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Investments - Long-term Investments - Additional information (Detail) ¥ in Thousands, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 26, 2015 shares | Dec. 31, 2016 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2016 CNY (¥)
Schedule of Investments [Line Items] |  |  |  |  |  |
Carrying amount of cost method investments |  | $ 1,860,000 |  | ¥ 7,300,000 |  | ¥ 12,940,000
Aggregate deconsolidated gain |  | 204,320 | ¥ 1,420,000 |  |  |
Carrying amount of equity method investments |  | 4,650,000 |  | 28,540,000 |  | ¥ 32,260,000
Impairment charges on long-term investments |  | 35,330 | 245,330 | 116,980 | ¥ 93,420 |
Uber |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Gain on investment |  | $ 287,020 | ¥ 1,990,000 |  |  |
Qunar | Class A Ordinary Shares |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Number of shares exchanged | 178,702,519 |  |  |  |  |
Qunar | Class B Ordinary Shares |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Number of shares exchanged | 11,450,000 |  |  |  |  |
Ctrip.com International, Ltd |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Number of shares newly-issued in exchange | 11,488,381 |  |  |  |  |
Equity method investment, percentage of ownership |  | 20.49% |  |  |  | 20.49%
Ctrip.com International, Ltd | Total Other Income, Net |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Share transactions on equity method investments, gains recognized during period | ¥ |  |  |  | ¥ 24,420,000 |  |
Short-term Investments | Maximum |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Held-to-maturity debt investments maturity |  | 1 year | 1 year |  |  |
Available-for-sale investments maturity |  | 1 year | 1 year |  |  |
Other Long-term Investments | Maximum |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Held-to-maturity debt investments maturity |  | 2 years | 2 years |  |  |
Available-for-sale investments maturity |  | 2 years | 2 years |  |  |
Other Long-term Investments | Minimum |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Held-to-maturity debt investments maturity |  | 1 year | 1 year |  |  |
Available-for-sale investments maturity |  | 1 year | 1 year |  |  |

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