Related Parties - Summary of Balances Outstanding with ATR's Minority Shareholder and Its Affiliates (Detail) ¥ in Thousands, $ in Thousands	Jun. 30, 2026 USD ($)	Jun. 30, 2026 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2025 CNY (¥)
Related Party Transaction [Line Items]
Accounts receivable from related parties	$ 86,375		$ 78,981
Accounts payable to related parties	45,180		46,268
Related Party [Member] | ATR [Member]
Related Party Transaction [Line Items]
Accounts receivable from related parties	1,950	¥ 13,085	2,390	¥ 16,723
Accounts payable to related parties	$ 526	¥ 3,574	$ 69	¥ 481