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Related Party Transactions - Compensation of Key Management Personnel (Detail)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2017
CNY (¥)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Disclosure of transactions between related parties [Abstract]        
Short-term employee benefits ¥ 40,831 $ 6,451 ¥ 31,975 ¥ 27,331
Contribution to defined contribution plans 385 61 415 305
Cost of share-based payment 1,294 204 4,387 8,477
Total ¥ 42,510 $ 6,716 ¥ 36,777 ¥ 36,113