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Share-based Payment - Expense Recognized for Employee Services Received (Detail) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of terms and conditions of share-based payment arrangement [abstract]      
Expense arising from equity-settled share-based payment transactions   ¥ 1,592 ¥ 5,301
Total expense arising from share-based payment transactions ¥ 1,592 [1] ¥ 5,301 [1]
[1] Restated