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Income Tax Expense - Reconciliation of Income Tax Expense (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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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

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- Definition The amount that represents the difference between the tax expense (income) and the product of the accounting profit multiplied by the applicable tax rate(s) that relates to changes in the tax rate. [Refer: Accounting profit] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2021-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2021-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2021-03-24 + Details
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