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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, 2017 CNY (¥) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 CNY (¥)
Reconciliation of accounting profit multiplied by applicable tax rates [Abstract] |  |  |  |
Accounting profit before tax | ¥ 1,625,237 | $ 256,776 | ¥ 883,878 | ¥ 686,138
Computed tax expense of 15% | 243,786 | 38,517 | 132,582 | 102,921
Adjustments resulting from: |  |  |  |
Non-deductible expenses | 21,982 | 3,473 | 7,039 | 9,815
Tax-exempt income | (58,324) | (9,215) | (178) | (5,574)
Utilization of deferred tax benefits previously not recognized | (7,374) | (1,165) | (3,157) | (2,001)
Deferred tax benefits not recognized | 8,084 | 1,277 | 9,045 | 61,299
Tax credits for research and development expense | (34,428) | (5,439) | (34,482) | (27,087)
Tax rate differential | 21,061 | 3,328 | 25,321 | 24,249
(Over)/under provision in respect of previous years current tax | (2,867) | (453) | 7,175 | (47)
Withholding tax expense | 29,447 | 4,652 | 16,925 | 13,126
Others | (1,200) | (190) |  | 117
Consolidated income tax expense reported in the statement of profit or loss | ¥ 220,167 | $ 34,785 | ¥ 160,270 | ¥ 176,818

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- Definition Reconciliation of adjustments resulting from accounting profit multiplied by applicable tax rates. + References No definition available. + Details
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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 2016-01-13 -Paragraph 81 -Subparagraph c -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_c_i&doctype=Standard -URIDate 2016-03-31 + Details
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