Real Estate and Intangible Assets - Additional Information (Detail) - property |
Dec. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Real Estate [Abstract] | ||
| Number of properties acquired | 7 | 3 |
| X | ||||||||||
- Definition Number of properties acquired. No definition available.
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| X | ||||||||||
- References No definition available.
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