Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended						6 Months Ended	9 Months Ended
	Sep. 30, 2014 segment		Sep. 30, 2014		Sep. 30, 2013		Jul. 15, 2014 segment	Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Segment Reporting [Abstract]
Number of reportable segments	2						1
Segment Reporting Information [Line Items]
Net revenue			$ 503,233		$ 263,035			$ 1,042,873		$ 780,714
Adjusted EBITDA			95,887		45,566			193,754		138,523
Earnings from continuing operations attributable to noncontrolling interests			47,570		44,869			139,318		135,247
Interest expense, net			(39,055)		(7,293)			(52,909)		(22,346)
Depreciation and amortization			(20,866)		(8,239)			(37,620)		(24,152)
Share-based compensation			(2,424)		(2,104)			(7,388)		(6,070)
Transaction costs			(25,102)		(110)			(28,681)		(285)
Debt extinguishment costs			(16,887)		0			(16,887)		0
Gain on deconsolidation			0		0			3,411		2,237
Earnings from continuing operations before income taxes			39,123		72,689			192,998		223,154
Acquisition and Capital Expenditures			8,098		49,348			47,546		80,166
Assets	5,421,357		5,421,357					5,421,357				2,177,944
Ambulatory Services [Member]
Segment Reporting Information [Line Items]
Net revenue			277,302		263,035			816,942		780,714
Adjusted EBITDA			47,871		45,566			145,738		138,523
Acquisition and Capital Expenditures			5,759	[1]	49,348	[1]		45,207	[1]	80,166	[1]
Assets	2,450,543		2,450,543					2,450,543				2,177,944
Physician Services [Member]
Segment Reporting Information [Line Items]
Net revenue	225,931	[2]	225,931		0			225,931		0
Adjusted EBITDA			48,016		0			48,016		0
Acquisition and Capital Expenditures			2,339		0			2,339		0
Assets	$ 2,970,814		$ 2,970,814					$ 2,970,814				$ 0

[1] Excludes the purchase price to acquire Sheridan.

[2] Net revenue by payor is from the period July 16, 2014, the date of the acquisition, through September 30, 2014. As such, historical amounts are not included.