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Related Parties - Summary of Sales to and Purchases from ATR's Minority Shareholder and Its Affiliates (Detail) ¥ in Thousands, $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2025 CNY (¥)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 CNY (¥)	Sep. 30, 2025 USD ($)	Sep. 30, 2025 CNY (¥)	Sep. 30, 2024 USD ($)	Sep. 30, 2024 CNY (¥)
Related Party Transaction [Line Items]
Sales to related parties	$ 108,009		$ 96,166		$ 325,378		$ 317,369
ATR [Member]
Related Party Transaction [Line Items]
Purchases from related parties	2,657	¥ 19,066	1,994	¥ 14,221	6,669	¥ 48,136	5,132	¥ 36,809
ATR [Member] | Related Party [Member]
Related Party Transaction [Line Items]
Sales to related parties	$ 4,261	¥ 30,491	$ 4,094	¥ 29,156	$ 13,471	¥ 97,231	$ 12,267	¥ 87,980

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