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Computation of Basic and Diluted Net Income Attributable to Baidu, Inc. Per Share for Class A and Class B Ordinary Shares (Detail) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2016 CNY (¥) ¥ / shares shares | Dec. 31, 2015 CNY (¥) ¥ / shares shares | Dec. 31, 2014 CNY (¥) ¥ / shares shares
Numerator |  |  |  |
Allocation of net income attributable to Baidu, Inc. | $ 1,595,038 | ¥ 11,074,351 | ¥ 33,334,993 | ¥ 13,144,249
Class A Ordinary Shares |  |  |  |
Numerator |  |  |  |
Allocation of net income attributable to Baidu, Inc. | $ 1,254,487 | ¥ 8,709,905 | ¥ 26,182,538 | ¥ 10,328,517
Denominator |  |  |  |
Denominator used for earnings per share - basic | 27,263,984 | 27,263,984 | 27,428,861 | 27,551,463
Earnings per share - basic | (per share) | $ 46.01 | ¥ 319.47 | ¥ 954.56 | ¥ 374.88
Numerator |  |  |  |
Allocation of net income attributable to Baidu, Inc. for diluted computation | $ 1,255,388 | ¥ 8,716,163 | ¥ 26,205,544 | ¥ 10,339,397
Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares | 339,650 | 2,358,188 | 7,129,449 | 2,804,852
Allocation of net income attributable to Baidu, Inc. | $ 1,595,038 | ¥ 11,074,351 | ¥ 33,334,993 | ¥ 13,144,249
Denominator |  |  |  |
Weighted average ordinary shares outstanding | 27,263,984 | 27,263,984 | 27,428,861 | 27,551,463
Conversion of Class B to Class A ordinary shares | 7,401,254 | 7,401,254 | 7,492,921 | 7,511,003
Share-based awards | 91,848 | 91,848 | 112,688 | 136,008
Denominator used for earnings per share - diluted | 34,757,086 | 34,757,086 | 35,034,470 | 35,198,474
Earnings per share - diluted | (per share) | $ 45.89 | ¥ 318.62 | ¥ 951.49 | ¥ 373.43
Class B Ordinary Shares |  |  |  |
Numerator |  |  |  |
Allocation of net income attributable to Baidu, Inc. | $ 340,551 | ¥ 2,364,446 | ¥ 7,152,455 | ¥ 2,815,732
Denominator |  |  |  |
Denominator used for earnings per share - basic | 7,401,254 | 7,401,254 | 7,492,921 | 7,511,003
Earnings per share - basic | (per share) | $ 46.01 | ¥ 319.47 | ¥ 954.56 | ¥ 374.88
Numerator |  |  |  |
Allocation of net income attributable to Baidu, Inc. for diluted computation | $ 339,650 | ¥ 2,358,188 | ¥ 7,129,449 | ¥ 2,804,852
Reallocation of net income attributable to Baidu, Inc. as a result of conversion of Class B to Class A shares | 0 | 0 | 0 | 0
Allocation of net income attributable to Baidu, Inc. | $ 339,650 | ¥ 2,358,188 | ¥ 7,129,449 | ¥ 2,804,852
Denominator |  |  |  |
Weighted average ordinary shares outstanding | 7,401,254 | 7,401,254 | 7,492,921 | 7,511,003
Conversion of Class B to Class A ordinary shares | 0 | 0 | 0 | 0
Share-based awards | 0 | 0 | 0 | 0
Denominator used for earnings per share - diluted | 7,401,254 | 7,401,254 | 7,492,921 | 7,511,003
Earnings per share - diluted | (per share) | $ 45.89 | ¥ 318.62 | ¥ 951.49 | ¥ 373.43
American Depositary Shares | Class A Ordinary Shares |  |  |  |
Denominator |  |  |  |
Denominator used for earnings per share - basic | 272,639,840 | 272,639,840 | 274,288,610 | 275,514,630
Earnings per share - basic | (per share) | $ 4.60 | ¥ 31.95 | ¥ 95.46 | ¥ 37.49
Denominator |  |  |  |
Weighted average ordinary shares outstanding | 272,639,840 | 272,639,840 | 274,288,610 | 275,514,630
Denominator used for earnings per share - diluted | 347,570,860 | 347,570,860 | 350,344,700 | 351,984,740
Earnings per share - diluted | (per share) | $ 4.59 | ¥ 31.86 | ¥ 95.15 | ¥ 37.34

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1377-109256 + Details
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- Definition Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1377-109256 + Details
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- Definition The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 65 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e2793-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60A -URI http://asc.fasb.org/extlink&oid=64863997&loc=SL5780132-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 66 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e2814-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e2740-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 60B -URI http://asc.fasb.org/extlink&oid=64863997&loc=SL5780133-109256 + Details
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