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Employee Benefit Plans - Additional Information (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Employee Benefit Plans      
Contribution for multi-employer defined contribution plan ¥ 225,776 ¥ 203,524 ¥ 163,234