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Real Estate - Summary of Dispositions (Detail) ft² in Thousands, $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) ft² Property | Mar. 31, 2018 USD ($) ft² Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Square feet | ft² | 967 | 0
Total gains on real estate transactions, net | $ 188,208 | $ 195,111
Partial redemptions of investments in co-investment ventures [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Gains on contributions, dispositions, or redemptions, net | 135,022 | 0
Continuing Operations [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Total gains on contributions and dispositions, net | $ 53,186 | $ 195,111
Continuing Operations [Member] | Contributions to unconsolidated co-investment ventures [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of buildings | Property | 19 | 8
Square feet | ft² | 8,149 | 3,078
Net proceeds | $ 744,165 | $ 539,822
Gains on contributions, dispositions, or redemptions, net | $ 37,138 | $ 167,726
Continuing Operations [Member] | Dispositions to Third Parties [Member] |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |
Number of buildings | Property | 2 | 11
Square feet | ft² | 670 | 1,303
Net proceeds | $ 52,024 | $ 87,981
Gains on contributions, dispositions, or redemptions, net | $ 16,048 | $ 27,385

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- Definition Amount before tax of gain (loss) recognized on the sale or disposal of a disposal group. Excludes discontinued operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2443-110228 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109226691&loc=d3e2941-110230 + Details
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