Commitments and Contingencies - Additional Information (Detail) $ in Millions		1 Months Ended		12 Months Ended
	May 15, 2017 USD ($)	Sep. 30, 2015 USD ($)	May 31, 2014 USD ($)	Dec. 31, 2018 USD ($) LegalMatter	Dec. 31, 2013 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items]
Reserve for legal contingencies				$ 46.0			$ 43.0
Litigation relating to occupancy tax
Loss Contingencies [Line Items]
Number of lawsuits filed by cities, counties and states involving hotel occupancy taxes | LegalMatter				101
Number of lawsuits currently active | LegalMatter				15
Number of lawsuits dismissed to date | LegalMatter				45
Dismissal based in finding not subject to tax | LegalMatter				31
Hawaii | Litigation Related to Other Taxes
Loss Contingencies [Line Items]
Pay-to-play occupancy and other tax payments	$ 16.7				$ 171.0
Tax refunds received		$ 132.0
Tax paid, net of refunds				$ 44.0
Hawaii | Litigation Related to Other Taxes | Orbitz Worldwide, Inc.
Loss Contingencies [Line Items]
Tax refunds received		$ 22.0
City of San Francisco
Loss Contingencies [Line Items]
Pay-to-play occupancy and other tax payments			$ 25.5			$ 48.0
Occupancy and other tax assessment refund received				78.0
Occupancy and other tax assessment refund received, interest				19.0
City of San Francisco | Orbitz Worldwide, Inc.
Loss Contingencies [Line Items]
Payments for occupancy and other tax assessments				$ 4.6