Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

No definition available.

Name:	us-gaap_NumberOfReportableSegments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

Segment Information - Additional Information (Detail) $ in Millions	3 Months Ended	5 Months Ended	12 Months Ended
	Mar. 31, 2015 Segment	May 22, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment	4
eLong, Inc
Segment Reporting Information [Line Items]
Stock-based compensation and intangible amortization \| $		$ 20	$ 17