Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) ¥ in Thousands, $ in Thousands |
Dec. 31, 2017
CNY (¥)
|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2016
CNY (¥)
|
|---|---|---|---|
| Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] | |||
| Prepayments | ¥ 125,317 | $ 19,262 | ¥ 317,262 |
| Rental deposits | 11,918 | 1,832 | 1,494 |
| Interest receivable | 3,462 | 532 | 11,690 |
| Staff advances | 7,496 | 1,152 | 7,712 |
| Receivables from third-party payment platform | 14,757 | 2,268 | 12,327 |
| Other receivables | 23,173 | 3,562 | 26,734 |
| Prepaid expenses and other current assets | ¥ 186,123 | $ 28,608 | ¥ 377,219 |