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Significant Accounting Policies (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended |  |  |  |  | 12 Months Ended |  | 12 Months Ended
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Dec. 31, 2012 Segment Customers | Dec. 31, 2011 Customers | Dec. 31, 2010 | Dec. 31, 2012 Class B common stock [Member] | Dec. 31, 2011 Class B common stock [Member] | Dec. 21, 2011 Class B common stock [Member] | Dec. 20, 2011 Class B common stock [Member] | Dec. 31, 2012 Common Stock [Member] | Dec. 20, 2011 Common Stock [Member] | Dec. 31, 2012 Expedia [Member] | Dec. 31, 2011 Expedia [Member] | Dec. 31, 2010 Expedia [Member] | Dec. 31, 2012 Other Major Customer [Member] | Dec. 31, 2011 Other Major Customer [Member] | Dec. 31, 2010 Other Major Customer [Member] | Dec. 31, 2012 Stock Options [Member] | Dec. 31, 2012 Restricted Stock Units (RSU) [Member] | Dec. 31, 2012 Maximum [Member] | Dec. 31, 2012 Minimum [Member]
Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation over the estimated useful lives of the assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | P5Y | P3Y
Amortized estimated useful lives of Intangible assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10 years | 2 years
Stock options vest period |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years | 5 years |  |
Expected dividend yield on common stock |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |  |  |  |  |
Related party accounted for revenue, amount |  |  |  |  |  |  |  |  |  | 27.00% | 33.00% | 35.00% | 21.00% | 16.00% | 11.00% |  |  |  |
Common stock, shares outstanding |  |  |  | 12,799,999 | 12,799,999 | 12,799,999 | 12,799,999 |  | 120,661,020 |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies (Additional Textual) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Marketable debt securities with maturity | 90 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average maturity of total invested cash | 12 months |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Final maturity of marketable securities | 3 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts receivable due period | 30 days |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of reportable segment | 1 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum probability that the fair value of the reporting unit is less than the carrying amount | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign exchange losses | $ 3.2 | $ 1.0 | $ 1.6 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Advertising expense | $ 175.0 | $ 135.6 | $ 86.3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of customers accounting for more than 10% of gross trade receivables | 0 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Spin-Off reserve stock split of outstanding | 0.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted, period | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
TripAdvisor equity awards outstanding prior to Spin-Off |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Performance based options, bearing right to acquire common stock | 110,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock units, bearing right to acquire common stock | 200,000 | 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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