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Stockholders Equity - Additional Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 12 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 05, 2015
Feb. 04, 2015
Dec. 31, 2010
Dec. 31, 2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Authorized share repurchase 60,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased   20,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased     20,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased 20,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Shares authorized and remaining under the repurchase program 1,800,000us-gaap_StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased            
Number of shares repurchased 7,040,621us-gaap_TreasuryStockSharesAcquired 9,259,400us-gaap_TreasuryStockSharesAcquired 10,690,657us-gaap_TreasuryStockSharesAcquired        
Total cost of repurchases $ 537,088us-gaap_TreasuryStockValueAcquiredCostMethod [1] $ 514,907us-gaap_TreasuryStockValueAcquiredCostMethod [1] $ 397,376us-gaap_TreasuryStockValueAcquiredCostMethod [1]        
Average repurchase price per share $ 76.26us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 55.59us-gaap_TreasuryStockAcquiredAverageCostPerShare $ 37.15us-gaap_TreasuryStockAcquiredAverageCostPerShare        
Class B Common Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, shares authorized 400,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 400,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		          
Common stock, par value $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		          
Number of voting rights to each shareholder, per share 10expe_NumberOfVotingRightsToEachShareholderPerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		            
Series A Preferred Stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Preferred stock outstanding 0us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		 0us-gaap_PreferredStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember		          
Common stock              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Common stock, shares authorized 1,600,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 1,600,000,000us-gaap_CommonStockSharesAuthorized
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		          
Common stock, par value $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 $ 0.0001us-gaap_CommonStockParOrStatedValuePerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		          
Number of voting rights to each shareholder, per share 1expe_NumberOfVotingRightsToEachShareholderPerShare
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		            
Total number of directors elected by holders of common stock, voting as single class, percentage 25.00%expe_TotalNumberOfDirectorsElectedByHoldersOfCommonStockVotingAsSingleClassPercentage
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		            
Subsequent Event              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Authorized share repurchase         10,000,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		    
Number of shares repurchased       500,000us-gaap_TreasuryStockSharesAcquired
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Total cost of repurchases       $ 44,000us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Average repurchase price per share       $ 85.25us-gaap_TreasuryStockAcquiredAverageCostPerShare
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		      
Subsequent Event | Dividend Declared              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Dividends declaration date         Feb. 04, 2015    
Dividends per share         $ 0.18us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_DividendsAxis
= us-gaap_DividendDeclaredMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember		    
Dividend payment date         Mar. 26, 2015    
Dividend record date         Mar. 10, 2015    
eLong              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Ownership interest percentage 64.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_BusinessAcquisitionAxis
= expe_ElongMember		 65.00%us-gaap_MinorityInterestOwnershipPercentageByParent
/ us-gaap_BusinessAcquisitionAxis
= expe_ElongMember		          
[1] Amount excludes transaction costs.