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Assets Acquired and Liabilities Assumed and Recognized at Acquisition Dates at Estimated Fair Values (Detail) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 9,382,996 | $ 9,294,479 | $ 9,415,295
The Everett Clinic Medical Group (TEC) |  |  |
Business Acquisition [Line Items] |  |  |
Current assets, net of cash acquired | 91,591 |  |
Property and equipment | 108,533 |  |
Amortizable intangible and other long-term assets | 34,050 |  |
Goodwill | 244,502 |  |
Current liabilities assumed | (50,940) |  |
Deferred income taxes | (16,880) |  |
Noncontrolling interests assumed | (9,885) |  |
Aggregate purchase price | $ 400,971 |  |

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- Definition Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73530397&loc=d3e4845-128472 + Details
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