Quarterly report pursuant to Section 13 or 15(d)

Real Estate Held for Sale and Impairment Charges - Components of Income from Real Estate and Related Assets Held for Sale (Detail)

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Real Estate Held for Sale and Impairment Charges - Components of Income from Real Estate and Related Assets Held for Sale (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Real Estate Properties [Line Items]        
Income from real estate and related assets held for sale $ 19,014 $ 16,190 $ 54,540 $ 44,482
Real Estate Held for Sale [Member]
       
Real Estate Properties [Line Items]        
Operating revenue   292 507 875
Operating expense   57 40 172
Income from real estate and related assets held for sale   $ 235 $ 467 $ 703