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Shareholder's Equity - Additional Information (Detail) $ / shares in Units, ¥ in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 29, 2015 USD ($) | Jul. 30, 2015 USD ($) | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2017 CNY (¥) shares | Dec. 31, 2016 USD ($) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2015 CNY (¥) shares | Dec. 31, 2017 CNY (¥) shares | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2016 $ / shares
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 870,400,000 |  |  |  |  | 870,400,000 | 870,400,000 |
Par value per share (US$) | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.00005
Transfer of Class B ordinary shares to Class A Ordinary shares |  |  | 200,000 | 200,000 | 91,667 | 0 | 0 |  |  |
Stock repurchase program, proposed aggregate value | $ | $ 2,000,000,000 | $ 1,000,000,000 |  |  |  |  |  |  |  |
Stock repurchase program, period | 24 months | 12 months |  |  |  |  |  |  |  |
Number of Class A ordinary shares repurchased |  |  | 145,783 | 145,783 | 0 | 603,726 | 603,726 |  |  |
Aggregate purchase price |  |  | $ 251,000,000 | ¥ 1,724 | $ 0 | $ 990,000,000 | ¥ 6,377 |  |  |
Allocation of after-tax profits to statutory surplus fund, percentage |  |  | 10.00% | 10.00% |  |  |  |  |  |
Limit of statutory surplus fund as a percentage of registered capital, after which allocations to statutory surplus fund are no longer required |  |  | 50.00% | 50.00% |  |  |  |  |  |
Amounts of restricted paid up capital and statutory reserve funds of PRC subsidiaries and net assets of VIEs |  |  | $ 2,900,000,000 |  |  |  |  | ¥ 18,600 | ¥ 13,700 |
Preferred Stock |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Par value per share (US$) | $ / shares |  |  | $ 0.00005 |  |  |  |  |  |  |
Preferred stock, shares authorized |  |  | 10,000,000 |  |  |  |  | 10,000,000 |  |
Preferred stock, shares issued |  |  | 0 |  |  |  |  | 0 | 0 |
Preferred stock, shares outstanding |  |  | 0 |  |  |  |  | 0 | 0 |
Class A Ordinary Shares |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 825,000,000 |  |  |  |  | 825,000,000 | 825,000,000 |
Par value per share (US$) | $ / shares |  |  | $ 0.00005 |  |  |  |  |  |  | 0.00005
Number of votes per share |  |  | 1 | 1 |  |  |  |  |  |
Common stock, shares outstanding |  |  | 27,614,978 |  |  |  |  | 27,614,978 | 27,325,551 |
Class B Ordinary Shares |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 35,400,000 |  |  |  |  | 35,400,000 | 35,400,000 |
Par value per share (US$) | $ / shares |  |  | $ 0.00005 |  |  |  |  |  |  | $ 0.00005
Number of votes per share |  |  | 10 | 10 |  |  |  |  |  |
Common stock, shares outstanding |  |  | 7,201,254 |  |  |  |  | 7,201,254 | 7,401,254 |

X
- Definition Amount of restricted paid up capital and statutory reserve funds of PRC subsidiaries and net assets of VIEs as of the end of the most recently completed fiscal year. + References No definition available. + Details
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- Definition Represents the ratio of the statutory surplus fund to statutory registered capital after which mandatory contributions to the statutory surplus fund are no longer required for VIEs of the company. + References No definition available. + Details
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