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Other Income and Expenses Recognized in Statement of Profit and Loss - Summary of Staff Costs (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 (¥)
Profit or loss [Abstract] |  |  |  |
Wages and salaries | ¥ 1,158,320 | $ 183,006 | ¥ 922,847 | ¥ 839,288
Contribution to defined contribution plans | 258,190 | 40,792 | 275,703 | 297,926
Executive bonuses | 59,908 | 9,465 | 44,921 | 32,190
Staff welfare | 76,392 | 12,069 | 81,223 | 73,908
Staff severance cost | 107,732 | 17,021 | 12,864 | 8,385
Cost of share-based payment | 1,592 | 252 | 5,301 | 10,275
Others | 1,870 | 295 | 20,340 | 9,062
Staff costs | ¥ 1,664,004 | $ 262,900 | ¥ 1,363,199 | ¥ 1,271,034

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- Definition Staff severance costs. + References No definition available. + Details
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- Definition The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_102&doctype=Standard -URIDate 2016-03-31 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_99&doctype=Standard -URIDate 2016-03-31 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2016-01-13 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2016-03-30&anchor=para_104&doctype=Standard -URIDate 2016-03-31 + Details
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