Commitments and Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2019 USD ($) LegalMatter	Dec. 31, 2018 USD ($)
Litigation relating to occupancy tax
Commitment And Contingencies [Line Items]
Number of lawsuits filed		101
Number of lawsuits currently active		11
Number of lawsuits dismissed to date		47
Number of dismissals based on finding that defendant was not subject to local hotel occupancy tax or the local government lacked standing to pursue claims		33
Reserve for legal contingencies | $		$ 66	$ 46
Travel Companies [Member]
Commitment And Contingencies [Line Items]
Pay-to-play occupancy refund received | $	$ 78
Interest received on pay-to-play payment refund received | $	$ 19