Revenue Recognition (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended			6 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2014
Revenue, Major Customer [Line Items]
Provision for uncollectibles									$ (139,274)	$ (21,947)	$ (20,005)
Net revenue	581,811	502,350	278,227	259,561	279,095	262,240	262,497	253,364	1,621,949	1,057,196	899,245
Physician Services [Member]
Revenue, Major Customer [Line Items]
Net fee for service revenue												574,672	[1]
Contract and other revenue												54,343	[1]
Provision for uncollectibles									(117,001)	0	0	(117,001)	[1]
Net revenue									512,014	0	0	512,014	[1]
Ambulatory Services [Member]
Revenue, Major Customer [Line Items]
Percentage of revenues from governmental healthcare programs									25.00%	25.00%	27.00%
Net revenue									1,109,935	1,057,196	899,245
Medicare [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Net fee for service revenue												61,378	[1]
Medicaid [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Net fee for service revenue												28,224	[1]
Commercial and Managed Care [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Net fee for service revenue												382,343	[1]
Self-Pay [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Net fee for service revenue												$ 102,727	[1]
Sales Revenue, Net [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Percent of net revenue, over												100.00%	[1]
Health Care Organization, Patient Service Revenue [Member] | Sales Revenue, Net [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Percent of net revenue, over												112.30%	[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												12.00%	[1]
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												5.50%	[1]
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												74.70%	[1]
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												20.10%	[1]
Contract and Other Revenue [Member] | Sales Revenue, Net [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Percent of net revenue, over												10.60%	[1]
Provision for Uncollectibles [Member] | Sales Revenue, Net [Member] | Physician Services [Member]
Revenue, Major Customer [Line Items]
Percent of net revenue, over												(22.90%)	[1]

[1] Net revenue by payor is for the period July 16, 2014, the date of the acquisition of Sheridan, through December 31, 2014. As such, historical amounts are not included.