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Intangible Asset Estimated Amortization Expense (Detail) - Dec. 31, 2017
¥ in Thousands, $ in Thousands
CNY (¥)
USD ($)
Finite-Lived Intangible Assets [Line Items]    
2018 ¥ 34,715 $ 5,335
2019 18,202 2,797
2020 11,295 1,736
2021 1,254 193
2022 1,254 193
Thereafter ¥ 3,505 $ 539