Segment Reporting (Details) $ in Thousands	3 Months Ended					6 Months Ended	9 Months Ended
	Sep. 30, 2015 USD ($)		Sep. 30, 2014 USD ($)	[1]	Sep. 30, 2014 USD ($)	Jul. 15, 2014 segment	Sep. 30, 2015 USD ($) segment		Sep. 30, 2014 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment						1	2
Segment Reporting Information [Line Items]
Net revenue	$ 650,227				$ 502,350		$ 1,862,622		$ 1,040,138
Adjusted EBITDA	133,177				95,869		354,904		193,491
Earnings from continuing operations attributable to noncontrolling interests	55,618				47,578		160,407		139,150
Interest expense, net	(30,242)				(39,054)		(90,671)		(52,906)
Depreciation and amortization	(24,106)				(20,838)		(70,536)		(37,533)
Share-based compensation	(3,727)				(2,424)		(11,319)		(7,388)
Net change in fair value of contingent consideration	(1,928)				0		(8,338)		0
Transaction costs	(2,107)				(25,102)		(5,560)		(28,681)
Debt extinguishment costs	0				(16,887)		0		(16,887)
Gain on deconsolidation	9,112				0		5,854		3,411
Earnings from continuing operations before income taxes	135,797				39,142		334,741		192,657
Acquisition and Capital Expenditures	51,799				8,098		280,496		47,546
Ambulatory Services [Member]
Segment Reporting Information [Line Items]
Net revenue	308,983				276,419		903,884		814,207
Adjusted EBITDA	55,353				47,853		162,965		145,475
Acquisition and Capital Expenditures	25,872				5,759		144,482		45,207
Physician Services [Member]
Segment Reporting Information [Line Items]
Net revenue	341,244	[1]	$ 225,931		225,931		958,738	[1]	225,931
Adjusted EBITDA	77,824				48,016		191,939		48,016
Net change in fair value of contingent consideration	(1,928)						(8,338)
Acquisition and Capital Expenditures	$ 25,927				$ 2,339		$ 136,014		$ 2,339

[1] On July 16, 2014, we completed the acquisition of Sheridan. As such, historical amounts for periods prior to that date are not included.