Segment Information - Additional Information (Detail) $ in Millions |
3 Months Ended | 6 Months Ended | |||
---|---|---|---|---|---|
Jun. 30, 2015
USD ($)
|
Mar. 31, 2015
Segment
|
Jun. 30, 2014
USD ($)
|
Jun. 30, 2015
USD ($)
|
Jun. 30, 2014
USD ($)
|
|
Segment Reporting Information [Line Items] | |||||
Number of reportable segments | 4 | ||||
eLong, Inc | |||||
Segment Reporting Information [Line Items] | |||||
stock based compensation and intangible amortization | $ | $ 15 | $ 6 | $ 20 | $ 11 |