Related Parties - Summary of Sales to and Purchases from ATR's Minority Shareholder and Its Affiliates (Detail) ¥ in Thousands, $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2026 USD ($)	Jun. 30, 2026 CNY (¥)	Jun. 30, 2025 USD ($)	Jun. 30, 2025 CNY (¥)	Jun. 30, 2026 USD ($)	Jun. 30, 2026 CNY (¥)	Jun. 30, 2025 USD ($)	Jun. 30, 2025 CNY (¥)
Related Party Transaction [Line Items]
Sales to related parties	$ 102,918		$ 113,104		$ 211,245		$ 217,369
ATR [Member]
Related Party Transaction [Line Items]
Purchases from related parties	1,557	¥ 10,554	1,936	¥ 13,981	4,044	¥ 27,786	4,012	¥ 29,070
Related Party [Member] | ATR [Member]
Related Party Transaction [Line Items]
Sales to related parties	$ 5,014	¥ 34,153	$ 4,171	¥ 30,119	$ 10,210	¥ 70,154	$ 9,210	¥ 66,740