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Summary of Segment Net Revenues, Segment Operating Income (Loss) and Reconciliation of Segment Income to Consolidated Income from Continuing Operations Before Income Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Patient service revenues |  | $ 3,533,589 | $ 3,525,665 | $ 3,434,618 | $ 3,287,965 | $ 3,328,017 | $ 3,251,824 | $ 3,172,489 | $ 3,042,776 | $ 9,480,279 | $ 8,868,338 | $ 8,307,195
Less: Provision for uncollectible accounts |  |  |  |  |  |  |  |  |  | (427,860) | (366,884) | (293,546)
Net patient service revenues |  |  |  |  |  |  |  |  |  | 9,052,419 | 8,501,454 | 8,013,649
Other revenues |  |  |  |  |  |  |  |  |  | 1,220,323 | 1,032,364 | 763,086
Total net operating revenues |  |  |  |  |  |  |  |  |  | 13,781,837 | 12,795,106 | 11,764,050
Capitated revenues |  |  |  |  |  |  |  |  |  | 3,509,095 | 3,261,288 | 2,987,315
Operating income (loss) |  | 244,935 | 509,368 | 480,548 | (64,156) | 452,085 | 437,536 | 484,295 | 441,225 | 1,170,695 | 1,815,141 | 1,550,134
Contingent earn-out obligation adjustment |  |  |  |  |  |  |  |  |  |  |  | 56,977
Corporate administrative support | [1] |  |  |  |  |  |  |  |  | (18,965) | (13,012) | (53,699)
Debt expense |  |  |  |  |  |  |  |  |  | (408,380) | (410,294) | (429,943)
Debt refinancing charges |  |  |  |  |  |  |  |  |  | (48,072) | (97,548) |
Other income |  |  |  |  |  |  |  |  |  | 8,893 | 2,374 | 4,787
Income from continuing operations before income taxes |  | $ 146,307 | $ 408,371 | $ 330,539 | $ (162,081) | $ 354,365 | $ 336,412 | $ 282,308 | $ 336,588 | 723,136 | 1,309,673 | 1,124,978
Operating Segments |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net operating revenues |  |  |  |  |  |  |  |  |  | 13,861,123 | 12,852,469 | 11,812,296
Operating income (loss) | [2] |  |  |  |  |  |  |  |  | 1,189,660 | 1,828,153 | 1,546,856
Operating Segments | U.S. dialysis and related lab services |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Patient service revenues |  |  |  |  |  |  |  |  |  | 9,033,991 | 8,550,201 | 8,032,772
Less: Provision for uncollectible accounts |  |  |  |  |  |  |  |  |  | (406,530) | (353,028) | (281,146)
Net patient service revenues |  |  |  |  |  |  |  |  |  | 8,627,461 | 8,197,173 | 7,751,626
Other revenues | [3] |  |  |  |  |  |  |  |  | 13,971 | 13,498 | 12,600
Total net operating revenues |  |  |  |  |  |  |  |  |  | 8,641,432 | 8,210,671 | 7,764,226
Operating income (loss) | [2] |  |  |  |  |  |  |  |  | 1,259,632 | 1,637,626 | 1,200,198
Operating Segments | U.S. dialysis and related lab services | External Sources |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Patient service revenues |  |  |  |  |  |  |  |  |  | 8,980,515 | 8,513,089 | 7,998,692
Operating Segments | U.S. dialysis and related lab services | Intersegment Revenue |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Patient service revenues |  |  |  |  |  |  |  |  |  | 53,476 | 37,112 | 34,080
Operating Segments | HealthCare Partners (HCP) |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net patient service revenues |  |  |  |  |  |  |  |  |  | 317,950 | 219,306 | 220,251
Other revenues | [4] |  |  |  |  |  |  |  |  | 82,470 | 91,374 | 55,723
Total net operating revenues |  |  |  |  |  |  |  |  |  | 3,837,261 | 3,502,299 | 3,196,188
Capitated revenues |  |  |  |  |  |  |  |  |  | 3,436,705 | 3,190,903 | 2,919,964
Operating income (loss) | [2] |  |  |  |  |  |  |  |  | 33,929 | 214,983 | 385,253
Operating Segments | HealthCare Partners (HCP) | Intersegment Revenue |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Other revenues |  |  |  |  |  |  |  |  |  | 136 | 716 | 250
Operating Segments | Other-Ancillary services and strategic initiatives |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net patient service revenues |  |  |  |  |  |  |  |  |  | 160,484 | 122,087 | 75,852
Other revenues |  |  |  |  |  |  |  |  |  | 1,123,882 | 927,492 | 694,763
Total net operating revenues |  |  |  |  |  |  |  |  |  | 1,382,430 | 1,139,499 | 851,882
Capitated revenues |  |  |  |  |  |  |  |  |  | 72,390 | 70,385 | 67,351
Operating income (loss) | [2] |  |  |  |  |  |  |  |  | (103,901) | (24,456) | (38,595)
Operating Segments | Other-Ancillary services and strategic initiatives | Intersegment Revenue |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net operating revenues |  |  |  |  |  |  |  |  |  | 25,674 | 19,535 | 13,916
Intersegment Elimination |  |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Total net operating revenues |  |  |  |  |  |  |  |  |  | $ (79,286) | $ (57,363) | $ (48,246)
[1] | Corporate administrative support costs in 2013 also include $7,721 of an adjustment to reduce a tax asset associated with the HCP acquisition escrow provisions.
[2] | Certain costs previously reported in the ancillary services and strategic initiatives have been reclassified to U.S. dialysis and related lab services to conform to the current year presentation.
[3] | Includes management fees for providing management and administrative services to dialysis centers in which the Company owns a minority equity investment or which are wholly-owned by third parties.
[4] | Other revenues primarily relate to providing medical consulting services.

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