v3.8.0.1

Real Estate - Summary of Dispositions (Detail) ft² in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) ft² Property | Sep. 30, 2016 USD ($) ft² Property | Sep. 30, 2017 USD ($) ft² Property | Sep. 30, 2016 USD ($) ft² Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gains on dispositions of investments in real estate and revaluation of equity investments upon acquisition of a controlling interest, net | $ 779,053 | $ 117,296 | $ 959,384 | $ 461,963
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 | 697,906 | 117,296 | 878,237 | 375,348
Gains on dispositions of investments in real estate and revaluation of equity investments upon acquisition of a controlling interest, net | $ 779,053 | $ 117,296 | $ 959,384 | $ 461,963
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 | 201 | 11 | 211 | 21
Square feet | ft² | 41,776 | 2,657 | 45,420 | 6,676
Net proceeds | $ 2,356,322 | $ 185,811 | $ 2,869,428 | $ 649,511
Gains on contributions, net (2) | $ 647,647 | $ 29,197 | $ 773,715 | $ 132,787
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 | 7 | 48 | 45 | 147
Square feet | ft² | 2,179 | 5,041 | 8,217 | 15,606
Net proceeds | $ 155,227 | $ 410,602 | $ 614,906 | $ 1,300,209
Gains on contributions, net (2) | 50,259 | 88,099 | 104,522 | 242,561
Continuing Operations [Member] | Revaluation of equity investments upon acquisition of controlling interest and redemption of investment in co-investment ventures [Member] |  |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |  |
Gains on contributions, net (2) | $ 81,147 | $ 0 | $ 81,147 | $ 86,615

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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/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=68055307&loc=d3e2443-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84176398&loc=d3e2941-110230 + Details
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