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Fair Value Measurements on Non-Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2011
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]  
Long-lived Assets Impairment $ (8,813)
Long-lived Assets Held and Used 64,604 [1]
Long-lived Assets Held and Used Impairment (3,369) [1]
Long-lived Assets Held for Sale or Sold 25,502 [1]
Long-lived Assets Held for Sale or Sold Impairment (5,444) [1]
Fair Value, Measurements, Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
  
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]  
Long-lived Assets Held and Used    [1]
Long-lived Assets Held for Sale or Sold    [1]
Fair Value, Measurements, Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
  
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]  
Long-lived Assets Held and Used    [1]
Long-lived Assets Held for Sale or Sold    [1]
Fair Value, Measurements, Nonrecurring [Member] | Unobservable Inputs (Level 3) [Member]
  
Fair Value Assets And Liabilities Measured On Nonrecurring Basis [Line Items]  
Long-lived Assets Held and Used 64,604 [1]
Long-lived Assets Held for Sale or Sold $ 25,502 [1]
[1] Excludes industrial properties and land parcels for which an impairment reversal of $11,116 was recorded during the nine months ended September 30, 2011, since the related assets are recorded at carrying value, which is lower than estimated fair value at September 30, 2011.