Accounts Receivable (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Mar. 31, 2014	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Bad debt expense	$ 73,999		$ 5,216
Allowances for accounts receivable	124,606			113,357
Product Concentration Risk [Member] | Allowance for Doubtful Accounts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for doubtful accounts related to fee for service patient visits	72.00%
Ambulatory Services [Member] | Other Operating Expenses [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Bad debt expense	6,200		5,200
Physician Services [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Bad debt expense	$ 67,752	[1]	$ 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.