Discontinued Operations - Additional Information (Detail) - USD ($)		9 Months Ended
	May 30, 2018	Sep. 30, 2018	Dec. 31, 2017
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Stockholders' equity, reverse stock split		as of May 18, 2018, received one share of CorePoint common stock for each share of LQH Parent common stock held after giving effect to the Reverse Stock Split
Common Stock, par value	$ 0.01	$ 0.01	$ 0.01
LQH Parent [Member]
Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items]
Stockholders' equity, reverse stock split		Each holder of LQH Parent common stock received one share of CorePoint common stock for each share of LQH Parent common stock.
Common Stock, par value	0.02
Disposal group including discontinued operation merger consideration 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	$ 240,000,000
Gain or loss on separation of disposed net assets and liabilities		0
Adjustment in stockholders’ equity		740,000,000
Cash payment in connection with spin-off		$ 1,000,000,000