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Summary of Estimated Fair Values of Assets Acquired, Liabilities Assumed and Noncontrolling Interest (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2015 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2013 CNY (¥) | Oct. 01, 2013 CNY (¥) | Dec. 31, 2012 CNY (¥)
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Business Acquisition [Line Items] |  |  |  |  |  |
Goodwill | $ 2,376,667 | ¥ 15,395,573 | ¥ 17,418,895 | ¥ 16,864,350 |  | ¥ 3,877,564
Business Acquisitions 2014 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, purchase consideration |  |  | 398,410 |  |  |
Net assets acquired, excluding intangible assets and the related deferred tax liabilities |  |  | (95,961) |  |  |
Intangible assets, net |  |  | 249,452 |  |  |
Deferred tax liabilities, non-current |  |  | (67,945) |  |  |
Pre-existing equity interests |  |  | (91,677) |  |  |
Noncontrolling interests |  |  | (150,000) |  |  |
Goodwill |  |  | ¥ 554,541 |  |  |
Series of Individually Immaterial Business Acquisitions |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, purchase consideration |  |  |  | 3,865,378 |  |
Net assets acquired, excluding intangible assets and the related deferred tax liabilities |  |  |  | 467,159 |  |
Intangible assets, net |  |  |  | 796,415 |  |
Deferred tax liabilities, non-current |  |  |  | (112,233) |  |
Noncontrolling interests |  |  |  | (427,813) |  |
Goodwill |  |  |  | ¥ 3,141,850 |  |
Acquisition of 91 Wireless 2013 |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business combination, purchase consideration |  |  |  |  | ¥ 11,196,235 |
Net assets acquired, excluding intangible assets and the related deferred tax liabilities |  |  |  |  | 483,341 |
Intangible assets, net |  |  |  |  | 1,146,300 |
Deferred tax liabilities, non-current |  |  |  |  | (278,346) |
Goodwill |  |  |  |  | ¥ 9,844,940 |

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- Definition Fair value at acquisition-date of the assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interests issued by the acquirer, including but not limited to, instruments or interests issued or issuable in consideration for the business combination. + References No definition available. + Details
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