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Summary of Significant Accounting Policies and Procedures and Recent Accounting Pronouncements - Provision For Impairment (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) property | Dec. 31, 2016 USD ($) property item | Dec. 31, 2015 USD ($) property
Summary of Significant Accounting Policies and Procedures and Recent Accounting Pronouncements |  |  |
Number of properties classified as held for sale | 9 |  |
Total provisions for impairment | $ | $ 14,800,000 | $ 20,700,000 | $ 10,600,000
Number of impaired properties held-for-sale | 3 |  |
Number of impaired properties held-for-investment | 5 | 4 | 2
Number of impaired properties sold | 18 | 35 | 12
Number of impaired properties disposed from other than sale |  |  | 1
Impairment on existing goodwill | $ | $ 0 | $ 0 | $ 0
Noncontrolling Interests |  |  |
Number of properties acquired |  | 2 |
Number of joint ventures controlling interest acquired | item |  | 2 |

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- Definition The number of impaired properties disposed of other than by sale. + References No definition available. + Details
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- Definition The number of impaired properties held-for-investment. + References No definition available. + Details
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- Definition The number of impaired properties held for sale. + References No definition available. + Details
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- Definition The number of impaired properties sold. + References No definition available. + Details
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- Definition It represents the information of number of joint ventures in which controlling interest has been acquired. + References No definition available. + Details
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- Definition it represents the information of number of properties acquired. + References No definition available. + Details
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- Definition The number of real estate properties held for sale as of the end of the reporting period. + References No definition available. + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2611-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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