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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, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Reconciliation of accounting profit multiplied by applicable tax rates [abstract] |  |  |  |
Accounting profit before tax | ¥ 971,864 | $ 150,180 | ¥ 1,033,319 | ¥ 1,181,067
Computed tax expense at 15% (2019: 15%, 2018: 15%) | 145,780 | 22,527 | 154,998 | 177,160
Adjustments resulting from: |  |  |  |
Non-deductible expenses | 9,188 | 1,420 | 3,982 | 5,146
Tax-exempt income | (601) | (93) | (6,171) | (3,634)
Utilization of deferred tax benefits previously not recognized | (1,996) | (308) | (5,076) | (5,518)
Deferred tax benefits not recognized | 6,097 | 942 | 6,613 | 2,183
Tax credits for research and development expense | (26,329) | (4,068) | (31,863) | (22,407)
Tax rate differential | 24,251 | 3,747 | 26,223 | 24,437
Over provision in respect of previous years | (259) | (39) | (6,985) | (729)
Withholding tax expense | 36,332 | 5,614 | 30,898 | 30,029
Others | 75 | 11 |  |
Consolidated income tax expense reported in the statement of profit or loss | ¥ 192,538 | $ 29,753 | ¥ 172,619 | ¥ 206,667

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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 2020-01-01 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=12&code=ifrs-tx-2020-en-r&anchor=para_81_c_i&doctype=Standard -URIDate 2020-01-01 + Details
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