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Property and equipment, net (Schedule of Property and Equipment) (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2016 CNY (¥) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 CNY (¥)
--- | --- | --- | ---
Property and equipment, net [Line Items] |  |  |
Gross carrying amount | ¥ 1,250,773 |  | ¥ 1,112,767
Less: accumulated depreciation | (412,023) |  | (269,318)
Property and equipment, net | 838,750 | $ 120,805 | 843,449
Buildings [Member] |  |  |
Property and equipment, net [Line Items] |  |  |
Gross carrying amount | 482,333 |  | 482,387
Servers, computers and equipment [Member] |  |  |
Property and equipment, net [Line Items] |  |  |
Gross carrying amount | 565,786 |  | 453,441
Leasehold improvements [Member] |  |  |
Property and equipment, net [Line Items] |  |  |
Gross carrying amount | 80,812 |  | 69,929
Decoration of buildings [Member] |  |  |
Property and equipment, net [Line Items] |  |  |
Gross carrying amount | 68,981 |  | 66,140
Furniture, fixture and office equipment [Member] |  |  |
Property and equipment, net [Line Items] |  |  |
Gross carrying amount | 23,259 |  | 26,098
Motor vehicles [Member] |  |  |
Property and equipment, net [Line Items] |  |  |
Gross carrying amount | 24,016 |  | 12,835
Construction in progress [Member] |  |  |
Property and equipment, net [Line Items] |  |  |
Gross carrying amount | ¥ 5,586 |  | ¥ 1,937

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