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Income Tax Expense - Reconciliation of Income Tax Expense (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Profit before tax ¥ 394,726 $ 56,779 ¥ 451,710 ¥ 971,864
Income tax expense at 15% 59,209 8,517 67,757 145,780
Adjustments:        
Non-deductible expenses 7,924 1,140 17,795 9,188
Tax-exempt income (500) (72) (2,181) (601)
Utilization of deferred tax benefits previously not recognized (3,093) (445) (29) (1,996)
Deferred tax benefits not recognized 22,606 3,252 10,356 6,097
Tax credits for research and development expense (76,835) (11,052) (59,633) (26,329)
Tax rate differential 10,901 1,568 16,517 24,251
(Over)/under provision in respect of previous years 27,303 3,927 (21,523) (259)
Withholding tax expense 11,535 1,659 14,639 36,332
Others 15 2 118 75
Consolidated income tax expense reported in the statement of profit or loss ¥ 59,065 $ 8,496 ¥ 43,816 ¥ 192,538