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Gain on sale of development properties (Details) ¥ in Thousands, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 27, 2019 CNY (¥) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2017 CNY (¥) | Feb. 28, 2019 CNY (¥)
Gain on sale of development properties [Line Items] |  |  |  |  |  |
Total gross asset value to be disposed to Core Fund | ¥ 10,900,000 |  |  |  |  |
Gain on sale of development properties |  | $ 558,004 | ¥ 3,884,709 |  |  |
The initial annual rent under the lease agreements | ¥ 700,000 |  |  |  |  |
Percentage of lease and rent expense increase annually | 3.00% |  |  |  |  |
Rental rate adjusted with growth rate of fair market rent | 5 years |  |  |  |  |
Minimum |  |  |  |  |  |
Gain on sale of development properties [Line Items] |  |  |  |  |  |
Lease term | 5 years |  |  |  |  |
Maximum |  |  |  |  |  |
Gain on sale of development properties [Line Items] |  |  |  |  |  |
Lease term | 6 years |  |  |  |  |
Core Fund |  |  |  |  |  |
Gain on sale of development properties [Line Items] |  |  |  |  |  |
Gain on sale of development properties |  |  | ¥ 3,801,492 |  |  |
Total committed capital |  |  |  |  |  | ¥ 4,800,000
Core Fund | General partner |  |  |  |  |  |
Gain on sale of development properties [Line Items] |  |  |  |  |  |
Committed percentage of the total capital (as a percent) |  |  |  |  |  | 20.00%
Core Fund | GIC |  |  |  |  |  |
Gain on sale of development properties [Line Items] |  |  |  |  |  |
Committed percentage of the total capital (as a percent) |  |  |  |  |  | 80.00%

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- Definition The percentage committed of the total capital. + References No definition available. + Details
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- Definition Percentage of Lease and Rent Expense Increase Annually. + References No definition available. + Details
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- Definition The definition of "Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income. + References No definition available. + Details
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- Definition Amount of assets held-for-sale that are not part of a disposal group. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 15 -Paragraph 4 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=77912953&loc=d3e400-110220 + Details
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- Definition The difference between the carrying value and the sale price of real estate or properties that were intended to be sold or held for capital appreciation or rental income. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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 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=118932676&loc=d3e3602-108585 Reference 3: 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 + Details
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- Definition Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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