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General - Schedule of Earnings (Loss) from Discontinued Operations (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
Discontinued Operations and Disposal Groups [Abstract]        
Revenues from rental properties $ 686 $ 1,324 $ 2,450 $ 4,409
Impairment charges (2,034) (2,929) (5,121) (6,555)
Other operating expenses (170) 2,825 (1,421) 1,171
Earnings (loss) from operating activities (1,518) 1,220 (4,092) (975)
Gains on dispositions of real estate 2,757 26,975 7,127 39,581
Earnings from discontinued operations $ 1,239 $ 28,195 $ 3,035 $ 38,606