Organization and Basis of Presentation - Additional Information (Detail) - USD ($) $ / shares in Units, shares in Millions		1 Months Ended		6 Months Ended
	Apr. 14, 2014	Apr. 30, 2015	Nov. 30, 2014	Jun. 30, 2018	Dec. 31, 2017	Dec. 31, 2016
Organization And Basis Of Presentation [Line Items]
Common Stock, par value					$ 0.01	$ 0.01
La Quinta Holdings Inc. and Wyndham Worldwide Merger Agreement [Member] | Scenario Forecast [Member]
Organization And Basis Of Presentation [Line Items]
Disposal group including discontinued operation, cash consideration				$ 1,950,000,000
Common Stock, par value				$ 0.02
Disposal group including discontinued operation, sale price per share				$ 16.80
Disposal group including discontinued operation, consideration, repayment of debt				$ 715,000,000
Disposal group including discontinued operation, reserve for estimated taxes				240,000,000
Merger and separation agreement of cash payment				983,950,000
La Quinta Holdings Inc. and Wyndham Worldwide Merger Agreement [Member] | Scenario Forecast [Member] | JPMorgan Chase Bank [Member] | Secured Mortgage [Member]
Organization And Basis Of Presentation [Line Items]
Aggregate principal amount of debt				1,035,000,000
La Quinta Holdings Inc. and Wyndham Worldwide Merger Agreement [Member] | Scenario Forecast [Member] | JPMorgan Chase Bank [Member] | Secured Revolving Credit Facility [Member]
Organization And Basis Of Presentation [Line Items]
Aggregate principal amount of debt				$ 50,000,000
Blackstone [Member]
Organization And Basis Of Presentation [Line Items]
Percentage of common shares outstanding			45.20%		30.00%
IPO [Member]
Organization And Basis Of Presentation [Line Items]
Common stock shares, issued and sold	44.0
Secondary Offering [Member] | Blackstone [Member]
Organization And Basis Of Presentation [Line Items]
Common stock shares, issued and sold		23.9	23.0