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Income Tax Expense - Additional Information (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 CNY (¥) | Dec. 31, 2016 CNY (¥) | Dec. 31, 2015 | Dec. 31, 2017 USD ($)
Disclosure of Income Tax [Line items] |  |  |  |
Applicable income tax rate | 15.00% | 15.00% | 15.00% |
Percentage of withholding tax | 10.00% |  |  |
Deferred tax liability for withholding tax payable | ¥ 100,572 | ¥ 103,347 |  | $ 15,890
Unrecognized deferred tax liability relating to undistributed earnings | ¥ 228,008 | ¥ 212,176 |  | $ 36,024
Top of range [Member] |  |  |  |
Disclosure of Income Tax [Line items] |  |  |  |
Unrecognized tax losses expiration period for subsidiaries that have a history of losses | 5 years |  |  |

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- Definition Deferred tax liabilities not recognized related to temporary differences associated with undistributed earnings of subsidiaries. + References No definition available. + Details
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- Definition Provision for withholding tax payable. + References No definition available. + Details
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- Definition The applicable income tax rate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 12 -IssueDate 2016-01-13 -Paragraph 81 -Subparagraph c -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=12&date=2016-03-30&anchor=para_81_c_ii&doctype=Standard -URIDate 2016-03-31 + Details
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- Details
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