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Share Capital - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
May 31, 2016 $ / shares shares | Dec. 31, 2017 shares | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2015 CNY (¥) shares | Oct. 31, 2010 shares Vote
Class of Stock [Line Items] |  |  |  |  |  |
Proceeds from issuance of ordinary shares | ¥ |  |  | ¥ 2,548,695 |  | ¥ 1,808,498 |
Kingsoft |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Proceeds from issuance of ordinary shares | $ |  |  |  | $ 172,012 |  |
Xiaomi |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Proceeds from issuance of ordinary shares | $ |  |  |  | 50,000 |  |
Esta Investments |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Proceeds from issuance of ordinary shares | $ |  |  |  | $ 74,004 |  |
Class A Ordinary Shares |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Entitled vote per ordinary share | Vote |  |  |  |  |  | 1
Shares issued in settlement of contingent purchase considerations |  |  |  | 13,098,599 | 13,098,599 |
Business acquisition, shares issued | 10,087,476 |  |  |  |  |
Class A Ordinary Shares | Tuspark Innovation Venture Limited |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Business acquisition, shares issued | 31,996,874 |  |  |  |  |
Shares subscription price | $ / shares | $ 2.712 |  |  |  |  |
Class A Ordinary Shares | Kingsoft |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of new shares |  |  |  | 39,087,125 | 39,087,125 |
Class A Ordinary Shares | Xiaomi |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of new shares |  |  |  | 6,142,410 | 6,142,410 |
Class A Ordinary Shares | Esta Investments |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of new shares |  |  |  | 24,668,022 | 24,668,022 |
Class B Ordinary Shares |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Entitled vote per ordinary share | Vote |  |  |  |  |  | 10
Conversion ratio, Class B ordinary share into Class A Ordinary Share |  |  |  |  |  | 1
Class B Ordinary Shares | Tuspark Innovation Venture Limited |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Business acquisition, shares issued | 111,053,390 |  |  |  |  |
Shares subscription price | $ / shares | $ 2.712 |  |  |  |  |
Class B Ordinary Shares | Kingsoft |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of new shares |  |  |  | 18,250,268 | 18,250,268 |
Class B Ordinary Shares | Xiaomi |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Issuance of new shares |  |  |  | 10,524,257 | 10,524,257 |
American Depository Shares |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Business acquisition, shares issued |  | 0 | 223,161 | 146,372 | 146,372 |
American Depository Shares | Tuspark Innovation Venture Limited |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |
Shares subscription price | $ / shares | $ 16.274 |  |  |  |  |

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