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FAIR VALUE MEASUREMENT (Details) | Dec. 31, 2013 USD ($) | Dec. 31, 2013 CNY | Dec. 31, 2012 CNY | Dec. 31, 2013 Hanting USD ($) | Dec. 31, 2013 Hanting CNY | Dec. 31, 2013 Measured on recurring basis USD ($) | Dec. 31, 2013 Measured on recurring basis CNY | Dec. 31, 2012 Measured on recurring basis USD ($) | Dec. 31, 2012 Measured on recurring basis CNY | Dec. 31, 2013 Measured on recurring basis Hanting USD ($) | Dec. 31, 2013 Measured on recurring basis Hanting CNY | Dec. 31, 2012 Measured on recurring basis Hanting USD ($) | Dec. 31, 2012 Measured on recurring basis Hanting CNY | Dec. 31, 2013 Measured on recurring basis eHi USD ($) | Dec. 31, 2013 Measured on recurring basis eHi CNY | Dec. 31, 2013 Measured on recurring basis Easy Go USD ($) | Dec. 31, 2013 Measured on recurring basis Easy Go CNY | Dec. 31, 2013 Measured on recurring basis Dining Secretary USD ($) | Dec. 31, 2013 Measured on recurring basis Dining Secretary CNY | Dec. 31, 2012 Measured on recurring basis Dining Secretary USD ($) | Dec. 31, 2012 Measured on recurring basis Dining Secretary CNY | Dec. 31, 2013 Measured on recurring basis Happy City USD ($) | Dec. 31, 2013 Measured on recurring basis Happy City CNY | Dec. 31, 2013 Measured on recurring basis Financial products USD ($) | Dec. 31, 2013 Measured on recurring basis Financial products CNY | Dec. 31, 2012 Measured on recurring basis Financial products USD ($) | Dec. 31, 2012 Measured on recurring basis Financial products CNY | Dec. 31, 2013 Measured on recurring basis Time deposits USD ($) | Dec. 31, 2013 Measured on recurring basis Time deposits CNY | Dec. 31, 2012 Measured on recurring basis Time deposits USD ($) | Dec. 31, 2012 Measured on recurring basis Time deposits CNY | Dec. 31, 2013 Measured on recurring basis Quoted prices in active market for identical assets (Level 1) CNY | Dec. 31, 2012 Measured on recurring basis Quoted prices in active market for identical assets (Level 1) CNY | Dec. 31, 2013 Measured on recurring basis Quoted prices in active market for identical assets (Level 1) Hanting CNY | Dec. 31, 2012 Measured on recurring basis Quoted prices in active market for identical assets (Level 1) Hanting CNY | Dec. 31, 2013 Measured on recurring basis Significant other observable inputs (Level 2) CNY | Dec. 31, 2012 Measured on recurring basis Significant other observable inputs (Level 2) CNY | Dec. 31, 2013 Measured on recurring basis Significant other observable inputs (Level 2) Financial products CNY | Dec. 31, 2012 Measured on recurring basis Significant other observable inputs (Level 2) Financial products CNY | Dec. 31, 2013 Measured on recurring basis Significant other observable inputs (Level 2) Time deposits CNY | Dec. 31, 2012 Measured on recurring basis Significant other observable inputs (Level 2) Time deposits CNY | Dec. 31, 2013 Measured on recurring basis Unobservable inputs (Level 3) CNY | Dec. 31, 2012 Measured on recurring basis Unobservable inputs (Level 3) CNY | Dec. 31, 2013 Measured on recurring basis Unobservable inputs (Level 3) eHi CNY | Dec. 31, 2013 Measured on recurring basis Unobservable inputs (Level 3) Easy Go CNY | Dec. 31, 2013 Measured on recurring basis Unobservable inputs (Level 3) Dining Secretary CNY | Dec. 31, 2012 Measured on recurring basis Unobservable inputs (Level 3) Dining Secretary CNY | Dec. 31, 2013 Measured on recurring basis Unobservable inputs (Level 3) Happy City CNY
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Fair value measurement |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investment | $ 600,474,248 | 3,635,090,955 | 1,408,664,335 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 557,589,136 | 3,375,477,351 | $ 165,326,399 | 1,030,000,000 | $ 42,885,112 | 259,613,604 | $ 60,779,817 | 378,664,335 |  |  |  |  | 3,635,090,955 | 1,408,664,335 | 3,375,477,351 | 1,030,000,000 | 259,613,604 | 378,664,335 |  |  |  |  |  |  |
Available-for-sale investments |  |  |  | $ 168,000,000 | 1,000,000,000 | $ 901,932,558 | 5,460,029,129 | $ 329,760,222 | 2,054,439,158 | $ 167,906,530 | 1,016,455,767 | $ 93,985,763 | 585,540,705 | $ 94,318,772 | 570,977,550 | $ 23,771,275 | 143,904,165 | $ 9,290,577 | 56,242,365 | $ 9,668,243 | 60,234,118 | $ 6,171,156 | 37,358,327 |  |  |  |  |  |  |  |  | 1,016,455,767 | 585,540,705 | 1,016,455,767 | 585,540,705 |  |  |  |  |  |  | 808,482,407 | 60,234,118 | 570,977,550 | 143,904,165 | 56,242,365 | 60,234,118 | 37,358,327

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph g -Article 7 + Details
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