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Basis of Presentation and Summary of Significant Accounting Policies - Income Taxes (Details) | 12 Months Ended
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Dec. 31, 2017
Accounting Policies [Abstract] |
Real estate investment trust required distribution (percent) | 90.00%

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- Definition The percentage of its taxable income the Company must distribute to qualify as a Real Estate Investment Trust (REIT). + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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