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Investment in Real Estate - Fair Value Measurements on Non-Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Fair Value Assets Measured On Nonrecurring Basis [Line Items]  
Long-lived Assets Held for Sale or Sold Impairment $ (4,451)
Long-lived Assets Impairment (7,017)
Long-lived Assets Held and Used Impairment (2,566)
Impairment reversal of industrial properties and land parcels 9,678
Estimate of Fair Value, Fair Value Disclosure [Member]
  
Fair Value Assets Measured On Nonrecurring Basis [Line Items]  
Long-lived Assets Held for Sale or Sold 23,252
Long-lived Assets Held and Used 50,895
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
  
Fair Value Assets Measured On Nonrecurring Basis [Line Items]  
Long-lived Assets Held for Sale or Sold   
Long-lived Assets Held and Used   
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
  
Fair Value Assets Measured On Nonrecurring Basis [Line Items]  
Long-lived Assets Held for Sale or Sold   
Long-lived Assets Held and Used   
Fair Value, Measurements, Nonrecurring [Member] | Unobservable Inputs (Level 3) [Member]
  
Fair Value Assets Measured On Nonrecurring Basis [Line Items]  
Long-lived Assets Held for Sale or Sold 23,252
Long-lived Assets Held and Used $ 50,895