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Related Parties - Summary of Balances Outstanding with ATR's Minority Shareholder and Its Affiliates (Detail)
¥ in Thousands, $ in Thousands
Sep. 30, 2025
USD ($)
Sep. 30, 2025
CNY (¥)
Dec. 31, 2024
USD ($)
Dec. 31, 2024
CNY (¥)
Related Party Transaction [Line Items]        
Accounts receivable from related parties $ 80,983   $ 70,611  
Accounts payable to related parties 46,447   36,310  
ATR [Member] | Related Party [Member]        
Related Party Transaction [Line Items]        
Accounts receivable from related parties 2,166 ¥ 15,424 1,839 ¥ 13,422
Accounts payable to related parties $ 502 ¥ 3,574 $ 411 ¥ 3,001