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Investment in Associates - Summarized Investment in Associates (Detail) - Associates [Member]
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2017
USD ($)
Disclosure of associates [Line Items]          
Share of profit/(loss) of associates, net of tax ¥ (28) $ (4) ¥ 456 ¥ 245  
Carrying amount of investment ¥ 2,185   ¥ 3,836   $ 345