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Income Taxes - Summary of Taxability of Cash Distributions Paid on Common Shares (Detail) - $ / shares | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Ordinary income | $ 2.97 | $ 2.98 | $ 2.50
Capital gains | 0.03 | 0.17 | 0.23
Return of capital | 0.15 |  |
Total | $ 3.15 | $ 3.15 | $ 2.73

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- Definition Amount of dividends per share taxable as capital gain. + References No definition available. + Details
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- Definition Estimated amount of dividends per share taxable. + References No definition available. + Details
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- Definition Amount of dividends per share taxable as ordinary income. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Per share or unit amount of capital distribution in excess of tax basis earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 205 -Section 50 -Paragraph 7 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=25866437&loc=d3e10246-115837 + Details
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