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Employee Benefits - Additional Information (Detail) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plan [Abstract]      
Amount of employee benefits charged ¥ 144,596 ¥ 143,078 ¥ 128,554