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Quarterly Results (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Quarterly Financial Data [Line Items]                      
Net revenues $ 1,764,927 $ 1,680,353 $ 1,723,084 $ 1,793,036 $ 1,662,996 $ 1,662,675 $ 1,711,255 $ 1,723,296 $ 6,961,400 $ 6,760,222 $ 4,900,147
Net income 147,660 81,373 117,444 142,570 108,007 94,842 116,034 129,987 489,047 448,870 275,795
Less: Net income attributable to noncontrolling interests 12,199 9,556 9,883 13,963 12,736 9,788 12,385 15,794 45,601 50,703 45,612
Net income attributable to UHS $ 135,461 $ 71,817 $ 107,561 $ 128,607 $ 95,271 $ 85,054 $ 103,649 $ 114,193 $ 443,446 $ 398,167 $ 230,183
Earnings per basic share attributable to UHS: $ 1.39 $ 0.74 $ 1.11 $ 1.33 $ 0.99 $ 0.87 $ 1.06 $ 1.17 $ 4.57 $ 4.09 $ 2.37
Earnings per diluted share attributable to UHS: $ 1.39 $ 0.73 $ 1.10 $ 1.31 $ 0.98 $ 0.86 $ 1.04 $ 1.15 $ 4.53 $ 4.04 $ 2.34