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Consolidated Statements Of Comprehensive Income In Thousands, except Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 USD ($) | Dec. 31, 2012 CNY | Dec. 31, 2011 CNY | Dec. 31, 2010 CNY | Dec. 31, 2012 Common Class A and Class B USD ($) | Dec. 31, 2012 Common Class A and Class B CNY | Dec. 31, 2011 Common Class A and Class B CNY | Dec. 31, 2010 Common Class A and Class B CNY | Dec. 31, 2012 Class A Ordinary Shares American Depositary Shares USD ($) | Dec. 31, 2012 Class A Ordinary Shares American Depositary Shares CNY | Dec. 31, 2011 Class A Ordinary Shares American Depositary Shares CNY | Dec. 31, 2010 Class A Ordinary Shares American Depositary Shares CNY
Revenues: |  |  |  |  |  |  |  |  |  |  |  |
Online marketing services | $ 3,570,672 | 22,245,643 | 14,489,767 | 7,912,869 |  |  |  |  |  |  |  |
Other services | 9,692 | 60,383 | 11,019 | 2,205 |  |  |  |  |  |  |  |
Total revenues | 3,580,364 | 22,306,026 | 14,500,786 | 7,915,074 |  |  |  |  |  |  |  |
Operating costs and expenses: |  |  |  |  |  |  |  |  |  |  |  |
Cost of revenues | (1,035,063) | (6,448,545) | (3,896,883) | (2,149,288) |  |  |  |  |  |  |  |
Selling, general and administrative | (401,492) | (2,501,336) | (1,692,810) | (1,088,980) |  |  |  |  |  |  |  |
Research and development | (369,950) | (2,304,825) | (1,334,434) | (718,038) |  |  |  |  |  |  |  |
Total operating costs and expenses | (1,806,505) | (11,254,706) | (6,924,127) | (3,956,306) |  |  |  |  |  |  |  |
Operating profit | 1,773,859 | 11,051,320 | 7,576,659 | 3,958,768 |  |  |  |  |  |  |  |
Other income: |  |  |  |  |  |  |  |  |  |  |  |
Interest income | 139,077 | 866,465 | 418,201 | 103,096 |  |  |  |  |  |  |  |
Interest expense | (17,312) | (107,857) | (82,551) | (35,975) |  |  |  |  |  |  |  |
Foreign exchange gain (loss), net | (728) | (4,533) | (1,959) | 6 |  |  |  |  |  |  |  |
Loss from equity method investments | (47,227) | (294,229) | (179,408) | (8,965) |  |  |  |  |  |  |  |
Other income, net | 72,916 | 454,271 | 78,237 | 44,233 |  |  |  |  |  |  |  |
Total other income | 146,726 | 914,117 | 232,520 | 102,395 |  |  |  |  |  |  |  |
Income before income taxes | 1,920,585 | 11,965,437 | 7,809,179 | 4,061,163 |  |  |  |  |  |  |  |
Income taxes | (252,670) | (1,574,159) | (1,188,861) | (535,995) |  |  |  |  |  |  |  |
Net income | 1,667,915 | 10,391,278 | 6,620,318 | 3,525,168 |  |  |  |  |  |  |  |
Net loss attributable to noncontrolling interests | (10,393) | (64,750) | (18,319) | 0 |  |  |  |  |  |  |  |
Net income attributable to Baidu, Inc. | 1,678,308 | 10,456,028 | 6,638,637 | 3,525,168 |  |  |  |  |  |  |  |
Basic |  |  |  |  | $ 47.93 | 298.62 | 190.27 | 101.28 | $ 4.79 | 29.86 | 19.03 | 10.13
Diluted |  |  |  |  | $ 47.88 | 298.29 | 189.88 | 100.96 | $ 4.79 | 29.83 | 18.99 | 10.10
Weighted average number of Class A and Class B ordinary shares outstanding |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  |  |  | 34,939,838 | 34,939,838 | 34,890,050 | 34,805,362 |  |  |  |
Diluted |  |  |  |  | 34,979,459 | 34,979,459 | 34,962,831 | 34,917,835 |  |  |  |
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | (979) | (6,100) | 32,930 | (3,611) |  |  |  |  |  |  |  |
Unrealized gains on available-for-sale securities | 1,828 | 11,391 | 45 | 0 |  |  |  |  |  |  |  |
Other comprehensive (loss) income, net of tax | 849 | 5,291 | 32,975 | (3,611) |  |  |  |  |  |  |  |
Comprehensive income | 1,668,764 | 10,396,569 | 6,653,293 | 3,521,557 |  |  |  |  |  |  |  |
Comprehensive loss attributable to noncontrolling interests | (10,527) | (65,584) | (19,314) | 0 |  |  |  |  |  |  |  |
Comprehensive income attributable to Baidu, Inc. | $ 1,679,291 | 10,462,153 | 6,672,607 | 3,521,557 |  |  |  |  |  |  |  |

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