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Future Minimum Lease Payments Under Non Cancelable Operating Leases (Detail) - Dec. 31, 2017
¥ in Thousands, $ in Thousands
USD ($)
CNY (¥)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]    
2018 $ 39,202 ¥ 255,059
2019 16,127 104,926
2020 31,286 203,555
2021 11,211 72,939
2022 and thereafter 102,003 663,661
Operating Leases, Future Minimum Payments Due, Total $ 199,829 ¥ 1,300,140