Income Taxes - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended
	Jan. 31, 2017	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Taxes [Line Items]
Effective tax rate		76.20%	48.00%
Income tax expense at federal statutory rate		21.00%		35.00%
Incremental transition tax expense		$ 5,000,000
Tax cuts and jobs act, income tax benefit		1,000,000
Accrued interest		11,000,000
Accrued penalties		0
Tax benefit from subsidiary		$ 1,000,000	$ 1,000,000
Minimum | Expedia | IRS | Tax Years 2009 and 2010
Income Taxes [Line Items]
Increase in income tax expense due to proposed adjustments related to transfer pricing with foreign subsidiary, estimated	$ 10,000,000
Maximum | Expedia | IRS | Tax Years 2009 and 2010
Income Taxes [Line Items]
Increase in income tax expense due to proposed adjustments related to transfer pricing with foreign subsidiary, estimated	$ 14,000,000