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Income Tax Expense - Reconciliation of Income Tax Expense (Detail)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CNY (¥)
Dec. 31, 2019
CNY (¥)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract]        
Accounting profit before tax ¥ 451,710 $ 71,447 ¥ 971,864 ¥ 1,033,319
Computed tax expense at 15% 67,757 10,717 145,780 154,998
Adjustments resulting from:        
Non-deductible expenses 17,795 2,815 9,188 3,982
Tax-exempt income (2,181) (345) (601) (6,171)
Utilization of deferred tax benefits previously not recognized (29) (5) (1,996) (5,076)
Deferred tax benefits not recognized 10,356 1,638 6,097 6,613
Tax credits for research and development expense (59,633) (9,432) (26,329) (31,863)
Tax rate differential 16,517 2,612 24,251 26,223
Over provision in respect of previous years (21,523) (3,404) (259) (6,985)
Withholding tax expense 14,639 2,315 36,332 30,898
Others 118 19 75  
Consolidated income tax expense reported in the statement of profit or loss ¥ 43,816 $ 6,930 ¥ 192,538 ¥ 172,619