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Significant Accounting Policies - Schedule of Lease Cost (Detail) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Cash Flow, Operating Activities, Lessee [Abstract]    
Cash payments for operating leases ¥ 107,772 ¥ 67,535
Right-of-use assets obtained in exchange for operating lease liabilities ¥ 260,867 ¥ 96,692