Acres 12,600,000  
Industrial operating properties:    
Total investments in real estate properties $ 19,781,923 $ 20,824,477
Less accumulated depreciation 2,648,866 2,568,998
Net investments in real estate properties 17,133,057 18,255,479
Improved land [Member]
   
Industrial operating properties:    
Total investments in real estate properties 3,825,519 4,074,647
Building and improvements [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres 246,431,000 267,097,000
Number of buildings 1,457 1,610
Industrial operating properties:    
Total investments in real estate properties 12,803,481 13,726,417
Development portfolio, including cost of land: Pre-stabilized [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres 5,104,000 4,491,000
Number of buildings 12 11
Industrial operating properties:    
Total investments in real estate properties 383,072 204,022
Properties Under Development [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres 16,450,000 18,587,000
Number of buildings 47 46
Industrial operating properties:    
Total investments in real estate properties 736,003 816,995
Land [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres 9,346,000 9,747,000
Industrial operating properties:    
Total investments in real estate properties 1,579,737 1,516,166
Other real estate investments [Member]
   
Industrial operating properties:    
Total investments in real estate properties $ 454,111 $ 486,230