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Investment in Associates - Summarized Investment in Associates (Detail) - Associates [member]
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2018
CNY (¥)
Disclosure of associates [line items]          
Share of profit/(loss) of associates, net of tax $ (9) ¥ (59) ¥ (28) ¥ 456  
Carrying amount of investment $ 318   ¥ 2,185   ¥ 2,130