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Related Party Transactions - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2016	Mar. 24, 2016	Jun. 30, 2015
Related Party Transaction [Line Items]
Stock issued, aggregate value			$ 22,575,000
Liberty
Related Party Transaction [Line Items]
Common stock issued from treasury stock		264,841
Treasury stock reissued, price per share		$ 85.24
Stock issued, aggregate value		$ 23,000,000
Airplane One | Expedia, Inc
Related Party Transaction [Line Items]
Airplane ownership interest	50.00%
Airplane One | Iac
Related Party Transaction [Line Items]
Airplane ownership interest	50.00%
Aircraft
Related Party Transaction [Line Items]
Ownership interest of airplanes	$ 40,000,000	30,000,000
Airplane Two | Expedia, Inc
Related Party Transaction [Line Items]
Airplane ownership interest	50.00%
Airplane Two | Iac
Related Party Transaction [Line Items]
Airplane ownership interest	50.00%
Credit Facility
Related Party Transaction [Line Items]
Credit facility	$ 1,500,000,000
Reimbursement Agreement | Related Party
Related Party Transaction [Line Items]
Proceeds from reimbursement of expenses		$ 4,000,000
Reimbursement Agreement | Credit Facility | Related Party
Related Party Transaction [Line Items]
Credit facility					$ 1,500,000,000.0
7.456% Senior Notes Due 2018
Related Party Transaction [Line Items]
Senior notes, interest rate	7.456%	7.456%
5.95% Senior Notes Due 2020
Related Party Transaction [Line Items]
Senior notes, interest rate	5.95%	5.95%		5.95%
2.5% Senior Notes Due 2022
Related Party Transaction [Line Items]
Senior notes, interest rate	2.50%	2.50%		2.50%		2.50%
4.5% Senior Notes Due 2024
Related Party Transaction [Line Items]
Senior notes, interest rate	4.50%	4.50%		4.50%
5.0% Senior Notes Due 2026
Related Party Transaction [Line Items]
Senior notes, interest rate	5.00%	5.00%		5.00%

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Contractual interest rate for funds borrowed, under the debt agreement.

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