Revenue Recognition (Details) - USD ($) $ in Thousands		3 Months Ended					9 Months Ended
		Sep. 30, 2015		Sep. 30, 2014	Sep. 30, 2014		Sep. 30, 2015		Sep. 30, 2014
Revenue, Major Customer [Line Items]
Provision for uncollectibles							$ (212,546)		$ (69,715)
Net revenue		$ 650,227		$ 502,350			$ 1,862,622		$ 1,040,138
Ambulatory Services [Member]
Revenue, Major Customer [Line Items]
Percentage of revenues from governmental healthcare programs							26.00%		25.00%
Net revenue		308,983		276,419			$ 903,884		$ 814,207
Physician Services [Member]
Revenue, Major Customer [Line Items]
Net fee for service revenue	[1]	370,674			$ 253,953		1,059,016
Contract and other revenue	[1]	33,062			25,171		95,749
Provision for uncollectibles		(62,492)		(53,193)	(53,193)		(196,027)		(53,193)
Net revenue		341,244	[1]	$ 225,931	225,931	[1]	958,738	[1]	$ 225,931
Medicare [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Net fee for service revenue	[1]	44,196			29,163		125,593
Medicaid [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Net fee for service revenue	[1]	18,456			13,217		48,318
Commercial and Managed Care [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Net fee for service revenue	[1]	254,171			166,340		716,361
Self-Pay [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Net fee for service revenue	[1]	$ 53,851			$ 45,233		$ 168,744
Sales Revenue, Net [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Percent of net revenue, over	[1]	100.00%			100.00%		100.00%
Health Care Organization, Patient Service Revenue [Member] | Sales Revenue, Net [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Percent of net revenue, over		108.60%			112.40%	[1]	110.40%	[1]
Health Care Organization, Patient Service Revenue [Member] | Sales Revenue, Net [Member] | Medicare [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Percent of net revenue, over	[1]	13.00%			12.90%		13.10%
Health Care Organization, Patient Service Revenue [Member] | Sales Revenue, Net [Member] | Medicaid [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Percent of net revenue, over	[1]	5.40%			5.90%		5.00%
Health Care Organization, Patient Service Revenue [Member] | Sales Revenue, Net [Member] | Commercial and Managed Care [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Percent of net revenue, over	[1]	74.50%			73.60%		74.70%
Health Care Organization, Patient Service Revenue [Member] | Sales Revenue, Net [Member] | Self-Pay [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Percent of net revenue, over	[1]	15.70%			20.00%		17.60%
Contract and Other Revenue [Member] | Sales Revenue, Net [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Percent of net revenue, over	[1]	9.70%			11.10%		10.00%
Provision for Uncollectibles [Member] | Sales Revenue, Net [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Percent of net revenue, over	[1]	(18.30%)			(23.50%)		(20.40%)

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