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Segment Information - Additional Information (Detail) $ in Millions	5 Months Ended	12 Months Ended
	May 22, 2015 USD ($)	Dec. 31, 2017 Segment
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

X

- Definition

Sum of stock-based compensation and intangible amortization contained within standalone financial statements.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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Period Type:	duration

X

- Definition

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.

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: