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Significant Accounting Policies - Movements of the allowance for expected credit losses (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2024
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2022
CNY (¥)
Allowance for Doubtful Accounts        
Balance at January 1 ¥ 219,201   ¥ 305,535 ¥ 292,473
Provisions/(Reversal) 109,801 $ 15,043 (16,000) 130,549
Write-offs (45,009)   (70,334) (117,487)
Balance at December 31 ¥ 283,993   ¥ 219,201 ¥ 305,535