Taxation - Schedule of Unrecognized Tax Benefits (Detail) ¥ in Thousands, $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2017
CNY (¥)
|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2016
CNY (¥)
|
|
| Income Tax Disclosure [Abstract] | |||
| Beginning balance | ¥ 21,902 | $ 3,366 | ¥ 22,003 |
| Additions based on tax positions related to current year | 0 | 0 | 0 |
| Decreases based on tax positions related to prior years | (2,855) | (439) | (101) |
| Ending balance | ¥ 19,047 | $ 2,927 | ¥ 21,902 |