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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Real Estate Properties [Line Items]        
Income from real estate and related assets held for sale $ 18,390 $ 14,258 $ 35,526 $ 28,293
Real Estate Held for Sale [Member]
       
Real Estate Properties [Line Items]        
Operating revenue 215 292 507 583
Operating expense 1 57 40 114
Income from real estate and related assets held for sale $ 214 $ 235 $ 467 $ 469