Acquisitions (Fair Value Of Total Consideration Transferred And Major Class Of Consideration) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Goodwill	$ 3,970,210	$ 3,381,149	$ 1,758,970
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Accounts receivable	62,216	1,816
Other current assets	21,477	1,075
Property and equipment	15,484	3,294
Goodwill	682,458	101,865
Intangible assets	420,414	14,207
Other long-term assets	342	0
Accounts payable	(3,641)	(2,519)
Other accrued liabilities	(45,386)	(626)
Deferred income taxes	(88,728)	0
Other long-term liabilities	(4,958)	(8,588)
Long-term debt	(6,046)	(717)
Total fair value	1,053,632	109,807
Less: Fair value attributable to noncontrolling interests	85,443	39,371
Acquisition date fair value of total consideration transferred	968,189	70,436
Sheridan Healthcare [Member]
Business Acquisition [Line Items]
Accounts receivable		130,260
Other current assets		105,757
Property and equipment		20,185
Goodwill		1,534,656
Intangible assets		1,200,028
Other long-term assets		50,304
Accounts payable		(5,862)
Other accrued liabilities		(118,548)
Deferred income taxes		(432,792)
Other long-term liabilities		(69,456)
Long-term debt		(4,594)
Total fair value		2,409,938
Less: Fair value attributable to noncontrolling interests		24,365
Acquisition date fair value of total consideration transferred		2,385,573
Physician Services [Member]
Business Acquisition [Line Items]
Goodwill	$ 2,000,000	$ 1,500,000