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Discontinued Operations (Detail) - property | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Discontinued Operations and Disposal Groups [Abstract] |  |  |
Number of Properties Classified As Discontinued Operations | 0 | 0 | 0

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- Definition The number of properties classified as discontinued operations. + References No definition available. + Details
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Balance Type: | na
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration