Related Party Transactions - Additional Information (Details) - $ / shares		9 Months Ended
	Jul. 26, 2019	Sep. 30, 2019	Jul. 25, 2019	Jul. 12, 2019	Apr. 30, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Common stock, voting power, percentage	50.00%	50.00%
Common stock, shares outstanding				136,832,712
Class B common stock
Related Party Transaction [Line Items]
Common stock, shares outstanding		5,523,000		12,799,999		12,800,000
Common stock, par value (in dollars per share)		$ 0.0001				$ 0.0001
Conversion of stock, shares issued (in shares)	5,523,452	5,500,000
Common stock
Related Party Transaction [Line Items]
Conversion of stock, shares issued (in shares)		140,000,000
Equity interest issued or issuable, number of shares	20,700,000
Liberty Expedia Holdings
Related Party Transaction [Line Items]
Ownership interest (in shares)			11,076,672
Common stock, voting power, percentage	20.00%		53.00%
Liberty Expedia Holdings | Class B common stock
Related Party Transaction [Line Items]
Ownership interest (in shares)			12,799,999
Liberty Expedia Holdings, LEMS I LLC | Class B common stock
Related Party Transaction [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
Liberty Expedia Holdings, LEMS I LLC | Common Class A
Related Party Transaction [Line Items]
Common stock, par value (in dollars per share)	$ 0.01
The Malone Group [Member]
Related Party Transaction [Line Items]
Common stock, voting power, percentage					32.00%
Agreement And Plan Of Merger
Related Party Transaction [Line Items]
Conversion of stock, shares issued (in shares)	0.36
Second Amended And Restated Governance Agreement Exchange With The Company Option
Related Party Transaction [Line Items]
Common stock, expected shares outstanding (in shares)	133,000,000
Conversion of stock, future exchange rights, maximum share amount	12,799,999
Second Amended And Restated Governance Agreement Purchase From The Company Option
Related Party Transaction [Line Items]
Common stock, expected shares outstanding (in shares)	140,000,000
Mr. Diller, Chairman | The Diller Foundation d/b/a The Diller - von Furstenberg Family Foundation | Class B common stock
Related Party Transaction [Line Items]
Common stock, voting power, percentage		28.00%
Mr. Diller, Chairman | The Diller Foundation d/b/a The Diller - von Furstenberg Family Foundation | Class B common stock | Maximum
Related Party Transaction [Line Items]
Common stock, voting power, percentage	5.00%
Mr. Diller, Chairman | The Diller Foundation d/b/a The Diller - von Furstenberg Family Foundation | Common stock
Related Party Transaction [Line Items]
Common stock, voting power, percentage		28.00%
Mr. Diller, Chairman | Second Amended And Restated Governance Agreement | Class B common stock
Related Party Transaction [Line Items]
Conversion of stock, future exchange rights, maximum share amount	7,276,547
Mr. Diller, Chairman | Second Amended And Restated Governance Agreement Exchange With The Company Option | Class B common stock
Related Party Transaction [Line Items]
Common stock, voting power, percentage	49.00%
Mr. Diller, Chairman | Second Amended And Restated Governance Agreement Purchase From The Company Option | The Diller Foundation d/b/a The Diller - von Furstenberg Family Foundation
Related Party Transaction [Line Items]
Common stock, voting power, percentage	48.00%
Mr. Diller, Chairman | Second Amended And Restated Governance Agreement Purchase From The Company Option | The Diller Foundation d/b/a The Diller - von Furstenberg Family Foundation | Class B common stock
Related Party Transaction [Line Items]
Conversion of stock, future exchange rights, maximum share amount	12,799,999
Mr. Diller, Chairman | Exchange Agreement | The Diller Foundation d/b/a The Diller - von Furstenberg Family Foundation
Related Party Transaction [Line Items]
Conversion of stock, shares issued (in shares)		5,500,000