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SHARE-BASED COMPENSATION (Narrative) (Details)
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1 Months Ended | 12 Months Ended | 12 Months Ended | 1 Months Ended | 0 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | 12 Months Ended | ||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
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Dec. 31, 2012
CNY
Rate
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Dec. 31, 2013
USD ($)
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Dec. 31, 2013
CNY
|
Dec. 31, 2012
USD ($)
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Dec. 31, 2012
CNY
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Dec. 31, 2011
USD ($)
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Dec. 31, 2011
CNY
|
Dec. 31, 2013
Cash-settled performance units [Member]
CNY
|
Dec. 31, 2012
Cash-settled performance units [Member]
CNY
|
Dec. 31, 2012
Equity-settled performance units [Member]
CNY
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Sep. 30, 2013
Equity-settled performance units [Member]
Management [Member]
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Sep. 30, 2013
Equity-settled performance units [Member]
Management [Member]
Annually Vesting [Member]
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Sep. 30, 2013
Equity-settled performance units [Member]
Management [Member]
Vesting Depedent On Performance Targets [Member]
increments
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Aug. 04, 2004
Expedia [Member]
USD ($)
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Dec. 31, 2013
Expedia [Member]
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Dec. 31, 2013
Minimum [Member]
Equity-settled performance units [Member]
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Dec. 31, 2013
Maximum [Member]
Equity-settled performance units [Member]
|
Dec. 31, 2013
Ordinary shares [Member]
USD ($)
|
Dec. 31, 2013
ADS [Member]
USD ($)
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Dec. 31, 2013
2001 Plan [Member]
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Aug. 26, 2003
2001 Plan [Member]
Ordinary shares [Member]
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Apr. 30, 2001
2001 Plan [Member]
Ordinary shares [Member]
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Dec. 31, 2012
2004 Plan [Member]
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Dec. 31, 2013
2004 Plan [Member]
Cash-settled performance units [Member]
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Dec. 31, 2013
2004 Plan [Member]
Minimum [Member]
|
Dec. 31, 2013
2004 Plan [Member]
Maximum [Member]
|
Jul. 31, 2004
2004 Plan [Member]
Ordinary shares [Member]
|
Dec. 31, 2013
2009 Plan [Member]
|
Dec. 31, 2012
2009 Plan [Member]
|
Dec. 31, 2013
2009 Plan [Member]
Equity-settled performance units [Member]
|
Dec. 31, 2012
2009 Plan [Member]
Equity-settled performance units [Member]
|
Dec. 31, 2013
2009 Plan [Member]
Minimum [Member]
|
Dec. 31, 2013
2009 Plan [Member]
Maximum [Member]
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Sep. 18, 2013
2009 Plan [Member]
Ordinary shares [Member]
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Apr. 24, 2012
2009 Plan [Member]
Ordinary shares [Member]
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Mar. 17, 2011
2009 Plan [Member]
Ordinary shares [Member]
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May 31, 2009
2009 Plan [Member]
Ordinary shares [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||||||||||||||||||||||
| Shares available for grant | 5,500,000 | 4,000,000 | 4,000,000 | 17,000,000 | 12,000,000 | 6,000,000 | 3,000,000 | ||||||||||||||||||||||||||||||
| Stock option expiration period | 10 years | 5 years | 10 years | 5 years | |||||||||||||||||||||||||||||||||
| Option to performance unit exchange ratio | 0.8 | ||||||||||||||||||||||||||||||||||||
| Vesting period for plan | 2 years | 5 years | 2 years | 5 years | 3 years | 5 years | 3 years | 5 years | |||||||||||||||||||||||||||||
| Vesting increments | 3 | ||||||||||||||||||||||||||||||||||||
| Fair value of options vested | $ 849,758 | 5,144,179 | 15,790,217 | 10,069,531 | |||||||||||||||||||||||||||||||||
| Options cancelled | 302,762 | 1,158,984 | |||||||||||||||||||||||||||||||||||
| Price per share | $ 10.24 | $ 20.48 | |||||||||||||||||||||||||||||||||||
| Intrinsic value of stock options exercised | 3,000,000 | 1,600,000 | 15,300,000 | ||||||||||||||||||||||||||||||||||
| Options granted | 711,429 | ||||||||||||||||||||||||||||||||||||
| Options granted, exercise price | $ 5.25 | ||||||||||||||||||||||||||||||||||||
| Options exercised, forfeited or expired | 707,143 | ||||||||||||||||||||||||||||||||||||
| Stock options outstanding | 4,286 | ||||||||||||||||||||||||||||||||||||
| Accrued expenses and other current liabilities | 198,970,866 | 55,817,679 | 337,903,480 | 198,970,866 | 127,803,167 | 1,574,681 | 892,697 | ||||||||||||||||||||||||||||||
| Granted | 1,848,210 | 6,300,000 | 32,004 | 6,566,627 | 1,169,406 | ||||||||||||||||||||||||||||||||
| Incremental share-based compensation cost | 22,214,132 | ||||||||||||||||||||||||||||||||||||
| Fair value of performance units, vested | 33,268,711 | 6,830,623 | 8,714,416 | ||||||||||||||||||||||||||||||||||
| Cash paid to settle performance units | 816,978 | 948,780 | 1,149,517 | ||||||||||||||||||||||||||||||||||
| Unrecognized compensation cost related to non-vested stock options | 70,657,237 | 297,229,308 | 70,657,237 | ||||||||||||||||||||||||||||||||||
| Unrecognized compensation cost, recognition period | 3 years 2 months 16 days | 3 years 2 months 16 days | |||||||||||||||||||||||||||||||||||