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Assets, Liabilities and Results of Operations of VIEs and Their Subsidiaries Included in Company's Consolidated Balance Sheets and Statements of Comprehensive Income (Detail) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 USD ($) | Dec. 31, 2012 CNY | Dec. 31, 2011 CNY | Dec. 31, 2010 CNY | Dec. 31, 2012 Variable Interest Entity, Primary Beneficiary USD ($) | Dec. 31, 2012 Variable Interest Entity, Primary Beneficiary CNY | Dec. 31, 2011 Variable Interest Entity, Primary Beneficiary CNY | Dec. 31, 2010 Variable Interest Entity, Primary Beneficiary CNY
Variable Interest Entity [Line Items] |  |  |  |  |  |  |  |
Total assets | $ 7,330,360 | 45,668,890 | 23,340,541 |  | $ 447,054 | 2,785,190 | 1,808,784 |
current | 5,565,575 | 34,674,089 | 15,848,156 |  | 203,734 | 1,269,283 | 1,008,640 |
non-current | 1,764,785 | 10,994,801 | 7,492,385 |  | 243,320 | 1,515,907 | 800,144 |
Total liabilities | 2,962,031 | 18,453,765 | 7,015,028 |  | 348,766 | 2,172,850 | 1,456,328 |
current | 1,322,053 | 8,236,529 | 4,406,547 |  | 307,303 | 1,914,531 | 1,342,268 |
non-current | 1,639,978 | 10,217,236 | 2,608,481 |  | 41,463 | 258,319 | 114,060 |
Total revenues | 3,580,364 | 22,306,026 | 14,500,786 | 7,915,074 | 1,031,942 | 6,429,099 | 4,205,327 | 1,832,629
Net income | $ 1,667,915 | 10,391,278 | 6,620,318 | 3,525,168 | $ 23,054 | 143,626 | 119,294 | 46,234

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