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Disposition of Real Estate and Discontinued Operations - Operating Results Related to Assets Sold (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Discontinued Operations And Disposal Groups [Abstract]        
Revenues   $ 11,513   $ 25,583
Expenses        
Operating expenses   2,962   7,011
Impairment charges $ 0 0 $ 0 8,512
Interest, net   2,993   6,507
Depreciation and amortization   4,700   10,378
Total expenses, discontinued operations   10,655   32,408
Income (loss) from discontinued operations   858   (6,825)
Gain on disposition of real estate, net of tax   6,487   17,182
Income from discontinued operations $ 0 $ 7,345 $ 0 $ 10,357