Investments in Unconsolidated Affiliates (Details) $ in Thousands	3 Months Ended								6 Months Ended	12 Months Ended
	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) entity equity_method_investment center	Dec. 31, 2014 USD ($) equity_method_investment center	Dec. 31, 2013 USD ($) equity_method_investment center
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 169,170				$ 75,475				$ 75,475	$ 169,170	$ 75,475
Equity in earnings of unconsolidated affiliates										16,152	7,038	$ 3,151
Net gain on deconsolidations										36,694	3,411	2,237
Management and billing fees included in net revenue	704,262	$ 650,227	$ 641,950	$ 570,445	581,811	$ 502,350	$ 278,227	$ 259,561		2,566,884	1,621,949	1,057,196
Receivables from VIEs included in other current assets	75,771				92,900				92,900	75,771	92,900
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	89,600				53,200				53,200	89,600	53,200
Equity in earnings of unconsolidated affiliates										$ 11,000	3,400
Ownership percentage										50.00%
Management and billing fees included in net revenue										$ 14,300	4,700
Receivables from VIEs included in other current assets	2,300				3,500				3,500	$ 2,300	3,500
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member] | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage										49.00%
Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member] | Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Ownership percentage										51.00%
Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Increase in equity method investments										$ 83,100	56,400
Joint Venture [Member] | Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 27,100									$ 27,100
Number consolidated centers contributed to joint venture | center										4
Sheridan Healthcare [Member] | Variable Interest Entity, Not Primary Beneficiary, Aggregated Disclosure [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates					$ 49,400				49,400		49,400
Ambulatory Services [Member]
Schedule of Equity Method Investments [Line Items]
Management and billing fees included in net revenue										$ 1,230,050	$ 1,109,935	$ 1,057,196
Ambulatory Services [Member] | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Estimated probability of fair value variables range										10.00%
Ambulatory Services [Member] | Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Estimated probability of fair value variables range										50.00%
Ambulatory Services [Member] | Controlling Interest [Member] | Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Number consolidated centers contributed to joint venture | center										9	4	1
Ambulatory Services [Member] | Noncontrolling Interest In Centers [Member] | Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Number of equity investments acquired in the period | equity_method_investment										5	4	1
Number of joint venture entities acquired | center										3	1	1
Ambulatory Services [Member] | Noncontrolling Interest In Surgical Hospital [Member] | Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Number of joint venture entities acquired | entity										1
Physician Services [Member]
Schedule of Equity Method Investments [Line Items]
Management and billing fees included in net revenue									$ 512,014	$ 1,336,834	$ 512,014	$ 0
Physician Services [Member] | Controlling Interest [Member] | Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Number consolidated centers contributed to joint venture | center										3
Deconsolidation [Member] | Ambulatory Services [Member]
Schedule of Equity Method Investments [Line Items]
Net cash received in exchange for noncontrolling interests in new investments										$ 8,500	$ 1,200
Cash contributed from divestiture of interest in consolidated subsidiaries												$ 300