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Summary of Dividends Declared (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dividends Payable [Line Items]      
Payment of dividends to stockholders $ 84,697us-gaap_PaymentsOfOrdinaryDividends $ 75,760us-gaap_PaymentsOfOrdinaryDividends $ 130,423us-gaap_PaymentsOfOrdinaryDividends
February 5, 2014      
Dividends Payable [Line Items]      
Declaration Date Feb. 05, 2014    
Dividend Per Share $ 0.15us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_DividendsAxis
= expe_DeclarationDate1Member		    
Record Date Mar. 10, 2014    
Payment of dividends to stockholders 19,602us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_DividendsAxis
= expe_DeclarationDate1Member		    
Payment Date Mar. 27, 2014    
April 30, 2014      
Dividends Payable [Line Items]      
Declaration Date Apr. 30, 2014    
Dividend Per Share $ 0.15us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_DividendsAxis
= expe_DeclarationDate2Member		    
Record Date May 30, 2014    
Payment of dividends to stockholders 19,231us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_DividendsAxis
= expe_DeclarationDate2Member		    
Payment Date Jun. 19, 2014    
July 30, 2014      
Dividends Payable [Line Items]      
Declaration Date Jul. 30, 2014    
Dividend Per Share $ 0.18us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_DividendsAxis
= expe_DeclarationDate3Member		    
Record Date Aug. 27, 2014    
Payment of dividends to stockholders 22,944us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_DividendsAxis
= expe_DeclarationDate3Member		    
Payment Date Sep. 17, 2014    
October 27, 2014      
Dividends Payable [Line Items]      
Declaration Date Oct. 27, 2014    
Dividend Per Share $ 0.18us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_DividendsAxis
= expe_DeclarationDate4Member		    
Record Date Nov. 20, 2014    
Payment of dividends to stockholders 22,920us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_DividendsAxis
= expe_DeclarationDate4Member		    
Payment Date Dec. 11, 2014    
February 5, 2013      
Dividends Payable [Line Items]      
Declaration Date   Feb. 05, 2013  
Dividend Per Share   $ 0.13us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_DividendsAxis
= expe_DeclarationDate5Member		  
Record Date   Mar. 11, 2013  
Payment of dividends to stockholders   17,983us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_DividendsAxis
= expe_DeclarationDate5Member		  
Payment Date   Mar. 28, 2013  
April 24, 2013      
Dividends Payable [Line Items]      
Declaration Date   Apr. 24, 2013  
Dividend Per Share   $ 0.13us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_DividendsAxis
= expe_DeclarationDate6Member		  
Record Date   May 30, 2013  
Payment of dividends to stockholders   17,638us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_DividendsAxis
= expe_DeclarationDate6Member		  
Payment Date   Jun. 19, 2013  
July 24, 2013      
Dividends Payable [Line Items]      
Declaration Date   Jul. 24, 2013  
Dividend Per Share   $ 0.15us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_DividendsAxis
= expe_DeclarationDateSevenMember		  
Record Date   Aug. 28, 2013  
Payment of dividends to stockholders   20,459us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_DividendsAxis
= expe_DeclarationDateSevenMember		  
Payment Date   Sep. 18, 2013  
October 28, 2013      
Dividends Payable [Line Items]      
Declaration Date   Oct. 28, 2013  
Dividend Per Share   $ 0.15us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_DividendsAxis
= expe_DeclarationDateEightMember		  
Record Date   Nov. 21, 2013  
Payment of dividends to stockholders   19,680us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_DividendsAxis
= expe_DeclarationDateEightMember		  
Payment Date   Dec. 12, 2013  
February 9, 2012      
Dividends Payable [Line Items]      
Declaration Date     Feb. 09, 2012
Dividend Per Share     $ 0.09us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_DividendsAxis
= expe_DeclarationDateNineMember
Record Date     Mar. 12, 2012
Payment of dividends to stockholders     12,204us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_DividendsAxis
= expe_DeclarationDateNineMember
Payment Date     Mar. 30, 2012
April 25, 2012      
Dividends Payable [Line Items]      
Declaration Date     Apr. 25, 2012
Dividend Per Share     $ 0.09us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_DividendsAxis
= expe_DeclarationDateTenMember
Record Date     May 30, 2012
Payment of dividends to stockholders     12,205us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_DividendsAxis
= expe_DeclarationDateTenMember
Payment Date     Jun. 19, 2012
July 25, 2012      
Dividends Payable [Line Items]      
Declaration Date     Jul. 25, 2012
Dividend Per Share     $ 0.13us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_DividendsAxis
= expe_DeclarationDateElevenMember
Record Date     Aug. 28, 2012
Payment of dividends to stockholders     18,061us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_DividendsAxis
= expe_DeclarationDateElevenMember
Payment Date     Sep. 18, 2012
October 24, 2012      
Dividends Payable [Line Items]      
Declaration Date     Oct. 24, 2012
Dividend Per Share     $ 0.13us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_DividendsAxis
= expe_DeclarationDateTwelveMember
Record Date     Nov. 16, 2012
Payment of dividends to stockholders     17,658us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_DividendsAxis
= expe_DeclarationDateTwelveMember
Payment Date     Dec. 07, 2012
December 7, 2012      
Dividends Payable [Line Items]      
Declaration Date     Dec. 07, 2012
Dividend Per Share     $ 0.52us-gaap_CommonStockDividendsPerShareCashPaid
/ us-gaap_DividendsAxis
= expe_DeclarationDateThirteenMember
Record Date     Dec. 17, 2012
Payment of dividends to stockholders     $ 70,295us-gaap_PaymentsOfOrdinaryDividends
/ us-gaap_DividendsAxis
= expe_DeclarationDateThirteenMember
Payment Date     Dec. 28, 2012