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Long Term Debt Outstanding (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]    
Long-term debt $ 1,746,787us-gaap_LongTermDebtNoncurrent $ 1,249,412us-gaap_LongTermDebtNoncurrent
7.456% Senior Notes Due 2018    
Debt Instrument [Line Items]    
Long-term debt 500,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= expe_SevenPointFourFiveSixPercentSeniorNotesDueOnTwoZeroOneEightMember		 500,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= expe_SevenPointFourFiveSixPercentSeniorNotesDueOnTwoZeroOneEightMember
5.95% Senior Notes Due 2020    
Debt Instrument [Line Items]    
Long-term debt 749,485us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= expe_FivePointNineFivePercentSeniorNotesDueOnTwoZeroTwoZeroMember		 749,412us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= expe_FivePointNineFivePercentSeniorNotesDueOnTwoZeroTwoZeroMember
4.5% Senior Notes Due 2024    
Debt Instrument [Line Items]    
Long-term debt $ 497,302us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= expe_FourPointFivePercentSeniorNotesDueOnTwoZeroTwoFourMember