Subsequent Events (Details) $ in Millions	1 Months Ended	6 Months Ended
	Aug. 07, 2015 USD ($) physician_practice entity center	Jun. 30, 2015 entity center	Jun. 30, 2014 entity center
Subsequent Event [Member]
Subsequent Event [Line Items]
Consideration transferred | $	$ 31.1
Physician Practices [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of centers acquired | physician_practice	2
Ambulatory Services [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of centers acquired	1
Ambulatory Services [Member] | Noncontrolling Interest In Centers [Member] | Joint Venture [Member]
Subsequent Event [Line Items]
Number of joint venture entities acquired | entity		1	3
Ambulatory Services [Member] | Noncontrolling Interest In Centers [Member] | Joint Venture [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number of joint venture entities acquired | entity	1
Ambulatory Services [Member] | Controlling Interest [Member]
Subsequent Event [Line Items]
Number of centers acquired		4	2
Ambulatory Services [Member] | Controlling Interest [Member] | Joint Venture [Member]
Subsequent Event [Line Items]
Number consolidated entities contributed to joint venture		1	4
Ambulatory Services [Member] | Controlling Interest [Member] | Joint Venture [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Number consolidated entities contributed to joint venture	2