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Fair Value Measurement - Additional Information (Detail) ¥ in Thousands, $ in Thousands | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥)
--- | --- | --- | ---
Cost method investments, write-down of carrying value | ¥ 1,002,539 | $ 154,087 | ¥ 869,741
Significant Unobservable Inputs (Level 3) |  |  |
Cost method investments, write-down of carrying value | 80,000 |  |
Cost method investments, fair value disclosure | ¥ 61,100 | $ 9,391 |

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