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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, 2024 USD ($)	Sep. 30, 2024 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2023 CNY (¥)
Related Party Transaction [Line Items]
Accounts receivable from related parties	$ 74,727		$ 78,939
Accounts payable to related parties	29,772		36,830
ATR [Member]
Related Party Transaction [Line Items]
Customer deposits			149	¥ 1,056
ATR [Member] \| Related Party [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	2,511	¥ 17,622	190	1,350
Accounts payable to related parties	$ 2,066	¥ 14,499	$ 401	¥ 2,841