Investments in Unconsolidated Affiliates (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Jul. 16, 2014
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	$ 75,475,000	$ 15,526,000
Equity in earnings of unconsolidated affiliates	7,038,000	3,151,000	1,564,000
Acquisitions and related expenses	(2,184,058,000)	(73,594,000)	(277,388,000)
Gain on deconsolidation	3,411,000	2,237,000	0
Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	75,500,000	15,500,000
Ambulatory Services [Member]
Schedule of Equity Method Investments [Line Items]
Acquisitions and related expenses	(50,900,000)	(73,600,000)
Ambulatory Services [Member] | Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated affiliates	7,000,000	5,200,000
Equity in earnings of unconsolidated affiliates	700,000	200,000
Proceeds from divestiture of interest in consolidated subsidiaries	1,700,000
Payments to acquire noncontrolling interest in jointly owned entity	(500,000)
Acquisitions and related expenses		(300,000)
Ambulatory Services [Member] | Controlling Interest [Member] | Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Number consolidated centers contributed to joint venture	4	1
Ambulatory Services [Member] | Noncontrolling Interest In Centers [Member] | Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Number of joint venture entities acquired	3
Ambulatory Services [Member] | Minimum [Member]
Schedule of Equity Method Investments [Line Items]
Estimated probability of fair value variables range	5.00%
Ambulatory Services [Member] | Maximum [Member]
Schedule of Equity Method Investments [Line Items]
Estimated probability of fair value variables range	35.00%
Arrangement with HCA Holdings, Inc. [Member] | Physician Services [Member] | Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Equity in earnings of unconsolidated affiliates	3,400,000
Fair value of investment				49,400,000
Ownership percentage				51.00%
Management and billing fees	4,700,000
Arrangement with HCA Holdings, Inc. [Member] | Physician Services [Member] | Other Current Assets [Member] | Joint Venture [Member]
Schedule of Equity Method Investments [Line Items]
Receivable from entity	$ 3,500,000