Effects of Changes in Noncontrolling Interest (Parenthetical) (Detail) In Millions, unless otherwise specified	9 Months Ended
Sep. 30, 2011
Elong
Noncontrolling Interest [Line Items]
Additional ownership interest purchased, shares	5.4
Tencent Holdings
Noncontrolling Interest [Line Items]
Additional ownership interest purchased, shares	11.1

Noncontrolling Interest, Change in Stock Issuance Shares

No definition available.

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Namespace Prefix:	expe_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration