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, 2023	$ 6,196,715		$ 66	$ 599	$ 7	$ 0	$ (659,890)	$ 6,798,930	$ 9,289	$ 6,149,001	$ 47,714
Balance at Dec. 31, 2023		$ 5,191
Common Stock
Issued/(converted)	11,031			11				11,020		11,031
Repurchased, including excise tax	(424,077)			(21)				(424,056)		(424,077)
Restricted share-based compensation expense	30,746							30,746		30,746
Dividends paid and accrued	(40,597)						(40,597)			(40,597)
Stock option expense	41,025							41,025		41,025
Distributions to noncontrolling interests	(5,142)	(649)									(5,142)
Purchase (sale) of ownership interests by (from) minority members	17,537										17,537
Comprehensive income:
Net income (loss) to UHS / noncontrolling interests	824,981	1,081						809,700		809,700	15,281
Other								(17)	17
Foreign currency translation adjustments, net of income tax	28,867								28,867	28,867
Subtotal - comprehensive income	853,848							809,683	28,884	838,567	15,281
Subtotal attributable to redeemable noncontrolling interest		1,081
Balance at Sep. 30, 2024	6,681,086		66	589	7	0	(700,487)	7,267,348	38,173	6,605,696	75,390
Balance at Sep. 30, 2024		5,623
Balance at Jun. 30, 2024	6,550,805		66	594	7	0	(687,015)	7,162,908	8,812	6,485,372	65,433
Balance at Jun. 30, 2024		5,418
Common Stock
Issued/(converted)	3,637			3				3,634		3,637
Repurchased, including excise tax	(184,139)			(8)				(184,131)		(184,139)
Restricted share-based compensation expense	12,867							12,867		12,867
Dividends paid and accrued	(13,472)						(13,472)			(13,472)
Stock option expense	13,356							13,356		13,356
Distributions to noncontrolling interests	(702)										(702)
Purchase (sale) of ownership interests by (from) minority members	3,668										3,668
Comprehensive income:
Net income (loss) to UHS / noncontrolling interests	265,705	205						258,714		258,714	6,991
Foreign currency translation adjustments, net of income tax	29,361								29,361	29,361
Subtotal - comprehensive income	295,066							258,714	29,361	288,075	6,991
Subtotal attributable to redeemable noncontrolling interest		205
Balance at Sep. 30, 2024	6,681,086		66	589	7	0	(700,487)	7,267,348	38,173	6,605,696	75,390
Balance at Sep. 30, 2024		5,623
Balance at Dec. 31, 2024	6,749,523		66	577	7	0	(713,705)	7,372,061	7,201	6,666,207	83,316
Balance at Dec. 31, 2024		13,293
Common Stock
Issued/(converted)	12,298			9				12,289		12,298
Repurchased, including excise tax	(620,763)			(35)				(620,728)		(620,763)
Restricted share-based compensation expense	43,722							43,722		43,722
Dividends paid and accrued	(39,067)						(39,067)			(39,067)
Stock option expense	25,671							25,671		25,671
Reclass of noncontrolling interests to redeemable noncontrolling interests	(38,523)	38,523									(38,523)
Change in redemption amount of redeemable noncontrolling interest	(2,312)	2,312						(2,312)		(2,312)
Distributions to noncontrolling interests	(8,016)	(2,395)									(8,016)
Purchase (sale) of ownership interests by (from) minority members	10,150	8,635									10,150
Comprehensive income:
Net income (loss) to UHS / noncontrolling interests	1,056,732	6,614						1,042,855		1,042,855	13,877
Foreign currency translation adjustments, net of income tax	41,082								41,082	41,082
Subtotal - comprehensive income	1,097,814							1,042,855	41,082	1,083,937	13,877
Subtotal attributable to redeemable noncontrolling interest		6,614
Balance at Sep. 30, 2025	7,230,497		66	551	7	0	(752,772)	7,873,558	48,283	7,169,693	60,804
Balance at Sep. 30, 2025	67,000	66,982
Balance at Jun. 30, 2025	7,085,513		66	564	7	0	(740,083)	7,711,745	57,749	7,030,048	55,465
Balance at Jun. 30, 2025		59,569
Common Stock
Issued/(converted)	3,983			1				3,982		3,983
Repurchased, including excise tax	(239,673)			(14)				(239,659)		(239,673)
Restricted share-based compensation expense	16,410							16,410		16,410
Dividends paid and accrued	(12,689)						(12,689)			(12,689)
Stock option expense	8,123							8,123		8,123
Distributions to noncontrolling interests	(789)										(789)
Purchase (sale) of ownership interests by (from) minority members	2,989	4,403									2,989
Comprehensive income:
Net income (loss) to UHS / noncontrolling interests	376,096	3,010						372,957		372,957	3,139
Foreign currency translation adjustments, net of income tax	(9,466)								(9,466)	(9,466)
Subtotal - comprehensive income	366,630							372,957	(9,466)	363,491	3,139
Subtotal attributable to redeemable noncontrolling interest		3,010
Balance at Sep. 30, 2025	7,230,497		$ 66	$ 551	$ 7	$ 0	$ (752,772)	$ 7,873,558	$ 48,283	$ 7,169,693	$ 60,804
Balance at Sep. 30, 2025	$ 67,000	$ 66,982