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Organization, Basis of Presentation and Use of Estimates - Schedule of Assets, Liabilities, and Net Assets of VIEs (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
VIEs [Member]
USD ($)
Sep. 30, 2014
VIEs [Member]
CNY
Dec. 31, 2013
VIEs [Member]
USD ($)
Dec. 31, 2013
VIEs [Member]
CNY
Dec. 31, 2012
VIEs [Member]
CNY
Variable Interest Entity [Line Items]                    
Current assets $ 387,064 2,375,796 $ 313,736 1,899,265 786,192 $ 111,967 687,253 $ 95,401 577,529 467,689
Non-current assets 264,820 1,625,465 266,562 1,613,685 1,593,481 261,630 1,605,887 265,409 1,606,709 1,591,626
Total assets 651,884 4,001,261 580,298 3,512,950 2,379,673 373,597 2,293,140 360,810 2,184,238 2,059,315
Current liabilities 110,536 678,466 130,469 789,818 336,292 88,201 541,378 81,555 493,710 418,471
Non-current liabilities 86,029 528,051 84,373 510,768 485,406 5,248 32,215 5,463 33,069 23,033
Total liabilities 196,565 1,206,517 214,842 1,300,586 821,698 93,449 573,593 87,018 526,779 441,504
Net assets           $ 280,148 1,719,547 $ 273,792 1,657,459 1,617,811