XML 67 R56.htm IDEA: XBRL DOCUMENT v2.4.0.8
Real Estate - Real Estate Assets (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Industrial operating properties:    
Total investments in real estate properties $ 20,824,477 $ 25,809,123
Less accumulated depreciation 2,568,998 2,480,660
Net investments in real estate properties 18,255,479 23,328,463
Improved land [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres      
Number of buildings      
Industrial operating properties:    
Total investments in real estate properties 4,074,647 5,317,123
Building and improvements [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres 267,097,000 316,347,000
Number of buildings 1,610 1,853
Industrial operating properties:    
Total investments in real estate properties 13,726,417 17,291,125
Development portfolio, including cost of land: Pre-stabilized [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres 4,491,000 4,785,000
Number of buildings 11 15
Industrial operating properties:    
Total investments in real estate properties 204,022 472,413
Properties Under Development [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres 18,587,000 13,216,000
Number of buildings 46 30
Industrial operating properties:    
Total investments in real estate properties 816,995 479,230
Land [Member]
   
Real Estate Properties [Line Items]    
Square Feet / Acres 9,747,000 10,915,000
Number of buildings      
Industrial operating properties:    
Total investments in real estate properties 1,516,166 1,794,364
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 $ 486,230 $ 454,868