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Real Estate - Investments in Real Estate Properties (Detail)
ft² in Thousands, $ in Thousands
Mar. 31, 2021
USD ($)
ft²
a
Building
Dec. 31, 2020
USD ($)
ft²
a
Building
Real Estate Properties [Line Items]    
Total investments in real estate properties $ 50,459,365 $ 50,384,328
Less accumulated depreciation 6,823,824 6,539,156
Net investments in real estate properties 43,635,541 43,845,172
Improved Land [Member]    
Real Estate Properties [Line Items]    
Total investments in real estate properties $ 12,025,439 $ 12,017,676
Building and Improvements [Member]    
Real Estate Properties [Line Items]    
Square feet of properties | ft² 441,737 441,336
Number of buildings | Building 2,265 2,261
Total investments in real estate properties $ 31,520,177 $ 31,489,943
Development Portfolio, Including Cost of Land: Pre-stabilized [Member]    
Real Estate Properties [Line Items]    
Square feet of properties | ft² 5,572 6,076
Number of buildings | Building 18 24
Total investments in real estate properties $ 480,918 $ 553,266
Properties Under Development [Member]    
Real Estate Properties [Line Items]    
Square feet of properties | ft² 22,990 22,004
Number of buildings | Building 62 61
Total investments in real estate properties $ 1,550,798 $ 1,329,345
Land [Member]    
Real Estate Properties [Line Items]    
Square feet of properties | a 5,113 5,304
Total investments in real estate properties $ 1,699,738 $ 1,606,358
Other Real Estate Investments [Member]    
Real Estate Properties [Line Items]    
Total investments in real estate properties $ 3,182,295 $ 3,387,740