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Condensed Financial Information of the Parent Company - Condensed Statements of Comprehensive Income (Parenthetical) (Detail) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2014 USD ($) | Sep. 30, 2014 CNY | Sep. 30, 2013 CNY | Dec. 31, 2013 Parent Company [Member] USD ($) | Dec. 31, 2013 Parent Company [Member] CNY | Dec. 31, 2012 Parent Company [Member] CNY | Dec. 31, 2011 Parent Company [Member] CNY
Condensed Income Statements, Captions [Line Items] |  |  |  |  |  |  |
Other comprehensive income, tax |  |  |  |  |  |  |

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- Definition Amount of tax expense (benefit) allocated to other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 31 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 11 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=18498875&loc=d3e39076-109324 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e640-108580 + Details
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