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Property and Equipment, Net - Summary of Property and Equipment (Detail)
In Thousands, unless otherwise specified
Sep. 30, 2014
USD ($)
Sep. 30, 2014
CNY
Dec. 31, 2013
USD ($)
Dec. 31, 2013
CNY
Dec. 31, 2012
CNY
Sep. 30, 2014
Purchased Software [Member]
USD ($)
Sep. 30, 2014
Purchased Software [Member]
CNY
Dec. 31, 2013
Purchased Software [Member]
USD ($)
Dec. 31, 2013
Purchased Software [Member]
CNY
Dec. 31, 2012
Purchased Software [Member]
CNY
Sep. 30, 2014
Electronic Equipment [Member]
USD ($)
Sep. 30, 2014
Electronic Equipment [Member]
CNY
Dec. 31, 2013
Electronic Equipment [Member]
USD ($)
Dec. 31, 2013
Electronic Equipment [Member]
CNY
Dec. 31, 2012
Electronic Equipment [Member]
CNY
Sep. 30, 2014
Office Equipment [Member]
USD ($)
Sep. 30, 2014
Office Equipment [Member]
CNY
Dec. 31, 2013
Office Equipment [Member]
USD ($)
Dec. 31, 2013
Office Equipment [Member]
CNY
Dec. 31, 2012
Office Equipment [Member]
CNY
Sep. 30, 2014
Motor Vehicles [Member]
USD ($)
Sep. 30, 2014
Motor Vehicles [Member]
CNY
Dec. 31, 2013
Motor Vehicles [Member]
USD ($)
Dec. 31, 2013
Motor Vehicles [Member]
CNY
Dec. 31, 2012
Motor Vehicles [Member]
CNY
Sep. 30, 2014
Leasehold Improvements [Member]
USD ($)
Sep. 30, 2014
Leasehold Improvements [Member]
CNY
Dec. 31, 2013
Leasehold Improvements [Member]
USD ($)
Dec. 31, 2013
Leasehold Improvements [Member]
CNY
Dec. 31, 2012
Leasehold Improvements [Member]
CNY
At cost:                                                            
Property and equipment, gross $ 21,002 128,909 $ 17,595 106,517 63,391 $ 1,526 9,364 $ 1,298 7,858 3,477 $ 17,204 105,602 $ 14,907 90,248 54,310 $ 121 742 $ 93 563 532 $ 416 2,554 $ 525 3,176 1,891 $ 1,735 10,647 $ 772 4,672 3,181
Less: Accumulated depreciation (10,576) (64,917) (8,031) (48,620) (23,533)                                                  
Property and equipment, net $ 10,426 63,992 $ 9,564 57,897 39,858