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Earnings per share - Reconciliations of Numerators and Denominators Used to Calculate Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Earnings Per Share [Abstract] |  |  |  |
Net income from continuing operations | $ 73,371 | $ 152,870 | $ 463,989 | $ 745,067
Change in noncontrolling interest redemption rights in excess of fair value | 98 | 0 | 0 | 0
Net income from continuing operations for basic earnings per share calculation | 73,469 | 152,870 | 463,989 | 745,067
Net (loss) income from discontinued operations | (210,167) | (367,346) | (154,823) | (384,845)
Net income (loss) attributable to DaVita Inc. for basic earnings per share calculation | $ (136,698) | $ (214,476) | $ 309,166 | $ 360,222
Basic: |  |  |  |
Weighted Average Number of Shares Issued, Basic | 166,819 | 191,078 | 173,875 | 192,964
Contingently returnable shares held in escrow from the DaVita HealthCare Partners merger (in shares) | (48) | (2,194) | (1,471) | (2,194)
Weighted average shares for basic earnings per share calculation (in shares) | 166,771 | 188,884 | 172,404 | 190,770
Basic net income from continuing operations per share attributable to DaVita Inc. | $ 0.44 | $ 0.81 | $ 2.69 | $ 3.91
Basic net (loss) income from discontinued operations per share attributable to DaVita Inc. | (1.26) | (1.95) | (0.90) | (2.02)
Basic net (loss) income per share attributable to DaVita Inc. (usd per share) | $ (0.82) | $ (1.14) | $ 1.79 | $ 1.89
Diluted: |  |  |  |
Weighted Average Number of Shares Issued, Basic | 166,819 | 191,078 | 173,875 | 192,964
Assumed incremental shares from stock plans (in shares) | 443 | 330 | 473 | 582
Weighted average shares for diluted earnings per share calculation (in shares) | 167,262 | 191,408 | 174,348 | 193,546
Diluted net income from continuing operations per share attributable to DaVita Inc. | $ 0.44 | $ 0.80 | $ 2.66 | $ 3.85
Discontinued Operation, Income (Loss) from Discontinued Operation, Net of Tax, Per Diluted Share | (1.26) | (1.92) | (0.89) | (1.99)
Diluted net (loss) income per share attributable to DaVita Inc. (usd per share) | $ (0.82) | $ (1.12) | $ 1.77 | $ 1.86
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 5,281 | 5,201 | 4,987 | 5,239

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- Definition The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1505-109256 + Details
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- Definition Shares issuable for little or no cash consideration upon the satisfaction of certain conditions (contingently issuable shares) are considered outstanding common shares and included in the computation of basic Earnings Per Share as of the date that all necessary conditions have been satisfied (in essence, when issuance of the shares is no longer contingent). Outstanding common shares that are contingently returnable (that is, subject to recall) are treated in the same manner as contingently issuable shares. Contingently issuable shares include shares that (a) will be issued in the future upon the satisfaction of specified conditions, (b) have been placed in escrow and all or part must be returned if specified conditions are not met, or (c) have been issued but the holder must return all or part if specified conditions are not met. The number of contingently issuable shares is determined by relating the portion of time within a reporting period that these shares have been outstanding to the total time in that period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e2646-109256 + Details
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- Definition This element represents the weighted average total number of shares issued throughout the period including the first (beginning balance outstanding) and last (ending balance outstanding) day of the period before considering any reductions (for instance, shares held in treasury) to arrive at the weighted average number of shares outstanding. Weighted average relates to the portion of time within a reporting period that common shares have been issued and outstanding to the total time in that period. Such concept is used in determining the weighted average number of shares outstanding for purposes of calculating earnings per share (basic). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1448-109256 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e2646-109256 + Details
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- Definition Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=109260490&loc=d3e1448-109256 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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