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Ordinary shares and treasury stock - Additional Information (Detail) $ / shares in Units, ¥ in Thousands, $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 10, 2017 CNY (¥) shares | Nov. 10, 2017 USD ($) $ / shares shares | Jun. 30, 2012 USD ($) $ / shares shares | Dec. 31, 2019 CNY (¥) shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 CNY (¥) shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 CNY (¥) | Oct. 20, 2017 $ / shares
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Authorized share capital | $ |  |  | $ 50,000 |  |  |  |  |  |
Ordinary and preferred shares authorized |  |  | 5,000,000,000 |  |  |  |  |  |
Ordinary stock, authorized |  |  | 4,266,159,600 |  |  |  |  |  |
Ordinary stock, par value | $ / shares |  |  | $ 0.00001 |  | $ 0.00001 |  |  |  | $ 0.00001
Preferred stock, shares authorized |  |  | 733,840,400 |  |  |  |  |  |
Common stock shares redesignated |  |  | 4,000,000 |  |  |  |  |  |
Issuance of ordinary shares upon Initial Public Offering ("IPO") and Concurrent Private Placement ("CPP"), net of expense | ¥ |  |  |  |  |  |  |  | ¥ 1,677,222 |
Ordinary stock, shares issued |  |  |  |  | 1,550,071,169 |  |  |  |
Stock Repurchased, Value | ¥ |  |  |  | ¥ 47,173 |  | ¥ 452,262 |  |  |
Treasury Stock [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Issuance of ordinary shares for share-based compensation plans |  |  |  | (17,000,000) | (17,000,000) | (30,000,000) | (30,000,000) |  |
Stock repurchased, Shares |  |  |  | (12,729,500) | (12,729,500) | (60,306,360) | (60,306,360) |  |
Stock Repurchased, Value | ¥ |  |  |  | ¥ 47,173 |  | ¥ 452,262 |  |  |
Exercise of share-based compensation plans, shares |  |  |  | 55,396,235 | 55,396,235 | 44,005,360 | 44,005,360 |  |
Shares not in use and not outstanding |  |  |  |  | 20,634,265 |  | 46,301,000 |  |
Class A Ordinary Shares [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Ordinary stock, authorized |  |  |  |  | 10,000,000,000 |  | 10,000,000,000 |  |
Ordinary stock, par value | $ / shares |  |  |  |  | $ 0.00001 |  | $ 0.00001 |  |
Preferred stock shares converted and designated |  |  | 1 |  |  |  |  |  |
Common stock shares redesignated |  |  | 1 |  |  |  |  |  |
Ordinary stock, shares issued |  |  |  |  | 964,071,169 |  | 874,071,169 |  |
Issuance of ordinary shares for share-based compensation plans |  |  |  | 17,000,000 | 17,000,000 | 30,000,000 | 30,000,000 |  |
Stock repurchased, Shares |  |  |  | 12,729,500 | 12,729,500 | 60,306,360 | 60,306,360 |  |
Stock Repurchased, Value |  |  |  | ¥ 47,173 | $ 6,802 | ¥ 452,262 | $ 67,622 |  |
Weighted Average Price per shares | $ / shares |  |  |  |  | $ 0.53 |  | $ 1.12 |  |
Class B Ordinary Shares [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
Ordinary stock, authorized |  |  |  |  | 10,000,000,000 |  | 10,000,000,000 |  |
Ordinary stock, par value | $ / shares |  |  |  |  | $ 0.00001 |  | $ 0.00001 |  |
Preferred stock shares converted and designated |  |  | 1 |  |  |  |  |  |
Ordinary stock, shares issued |  |  |  |  | 586,000,000 |  | 659,000,000 |  |
Ordinary stock, shares sold |  |  |  | 73,000,000 | 73,000,000 | 2,000,000 | 2,000,000 |  |
IPO [Member] | Class A Ordinary Shares [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
"Issuance of ordinary shares upon Initial Public Offering (""IPO"") and Concurrent Private Placement (""CPP""), net of expense, Shares " | 85,000,000 | 85,000,000 |  |  |  |  |  |  |
Common stock shares sold price per share | $ / shares |  | $ 2.6 |  |  |  |  |  |  |
Issuance of ordinary shares upon Initial Public Offering ("IPO") and Concurrent Private Placement ("CPP"), net of expense | ¥ 1,464,800 | $ 221,000 |  |  |  |  |  |  |
IPO [Member] | American Depositary Shares [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
"Issuance of ordinary shares upon Initial Public Offering (""IPO"") and Concurrent Private Placement (""CPP""), net of expense, Shares " | 17,000,000 | 17,000,000 |  |  |  |  |  |  |
Common stock shares sold price per share | $ / shares |  | $ 13.0 |  |  |  |  |  |  |
Private Placement [Member] | Class A Ordinary Shares [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
"Issuance of ordinary shares upon Initial Public Offering (""IPO"") and Concurrent Private Placement (""CPP""), net of expense, Shares " | 19,230,769 | 19,230,769 |  |  |  |  |  |  |
Issuance of ordinary shares upon Initial Public Offering ("IPO") and Concurrent Private Placement ("CPP"), net of expense | ¥ 331,400 | $ 50,000 |  |  |  |  |  |  |
Private Placement [Member] | American Depositary Shares [Member] |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |
"Issuance of ordinary shares upon Initial Public Offering (""IPO"") and Concurrent Private Placement (""CPP""), net of expense, Shares " | 3,846,154 | 3,846,154 |  |  |  |  |  |  |

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