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Computation of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Basic and Diluted: |  |  |  |
Net income attributable to UHS | $ 325,024 | $ 251,929 | $ 534,115 | $ 393,966
Less: Net income attributable to unvested restricted share grants | (661) | (824) | (1,213) | (1,197)
Net income attributable to UHS – basic and diluted | $ 324,363 | $ 251,105 | $ 532,902 | $ 392,769
Weighted average number of common shares - basic | 84,224 | 84,632 | 84,503 | 85,422
Net effect of dilutive stock options and grants based on the treasury stock method | 1,400 | 427 | 1,207 | 335
Weighted average number of common shares and equivalents - diluted | 85,624 | 85,059 | 85,710 | 85,757
Earnings per basic share attributable to UHS: | $ 3.85 | $ 2.97 | $ 6.31 | $ 4.60
Earnings per diluted share attributable to UHS: | $ 3.79 | $ 2.95 | $ 6.22 | $ 4.58

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