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Shareholders' Equity - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 CNY (¥) shares | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2015 CNY (¥) | Dec. 31, 2017 USD ($) $ / shares shares | May 31, 2014 $ / shares shares
Class of Stock [Line Items] |  |  |  |  |
Ordinary shares, shares authorized |  |  |  |  | 10,000,000,000
Allocations to general reserve as a percentage of profit after tax | 10.00% |  |  |  |
Threshold percentage of general reserve required to be maintained threshold percentage of general reserve required to be maintained | 50.00% |  |  |  |
Appropriation to statutory common reserve | 10.00% |  |  |  |
Threshold percentage of statutory common reserve required to be maintained | 50.00% |  |  |  |
Net assets restricted to transfer | ¥ 1,264,954 |  |  | $ 194,420 |
Other comprehensive income, tax expense or benefit | ¥ | ¥ 0 | ¥ 0 | ¥ 0 |  |
Common Class A [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Ordinary shares, shares authorized | 7,600,000,000 | 7,600,000,000 |  | 7,600,000,000 |
Ordinary shares, par value (in dollars per share) | $ / shares |  |  |  | $ 0.000025 |
Ordinary shares, shares outstanding | 409,345,857 | 380,922,773 |  | 409,345,857 |
Common Class B [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares transferred | 13,749,910 | 43,385,700 |  |  |
Ordinary shares, shares authorized | 1,400,000,000 | 1,400,000,000 |  | 1,400,000,000 |
Ordinary shares, par value (in dollars per share) | $ / shares |  |  |  | $ 0.000025 |
Ordinary shares, shares outstanding | 992,705,325 | 1,003,326,973 |  | 992,705,325 |
Reserved Shares |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Ordinary shares, shares authorized |  |  |  |  | 1,000,000,000
Ordinary shares, par value (in dollars per share) | $ / shares |  |  |  |  | $ 0.000025

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