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Shareholder's Equity - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 30, 2015 USD ($) | Jul. 30, 2015 USD ($) | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2015 CNY (¥) shares | Dec. 31, 2014 CNY (¥) shares | Dec. 31, 2013 shares | Dec. 31, 2015 CNY (¥) shares | Dec. 31, 2014 $ / shares
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 870,400,000 |  |  |  | 870,400,000 |
Par value per share (US$) | $ / shares |  |  | $ 0.00005 |  |  |  |  | $ 0.00005
Transfer of Class B ordinary shares to Class A Ordinary shares |  |  |  |  | 45,000 | 225,079 |  |
Stock repurchase program, proposed aggregate value | $ | $ 2,000,000 | $ 1,000,000 |  |  |  |  |  |
Stock repurchase program, period | 24 months | 12 months |  |  |  |  |  |
Number of Class A ordinary shares repurchased |  |  | 603,726 | 603,726 |  |  |  |
Aggregate purchase price |  |  | $ 990,160 | ¥ 6,376,964 |  |  |  |
Allocation of after-tax profits to general reserve fund, percentage |  |  | 10.00% | 10.00% |  |  |  |
Limit of general reserve fund as a percentage of registered capital, after which allocations to general reserve fund are no longer required |  |  | 50.00% | 50.00% |  |  |  |
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 |  |  | $ 1,630,000 |  | ¥ 7,540,000 |  | ¥ 10,580,000 |
Preferred Stock |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Common stock, shares authorized |  |  | 10,000,000 |  |  |  | 10,000,000 |
Par value per share (US$) | $ / shares |  |  | $ 0.00005 |  |  |  |  |
Common stock, shares outstanding |  |  | 0 |  | 0 |  | 0 |
Common stock, shares issued |  |  | 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 |  |  |  |  |
Number of votes per share |  |  | 1 | 1 |  |  |  |
Common stock, shares outstanding |  |  | 27,113,541 |  | 27,613,315 |  | 27,113,541 |
Common stock, shares issued |  |  | 27,113,541 |  | 27,613,315 |  | 27,113,541 |
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 |  |  |  |  |
Number of votes per share |  |  | 10 | 10 |  |  |  |
Common stock, shares outstanding |  |  | 7,492,921 |  | 7,492,921 |  | 7,492,921 |
Common stock, shares issued |  |  | 7,492,921 |  | 7,492,921 |  | 7,492,921 |

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- 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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