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Related Parties - Summary of Balances Outstanding with ATR's Minority Shareholder and Its Affiliates (Detail) ¥ in Thousands, $ in Thousands	Jun. 30, 2025 USD ($)	Jun. 30, 2025 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2024 CNY (¥)
Related Party Transaction [Line Items]
Accounts receivable from related parties	$ 84,339		$ 70,611
Accounts payable to related parties	45,284		36,310
ATR [Member] | Related Party [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	1,850	¥ 13,262	1,839	¥ 13,422
Accounts payable to related parties	$ 622	¥ 4,457	$ 411	¥ 3,001

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