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Discontinued Operations and Disposition of Real Estate and Real Estate Investments - Operating Results Related to Assets Sold (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Discontinued Operations And Disposal Groups [Abstract]      
Revenues   $ 39,537 $ 81,241
Expenses      
Operating expenses   11,070 23,204
Impairment charges $ 0 8,877 53,553
Interest, net   9,947 19,457
Depreciation and amortization   16,254 27,568
Total expenses, discontinued operations   46,148 123,782
Loss from discontinued operations   (6,611) (42,541)
Gain on disposition of real estate, net of tax   96,009 11,274
Income (loss) from discontinued operations $ 0 $ 89,398 $ (31,267)