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Stock-Based Awards and Other Equity Instruments - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 01, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock reserved for new stock-based awards, shares 8,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized      
Total stock-based compensation $ 85,011,000us-gaap_ShareBasedCompensation $ 130,173,000us-gaap_ShareBasedCompensation $ 64,596,000us-gaap_ShareBasedCompensation  
Stock-based compensation tax benefit 20,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 17,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 19,000,000us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense  
Cash received from stock-based award exercises 101,000,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions 54,000,000us-gaap_EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions    
Income tax benefit associated with employees exercise of stock-based awards 69,000,000expe_CurrentIncomeTaxBenefitAssociatedWithStockBasedAwards 52,000,000expe_CurrentIncomeTaxBenefitAssociatedWithStockBasedAwards 64,000,000expe_CurrentIncomeTaxBenefitAssociatedWithStockBasedAwards  
Unrecognized stock-based compensation expense related to unvested stock-based awards 152,000,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized      
Unvested stock-based awards, which is expected to be recognized in expense weighted-average period (in years) 3 years      
Privately held warrants exercised     32,000,000expe_ClassOfWarrantOrRightExercisedInPeriod  
Common stock issued due to exercise of warrants     8,000,000expe_CommonStockIssuedDueToExerciseOfWarrants  
Weighted average exercise price of warrants     23.91expe_ClassOfWarrantOrRightWeightedAverageExercisePrice  
Total proceeds from exercise of warrants     191,000,000us-gaap_ProceedsFromWarrantExercises  
Employee Stock Purchase Plan Twenty Thirteen        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock purchase price as percentage of fair market value   85.00%us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent
/ us-gaap_PlanNameAxis
= expe_EmployeeStockPurchasePlanTwentyThirteenMember
   
Eligible employees contribution of base compensation   10.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate
/ us-gaap_PlanNameAxis
= expe_EmployeeStockPurchasePlanTwentyThirteenMember
   
Employee stock purchase plan, shares purchased 102,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= expe_EmployeeStockPurchasePlanTwentyThirteenMember
69,000us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans
/ us-gaap_PlanNameAxis
= expe_EmployeeStockPurchasePlanTwentyThirteenMember
   
Employee stock ownership plan, average purchase price of shares purchased $ 68.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_PlanNameAxis
= expe_EmployeeStockPurchasePlanTwentyThirteenMember
$ 46.31us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPerShareWeightedAveragePriceOfSharesPurchased
/ us-gaap_PlanNameAxis
= expe_EmployeeStockPurchasePlanTwentyThirteenMember
   
Shares of our common stock reserved for issuance 1,300,000us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
/ us-gaap_PlanNameAxis
= expe_EmployeeStockPurchasePlanTwentyThirteenMember
     
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock price, as of year end 85.36expe_StockPriceAsOfYearEnd
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
     
Total intrinsic value of stock options exercised, value 208,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
117,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
109,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
 
Restricted stock unit vested years 4 years      
RSUs        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total fair value of shares vested and released, value $ 12,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 29,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
$ 62,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
 
RSUs | Chief Executive Officer        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Performance-based restricted stock units outstanding       400,000expe_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedPerformanceBasedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefExecutiveOfficerMember
RSUs | Scenario 1        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock unit vested years 3 years      
RSUs | Scenario 2        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock unit vested years 4 years