Goodwill And Intangible Assets (Narrative) (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Dec. 31, 2014 USD ($) physician_practice	Dec. 31, 2015 USD ($) physician_practice center	Dec. 31, 2014 USD ($) center	Dec. 31, 2013 USD ($) center
Segment Reporting Information [Line Items]
Goodwill	$ 3,381,149	$ 3,970,210	$ 3,381,149	$ 1,758,970
Increase in goodwill		674,476	1,636,521
Goodwill deductible for tax purposes	64,500	$ 295,700	64,500
Amortization period		17 years 292 days
Debt extinguishment costs		$ 0	4,536	0
Amortization of Intangible Assets		70,500	32,500	$ 2,200
Estimated amortization of intangible assets, 2016		90,300
Estimated amortization of intangible assets, 2017		89,100
Estimated amortization of intangible assets, 2018		87,800
Estimated amortization of intangible assets, 2019		84,800
Estimated amortization of intangible assets, 2020		81,600
Estimated amortization of intangible assets, 2021 and thereafter		971,200
Ambulatory Services [Member]
Segment Reporting Information [Line Items]
Goodwill	1,900,000	2,000,000	1,900,000
Increase in goodwill		123,400
Physician Services [Member]
Segment Reporting Information [Line Items]
Goodwill	1,500,000	2,000,000	1,500,000
Increase in goodwill		465,700
Sheridan Healthcare [Member]
Segment Reporting Information [Line Items]
Goodwill	1,534,656		1,534,656
Deferred financing costs	53,000		53,000
Intangible assets	1,200,028		1,200,028
Series of Individually Immaterial Business Acquisitions [Member]
Segment Reporting Information [Line Items]
Goodwill	101,865	682,458	101,865
Intangible assets	$ 14,207	$ 420,414	14,207
Series of Individually Immaterial Business Acquisitions [Member] | Physician Services [Member]
Segment Reporting Information [Line Items]
Number of business acquisitions | physician_practice	2	9
Interest Expense [Member] | Bridge Loan [Member] | Sheridan Healthcare [Member]
Segment Reporting Information [Line Items]
Fees paid to obtain a commitment for financing			$ 12,800
Customer Relationships [Member]
Segment Reporting Information [Line Items]
Amortization period		20 years
Deferred Financing Costs, Amortizable Non-Compete Agreements, and Customer Agreements [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Amortization period		5 years
Deferred Financing Costs, Amortizable Non-Compete Agreements, and Customer Agreements [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Amortization period		10 years
Capitalized software [Member] | Minimum [Member]
Segment Reporting Information [Line Items]
Amortization period		3 years
Capitalized software [Member] | Maximum [Member]
Segment Reporting Information [Line Items]
Amortization period		8 years
Controlling Interest [Member] | Ambulatory Services [Member]
Segment Reporting Information [Line Items]
Number of business acquisitions | center		7	8
Controlling Interest [Member] | Sheridan Healthcare [Member] | Ambulatory Services [Member]
Segment Reporting Information [Line Items]
Number of business acquisitions | center			3
Controlling Interest [Member] | Series of Individually Immaterial Business Acquisitions [Member] | Ambulatory Services [Member]
Segment Reporting Information [Line Items]
Number of business acquisitions | center			5
Joint Venture [Member] | Controlling Interest [Member] | Ambulatory Services [Member]
Segment Reporting Information [Line Items]
Number Of Consolidated Entities Contributed To Joint Venture | center		9	4	1
Joint Venture [Member] | Controlling Interest [Member] | Physician Services [Member]
Segment Reporting Information [Line Items]
Number Of Consolidated Entities Contributed To Joint Venture | center		3