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Commitments and Contingencies - Summary of Future Minimum Lease Payments under Non-Cancellable Operating Leases (Detail) - Dec. 31, 2016
¥ in Thousands, $ in Thousands
CNY (¥)
USD ($)
Commitments and Contingencies Disclosure [Abstract]    
2017 ¥ 108,202 $ 15,584
2018 87,711 12,633
2019 51,928 7,479
2020 and thereafter 0 0
Operating Leases, Future Minimum Payments Due, Total ¥ 247,841 $ 35,696