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Significant Accounting Policies - Common Shares Related to Stock Options, Stock Warrants and RSUs Excluded from Calculated Diluted EPS (Parenthetical) (Detail)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Total Performance based options and restricted stock units, bearing right to acquire common stock 66,666trip_PerformanceBasedRestrictedStockUnitsAndOptionsNumberOfSecuritiesCalledByOptionsAndRestrictedStockUnits 155,000trip_PerformanceBasedRestrictedStockUnitsAndOptionsNumberOfSecuritiesCalledByOptionsAndRestrictedStockUnits 110,000trip_PerformanceBasedRestrictedStockUnitsAndOptionsNumberOfSecuritiesCalledByOptionsAndRestrictedStockUnits
Antidilutive securities excluded from computation of earnings per share, amount 1,641,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount [1] 2,271,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount [2] 3,965,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount [3]
Performance Shares      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share, amount 110,666us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 199,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember		 310,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AwardTypeAxis
= us-gaap_PerformanceSharesMember
Restricted Stock Units      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Antidilutive securities excluded from computation of earnings per share, amount 191,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [1] 27,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [2] 21,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember		 [3]
Restricted stock units, bearing right to acquire common stock 44,000trip_PerformanceBasedRestrictedStockUnitsNumberOfSecuritiesCalledByRestrictedStockUnits
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember		 44,000trip_PerformanceBasedRestrictedStockUnitsNumberOfSecuritiesCalledByRestrictedStockUnits
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember		 200,000trip_PerformanceBasedRestrictedStockUnitsNumberOfSecuritiesCalledByRestrictedStockUnits
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_RestrictedStockUnitsRSUMember
[1] These totals do not include 66,666 performance based options and 44,000 performance based RSUs representing the right to acquire 110,666 shares of common stock for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.
[2] These totals do not include 155,000 performance based options and 44,000 performance based RSUs representing the right to acquire 199,000 shares of common stock for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.
[3] These totals do not include 110,000 performance based options and 200,000 performance based RSUs representing the right to acquire 310,000 shares of common stock, respectively, for which all targets required to trigger vesting had not been achieved; therefore, such awards were excluded from the calculation of weighted average shares used to compute Diluted EPS for those reporting periods.