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Changes in Carrying Value of Goodwill by Reportable Segments (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Goodwill [Line Items] |  |  |  |
Beginning balance |  | $ 9,294,479 | $ 9,415,295 |
Acquisitions |  | 447,828 | 97,093 |
Divestitures |  | (44,759) | (8,781) |
Goodwill impairment charges |  | (281,415) | (192,834) | $ (1,000)
Foreign currency and other adjustments |  | (8,816) | (16,294) |
Ending balance | $ 9,294,479 | 9,407,317 | 9,294,479 | 9,415,295
Goodwill |  | 9,883,410 |  |
Accumulated impairment charges |  | (476,093) |  |
U.S. Dialysis And Related Lab Services |  |  |  |
Goodwill [Line Items] |  |  |  |
Beginning balance |  | 5,629,183 | 5,610,643 |
Acquisitions |  | 75,295 | 21,910 |
Divestitures |  | (12,891) | (3,370) |
Ending balance | 5,629,183 | 5,691,587 | 5,629,183 | 5,610,643
Goodwill |  | 5,691,587 |  |
DaVita Medical Group (DMG) |  |  |  |
Goodwill [Line Items] |  |  |  |
Beginning balance |  | 3,398,264 | 3,562,534 |
Acquisitions |  | 248,901 | 29,910 |
Divestitures |  | (2,223) | (5,411) |
Goodwill impairment charges | (188,769) | (253,000) | (188,769) |
Ending balance | 3,398,264 | 3,391,942 | 3,398,264 | 3,562,534
Goodwill |  | 3,833,711 |  |
Accumulated impairment charges |  | (441,769) |  |
Other ancillary services and strategic initiatives |  |  |  |
Goodwill [Line Items] |  |  |  |
Beginning balance |  | 267,032 | 242,118 |
Acquisitions |  | 123,632 | 45,273 |
Divestitures |  | (29,645) |  |
Goodwill impairment charges |  | (28,415) | (4,065) |
Foreign currency and other adjustments |  | (8,816) | (16,294) |
Ending balance | $ 267,032 | 323,788 | $ 267,032 | $ 242,118
Goodwill |  | 358,112 |  |
Accumulated impairment charges |  | $ (34,324) |  |

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