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Business Combination - Additional Information (Detail) ¥ in Thousands, $ in Thousands |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 05, 2017 CNY (¥) | Dec. 05, 2017 USD ($) | Aug. 31, 2017 CNY (¥) | Jun. 08, 2016 CNY (¥) | May 28, 2015 CNY (¥) | Apr. 01, 2015 CNY (¥) | Jun. 30, 2016 CNY (¥) | Jan. 31, 2015 CNY (¥) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Income from cost method investment |  |  |  |  |  |  |  |  | ¥ 947,069 | $ 145,561 | ¥ 721 | ¥ 0 |
News Republic |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired (as a percent) |  |  |  | 100.00% |  |  |  |  |  |  |  |  |
Cash consideration |  |  |  | ¥ 339,414 |  |  |  |  |  |  |  |  |
consideration |  |  |  | ¥ 364,481 |  |  | ¥ 364,481 |  |  |  |  |  |
Percentage of shares to dispose of (as a percent) | 100.00% | 100.00% |  |  |  |  |  |  |  |  |  |  |
Total consideration from disposal | ¥ 566,044 | $ 85,840 |  |  |  |  |  |  |  |  |  |  |
Amount in Exchange for equity interest | $ |  | $ 50,000 |  |  |  |  |  |  |  |  |  |  |
Deconsolidation gain |  |  |  |  |  |  |  |  | ¥ 232,673 | $ 35,761 |  |  |
MobPartner |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired (as a percent) |  |  |  |  |  | 100.00% |  |  |  |  |  |  |
Cash consideration |  |  |  |  |  | ¥ 273,726 |  |  |  |  |  |  |
consideration |  |  |  |  |  | ¥ 314,237 |  |  |  |  |  |  |
Other acquisitions |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
consideration |  |  |  |  |  |  |  |  |  |  |  | ¥ 37,581 |
Baomi Technology [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired (as a percent) |  |  |  |  |  |  |  | 20.00% |  |  |  |  |
Cash consideration |  |  | ¥ 35,522 |  |  |  |  | ¥ 6,000 |  |  |  |  |
Voting rights percentage obtained after the additional acquisition |  |  |  |  |  |  |  |  | 50.52% | 50.52% |  |  |
Income from cost method investment |  |  |  |  |  |  |  |  | ¥ 6,276 | $ 965 |  |  |
Japan Kingsoft |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired (as a percent) |  |  |  |  |  |  |  |  |  |  | 4.60% |  | 41.50%
Cash consideration |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 98,097
consideration |  |  |  |  |  |  |  |  |  |  | ¥ 8,007 |  |
Percentage of voting right delegated |  |  |  |  |  |  |  |  |  |  | 5.00% |  |
Percentage of ownership |  |  |  |  |  |  |  |  |  |  | 46.10% |  |
Voting rights percentage obtained after the additional acquisition |  |  |  |  |  |  |  |  |  |  | 51.10% |  |
Moxiu Technology |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership percentage acquired (as a percent) |  |  |  |  | 1.60% |  |  |  |  |  |  |  | 50.50%
Cash consideration |  |  |  |  | ¥ 25,000 |  |  |  |  |  |  |  | ¥ 50,000
consideration |  |  |  |  | ¥ 88,488 |  |  |  |  |  |  |  |
Percentage of voting interest required for approval of significant financial and operating decisions |  |  |  |  |  |  |  |  |  |  |  |  | 67.00%
Voting rights percentage obtained after the additional acquisition |  |  |  |  | 52.10% |  |  |  |  |  |  |  |

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