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Cash and Cash Equivalents - Summary of Cash Flows, Cash and Cash Equivalents (Detail)
¥ in Thousands, $ in Thousands
Dec. 31, 2019
CNY (¥)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2016
CNY (¥)
Cash and cash equivalents [abstract]            
Cash at banks and on hand ¥ 5,205,605 $ 734,726 ¥ 5,110,520      
Short-term bank deposits 547,663 77,298 449,370      
Cash and cash equivalents ¥ 5,753,268 $ 812,024 ¥ 5,559,890 $ 784,729 ¥ 5,390,324 ¥ 3,653,914