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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 | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Basic and diluted: |  |  |  |  |  |  |  |  |  |  |
Net Income | $ 225,035 | $ 145,362 | $ 190,388 | $ 210,527 | $ 178,738 | $ 157,265 | $ 195,449 | $ 215,719 | $ 771,312 | $ 747,171 | $ 750,698
Less: Net income attributable to noncontrolling interest | $ (5,426) | $ (4,117) | $ (4,994) | $ (4,472) | $ (4,530) | $ (5,400) | $ (9,872) | $ (24,960) | (19,009) | (44,762) | (70,170)
Less: Net income attributable to unvested restricted share grants |  |  |  |  |  |  |  |  | (362) | (314) | (281)
Net income attributable to UHS—basic and diluted |  |  |  |  |  |  |  |  | $ 751,941 | $ 702,095 | $ 680,247
Weighted average number of common shares—basic |  |  |  |  |  |  |  |  | 95,652 | 97,208 | 98,797
Total basic earnings per share | $ 2.32 | $ 1.48 | $ 1.93 | $ 2.13 | $ 1.80 | $ 1.56 | $ 1.91 | $ 1.95 | $ 7.86 | $ 7.22 | $ 6.89
Weighted average number of common shares—basic |  |  |  |  |  |  |  |  | 95,652 | 97,208 | 98,797
Net effect of dilutive stock options and grants based on the treasury stock method |  |  |  |  |  |  |  |  | 673 | 1,172 | 1,897
Weighted average number of common shares and equivalents?diluted |  |  |  |  |  |  |  |  | 96,325 | 98,380 | 100,694
Total diluted earnings per share | $ 2.31 | $ 1.47 | $ 1.91 | $ 2.12 | $ 1.78 | $ 1.54 | $ 1.89 | $ 1.93 | $ 7.81 | $ 7.14 | $ 6.76

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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=96948231&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96947427&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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