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Leases - Schedule of Future Minimum Payments Under Non-Cancelable Operating Leases to Offices and Enrollment Centers (Details)
¥ in Thousands
Dec. 31, 2018
CNY (¥)
Commitments And Contingencies Disclosure [Abstract]  
2019 ¥ 110,796
2020 97,949
2021 90,347
2022 83,251
2023 and thereafter 698,995
Operating leases, future minimum payments due, Total ¥ 1,081,338