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Computation of Basic and Diluted Earnings Per Share for classes A, B, C and D Common Stockholders (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Basic and Diluted:    
Net income attributable to UHS $ 190,759 $ 174,299
Less: Net income attributable to unvested restricted share grants (89) (68)
Net income attributable to UHS – basic and diluted $ 190,670 $ 174,231
Weighted average number of common shares - basic 97,607 98,910
Net effect of dilutive stock options and grants based on the treasury stock method 1,288 1,737
Weighted average number of common shares and equivalents - diluted 98,895 100,647
Earnings per basic share attributable to UHS: $ 1.95 $ 1.76
Earnings per diluted share attributable to UHS: $ 1.93 $ 1.73