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Income Tax Expense - Reconciliation of Income Tax Expense (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2021
CNY (¥)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Profit before tax ¥ 571,352 $ 80,431 ¥ 394,726 ¥ 451,710
Income tax expense at 15% 85,703 12,064 59,209 67,757
Adjustments:        
Non-deductible expenses 5,888 829 7,924 17,795
Tax-exempt income (11,993) (1,688) (500) (2,181)
Utilization of deferred tax benefits previously not recognized (6,211) (874) (3,093) (29)
Deferred tax benefits not recognized 42,830 6,029 22,606 10,356
Tax credits for research and development expense (85,372) (12,018) (76,835) (59,633)
Tax rate differential 21,542 3,032 10,901 16,517
(Over)/under provision in respect of previous years 81,968 11,539 27,303 (21,523)
Withholding tax expense 14,872 2,094 11,535 14,639
Others (731) (103) 15 118
Consolidated income tax expense reported in the statement of profit or loss ¥ 148,496 $ 20,904 ¥ 59,065 ¥ 43,816