Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended
	Mar. 31, 2015 segment		Mar. 31, 2014	Jul. 15, 2014 segment	Dec. 31, 2014
Segment Reporting [Abstract]
Number of reportable segments	2			1
Segment Reporting Information [Line Items]
Net revenue	$ 570,445		$ 259,561
Adjusted EBITDA	93,755		46,006
Earnings from continuing operations attributable to noncontrolling interests	47,717		42,654
Interest expense, net	(30,247)		(6,960)
Depreciation and amortization	(22,818)		(8,259)
Share-based compensation	(3,709)		(2,458)
Transaction costs	(1,471)		0
Gain (loss) on deconsolidation	(223)		2,045
Earnings from continuing operations before income taxes	83,004		73,028
Acquisition and Capital Expenditures	141,361		12,076
Assets	5,584,009				5,523,524
Ambulatory Services [Member]
Segment Reporting Information [Line Items]
Net revenue	283,910		259,561
Adjusted EBITDA	47,308		46,006
Acquisition and Capital Expenditures	54,096		12,076
Physician Services [Member]
Segment Reporting Information [Line Items]
Net revenue	286,535	[1]	0
Adjusted EBITDA	46,447		0
Acquisition and Capital Expenditures	$ 87,265		$ 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.