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Related Party Disclosures - Compensation of Key Management Personnel (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Disclosure of transactions between related parties [abstract]        
Short-term employee benefits $ 5,935 ¥ 39,703 ¥ 40,831 ¥ 31,975
Contribution to defined contribution plans 50 335 385 415
Cost of share-based payment     1,294 4,387
Total $ 5,985 ¥ 40,038 ¥ 42,510 ¥ 36,777