Non-Controlling Interest - Additional Information (Detail) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Noncontrolling Interest [Line Items] | ||
| Exchange of operating partnership units to common stock | 0 | 0 |
| Payment in cash for redemption of operating partnership units | $ 0 | $ 0 |
| Maximum [Member] | ||
| Noncontrolling Interest [Line Items] | ||
| Outstanding OP units held by outside limited partners | 1.00% | |
| X | ||||||||||
- Definition Exchange of operating partnership units to common stock. No definition available.
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| X | ||||||||||
- Definition Operating partnership units not owned by company. No definition available.
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| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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| X | ||||||||||
- Definition The cash outflow during the period for redemption of redeemable noncontrolling interests. No definition available.
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| X | ||||||||||
- Details
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