Supplemental Condensed Consolidating Financial Information and Other Collateral-Related Information - Schedule of Consolidated Statements of Stockholder's Deficit and Consolidated Statement of Cash Flows (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018 $ / shares
Cash dividends declared, per share	$ 1.40
Healthtrust, Inc. [Member]
Cash dividends declared, per share	$ 1.40