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Investments - Long-term Investments - Additional information (Detail) ¥ in Thousands, $ in Thousands |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 26, 2015 shares | Dec. 31, 2015 USD ($) | Dec. 31, 2015 CNY (¥) | Dec. 31, 2014 CNY (¥) | Dec. 31, 2013 CNY (¥) | Dec. 31, 2015 CNY (¥)
Schedule of Investments [Line Items] |  |  |  |  |  |
Carrying amount of cost method investments |  | $ 1,130,000 |  | ¥ 1,740,000 |  | ¥ 7,300,000
Equity method investment, percentage of ownership |  | 24.39% |  |  |  | 24.39%
Gain on disposal of subsidiaries |  | $ 3,772,200 | ¥ 24,435,554 | 0 | ¥ 0 |
Carrying amount of equity method investments |  | 4,410,000 |  | 869,150 |  | ¥ 28,540,000
Impairment charges on long-term investments |  | 18,060 | 116,980 | ¥ 93,420 | ¥ 17,520 |
Qunar |  |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |  |
Gain on disposal of subsidiaries |  | 3,770,000 | ¥ 24,420,000 |  |  |
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 |  |  |  |  |
Carrying amount of equity method investments |  | $ 4,115,956 |  |  |  | ¥ 26,662,337
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 |  | 5 years | 5 years |  |  |
Available-for-sale investments maturity |  | 5 years | 5 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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