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Real Estate - Real Estate Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Industrial operating properties:    
Total investments in real estate properties $ 21,038,790 $ 20,824,477
Less accumulated depreciation 2,698,043 2,568,998
Net investments in real estate properties 18,340,747 18,255,479
Improved land [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres      
Number of buildings      
Industrial operating properties:    
Total investments in real estate properties 4,116,518 4,074,647
Building and improvements [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres 270,527,000 267,097,000
Number of buildings 1,614 1,610
Industrial operating properties:    
Total investments in real estate properties 13,831,955 13,726,417
Development portfolio, including cost of land: Pre-stabilized [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres 5,289,000 4,491,000
Number of buildings 14 11
Industrial operating properties:    
Total investments in real estate properties 340,035 204,022
Properties Under Development [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres 15,386,000 18,587,000
Number of buildings 43 46
Industrial operating properties:    
Total investments in real estate properties 711,681 816,995
Land [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres 9,496,000 9,747,000
Number of buildings      
Industrial operating properties:    
Total investments in real estate properties 1,544,242 1,516,166
Other real estate investments [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres      
Number of buildings      
Industrial operating properties:    
Total investments in real estate properties $ 494,359 $ 486,230