Accrued Expenses and Other Payables - Components of Accrued Expenses and Other Payables (Detail) ¥ in Thousands, $ in Thousands |
Dec. 31, 2017
CNY (¥)
|
Dec. 31, 2017
USD ($)
|
Dec. 31, 2016
CNY (¥)
|
|---|---|---|---|
| Payables and Accruals [Abstract] | |||
| VAT and surcharges payable | ¥ 88,435 | $ 13,592 | ¥ 82,759 |
| Payroll and welfare payable | 409,691 | 62,968 | 302,006 |
| Accrued rebates and cash incentives | 646,922 | 99,430 | 473,271 |
| Deposit from customers | 46,321 | 7,119 | 66,526 |
| Accrued expenses | 328,315 | 50,461 | 128,489 |
| Payable for purchase of fixed assets | 6,303 | 969 | 12,200 |
| Professional service fees | 5,236 | 805 | 12,570 |
| Payable for exercise of share-based awards | 5,735 | 881 | 10,464 |
| Others | 121,976 | 18,748 | 63,262 |
| Accrued expenses and other payables | ¥ 1,658,934 | $ 254,973 | ¥ 1,151,547 |