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Shareholder's Equity - Additional Information (Detail) $ / shares in Units, ¥ in Thousands |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Oct. 29, 2015 USD ($) | Jul. 30, 2015 USD ($) | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2015 CNY (¥) shares | Dec. 31, 2014 shares | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2015 $ / 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 |  |  | 91,667 | 0 | 0 | 45,000 |  |
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 |  |  | 0 | 603,726 | 603,726 |  |  |
Aggregate purchase price |  |  | $ 0 | $ 990,160,000 | ¥ 6,376,964 |  |  |
Allocation of after-tax profits to statutory surplus fund, percentage |  |  | 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% |  |  |  |  |
Amounts of restricted paid up capital and statutory reserve funds of PRC subsidiaries and net assets of VIEs |  |  | $ 1,970,000,000 |  | ¥ 10,580,000 |  | ¥ 13,700,000 |
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 |  |  |  |  |
Common stock, shares outstanding |  |  | 27,325,551 |  | 27,113,541 |  | 27,325,551 |
Common stock, shares issued |  |  | 27,325,551 |  | 27,113,541 |  | 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 |  |  |  |  |
Number of votes per share |  |  | 10 |  |  |  |  |
Common stock, shares outstanding |  |  | 7,401,254 |  | 7,492,921 |  | 7,401,254 |
Common stock, shares issued |  |  | 7,401,254 |  | 7,492,921 |  | 7,401,254 |

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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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- 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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- Definition Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 + Details
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