Segment Reporting (Details) $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2015 USD ($)		Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) segment		Jul. 15, 2014 segment	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment				2		1
Segment Reporting Information [Line Items]
Net revenue	$ 641,950		$ 278,227	$ 1,212,395			$ 537,788
Adjusted EBITDA	127,972		51,616	221,727			97,622
Earnings from continuing operations attributable to noncontrolling interests	57,072		48,918	104,789			91,572
Interest expense, net	(30,182)		(6,892)	(60,429)			(13,852)
Depreciation and amortization	(23,612)		(8,436)	(46,430)			(16,695)
Share-based compensation	(3,883)		(2,506)	(7,592)			(4,964)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	(6,410)		0	(6,410)			0
Transaction costs	(1,982)		(3,579)	(3,453)			(3,579)
Gain (loss) on deconsolidation	(3,035)		1,366	(3,258)			3,411
Earnings from continuing operations before income taxes	115,940		80,487	198,944			153,515
Acquisition and Capital Expenditures	87,336		28,436	228,697			40,512
Assets	5,668,032			5,668,032				$ 5,523,524
Ambulatory Services [Member]
Segment Reporting Information [Line Items]
Net revenue	310,991		278,227	594,901			537,788
Adjusted EBITDA	60,304		51,616	107,612			97,622
Acquisition and Capital Expenditures	64,514		28,436	118,610			40,512
Physician Services [Member]
Segment Reporting Information [Line Items]
Net revenue	330,959	[1]	0	617,494	[1]		0
Adjusted EBITDA	67,668		0	114,115			0
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability				(6,410)
Acquisition and Capital Expenditures	$ 22,822		$ 0	$ 110,087			$ 0

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