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Condensed Financial Information of the Parent Company - Condensed Statements of Comprehensive Income (Parenthetical) (Detail)
9 Months Ended 12 Months Ended
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