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Supplemental Data - Condensed Consolidating Balance Sheets (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | ---
Condensed Balance Sheet Statements Captions [Line Items] |  |  |
Cash and cash equivalents | $ 448,215 | $ 508,234 |
Restricted cash and equivalents | 91,940 | 10,686 |
Accounts receivable, net | 1,847,086 | 1,714,750 |
Other current assets | 594,474 | 749,046 |
Current assets held for sale | 5,947,786 | 5,761,642 |
Total current assets | 8,929,501 | 8,744,358 |
Property and equipment, net | 3,275,636 | 3,149,213 |
Intangible assets, net | 97,609 | 113,827 |
Other long-term assets | 352,384 | 330,516 |
Goodwill | 6,702,659 | 6,610,279 | $ 6,015,375
Total assets | 19,357,789 | 18,948,193 |
Current liabilities | 3,435,483 | 1,856,107 |
Current liabilities held for sale | 1,419,621 | 1,185,070 |
Payables to parent | 0 |  |
Long-term debt and other long-term liabilities | 9,409,011 | 10,009,590 |
Noncontrolling interests subject to put provisions | 1,064,412 | 1,011,360 |
Total DaVita Inc. shareholders’ equity | 3,824,649 | 4,690,029 |
Noncontrolling interests not subject to put provisions | 204,613 | 196,037 |
Total equity | 4,029,262 | 4,886,066 |
Total liabilities and equity | 19,357,789 | $ 18,948,193 |
Physician Groups |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |
Cash and cash equivalents | 0 |  |
Restricted cash and equivalents | 0 |  |
Accounts receivable, net | 0 |  |
Other current assets | 0 |  |
Current assets held for sale | 567,216 |  |
Total current assets | 567,216 |  |
Property and equipment, net | 0 |  |
Intangible assets, net | 0 |  |
Other long-term assets | 0 |  |
Goodwill | 0 |  |
Total assets | 567,216 |  |
Current liabilities | 0 |  |
Current liabilities held for sale | 350,640 |  |
Payables to parent | 78,496 |  |
Long-term debt and other long-term liabilities | 0 |  |
Noncontrolling interests subject to put provisions | 0 |  |
Total DaVita Inc. shareholders’ equity | 138,080 |  |
Noncontrolling interests not subject to put provisions | 0 |  |
Total equity | 138,080 |  |
Total liabilities and equity | 567,216 |  |
Unrestricted Subsidiaries |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |
Cash and cash equivalents | 0 |  |
Restricted cash and equivalents | 0 |  |
Accounts receivable, net | 0 |  |
Other current assets | 0 |  |
Current assets held for sale | 3,031 |  |
Total current assets | 3,031 |  |
Property and equipment, net | 0 |  |
Intangible assets, net | 0 |  |
Other long-term assets | 0 |  |
Goodwill | 0 |  |
Total assets | 3,031 |  |
Current liabilities | 0 |  |
Current liabilities held for sale | 0 |  |
Payables to parent | 3,031 |  |
Long-term debt and other long-term liabilities | 0 |  |
Noncontrolling interests subject to put provisions | 0 |  |
Total DaVita Inc. shareholders’ equity | 0 |  |
Noncontrolling interests not subject to put provisions | 0 |  |
Total equity | 0 |  |
Total liabilities and equity | 3,031 |  |
Parent Company And Restricted Subsidiaries |  |  |
Condensed Balance Sheet Statements Captions [Line Items] |  |  |
Cash and cash equivalents | 448,215 |  |
Restricted cash and equivalents | 91,940 |  |
Accounts receivable, net | 1,847,086 |  |
Other current assets | 594,474 |  |
Current assets held for sale | 5,377,539 |  |
Total current assets | 8,359,254 |  |
Property and equipment, net | 3,275,636 |  |
Intangible assets, net | 97,609 |  |
Other long-term assets | 352,384 |  |
Goodwill | 6,702,659 |  |
Total assets | 18,787,542 |  |
Current liabilities | 3,435,483 |  |
Current liabilities held for sale | 1,068,981 |  |
Payables to parent | (81,527) |  |
Long-term debt and other long-term liabilities | 9,409,011 |  |
Noncontrolling interests subject to put provisions | 1,064,412 |  |
Total DaVita Inc. shareholders’ equity | 3,686,569 |  |
Noncontrolling interests not subject to put provisions | 204,613 |  |
Total equity | 3,891,182 |  |
Total liabilities and equity | $ 18,787,542 |  |

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