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Other Income and Expenses Recognized in Statement of Profit and Loss - Summary of Sales Related Shipping and Handling Expenses Not Separately Billed to Customers (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Selling, general and administrative expenses [Member]        
Disclosure of income statement [Line Items]        
Selling, general and administrative expenses ¥ 208,197 $ 32,894 ¥ 159,023 ¥ 172,865