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Real Estate Dispositions, Held for Sale and Impairment Charges - Components of Assets and Liabilities Held for Sale (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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ASSETS HELD FOR SALE |  |
Total Assets Held for Sale | $ 1,436 | $ 9,046
Liabilities Held for Sale |  |
Total Liabilities Held for Sale | 297 | 114
Real Estate Held for Sale |  |
ASSETS HELD FOR SALE |  |
Real estate, at cost | 2,287 | 12,997
Less: accumulated depreciation | 857 | 3,970
Total real estate held for sale, net | 1,430 | 9,027
Lease intangibles, net | 6 | 9
Deferred rent receivable, net | 0 | 10
Total Assets Held for Sale | 1,436 | 9,046
Liabilities Held for Sale |  |
Asset retirement obligation | 297 | 114
Total Liabilities Held for Sale | $ 297 | $ 114

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