Condensed Consolidated Statements of Changes in Equity - USD ($) $ in Thousands	Total	Redeemable Noncontrolling Interest	Common Stock Class A	Common Stock Class B	Common Stock Class C	Common Stock Class D	Cumulative Dividends	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	UHS Common Stockholders' Equity	Noncontrolling Interest
Balance at Dec. 31, 2021	$ 6,193,053		$ 66	$ 698	$ 7	$ 0	$ (545,487)	$ 6,604,089	$ 30,291	$ 6,089,664	$ 103,389
Balance at Dec. 31, 2021		$ 5,119
Common Stock
Issued/(converted)	3,645			5				3,640		3,645
Repurchased	(365,505)			(27)				(365,478)		(365,505)
Restricted share-based compensation expense	3,442							3,442		3,442
Dividends paid and accrued	(14,963)						(14,963)			(14,963)
Stock option expense	15,202							15,202		15,202
Distributions to noncontrolling interests	(4,639)	(650)									(4,639)
Purchase (sale) of ownership interests by (from) minority members	(1,307)										(1,307)
Comprehensive income:
Net income to UHS / noncontrolling interests	151,176	(155)						153,913		153,913	(2,737)
Foreign currency translation adjustments, net of income tax	(17,526)								(17,526)	(17,526)
Subtotal - comprehensive income	133,650							153,913	(17,526)	136,387	(2,737)
Subtotal attributable to redeemable noncontrolling interest		(155)
Balance at Mar. 31, 2022	5,962,578		66	676	7	0	(560,450)	6,414,808	12,765	5,867,872	94,706
Balance at Mar. 31, 2022		4,314
Balance at Dec. 31, 2022	5,965,350		66	637	7	0	(604,127)	6,533,667	(9,668)	5,920,582	44,768
Balance at Dec. 31, 2022		4,695
Common Stock
Issued/(converted)	3,095			3				3,092		3,095
Repurchased	(85,826)			(7)				(85,819)		(85,826)
Restricted share-based compensation expense	4,494							4,494		4,494
Dividends paid and accrued	(14,199)						(14,199)			(14,199)
Stock option expense	16,225							16,225		16,225
Distributions to noncontrolling interests	(3,395)	(750)									(3,395)
Comprehensive income:
Net income to UHS / noncontrolling interests	162,051	324						163,115		163,115	(1,064)
Foreign currency translation adjustments, net of income tax	4,622								4,622	4,622
Subtotal - comprehensive income	166,673							163,115	4,622	167,737	(1,064)
Subtotal attributable to redeemable noncontrolling interest		324
Balance at Mar. 31, 2023	6,052,417		$ 66	$ 633	$ 7	$ 0	$ (618,326)	$ 6,634,774	$ (5,046)	$ 6,012,108	$ 40,309
Balance at Mar. 31, 2023	$ 4,000	$ 4,269