Acquisitions (Fair Value Of Total Consideration Transferred And Major Class Of Consideration) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
Business Acquisition [Line Items]
Goodwill	$ 3,381,149		$ 1,758,970	$ 1,652,002
Series of Individually Immaterial Business Acquisitions [Member]
Business Acquisition [Line Items]
Accounts receivable	1,816		4,011
Other current assets	1,075		2,014
Property and equipment	3,294		6,894
Goodwill	101,865		116,243
Intangible assets	14,207		0
Other long-term assets	0		0
Accounts payable	(2,519)		(2,214)
Other accrued liabilities	(626)		(532)
Deferred income taxes	0		0
Other long-term liabilities	(8,588)		(254)
Long-term debt	(717)		(3,028)
Total fair value	109,807		123,134
Less: Fair value attributable to noncontrolling interests	39,371		49,792
Acquisition date fair value of total consideration transferred	70,436		73,342
Sheridan Healthcare [Member]
Business Acquisition [Line Items]
Accounts receivable	130,260	[1]
Other current assets	105,757	[1]
Property and equipment	20,185	[1]
Goodwill	1,534,656	[1]
Intangible assets	1,200,028	[1]
Other long-term assets	50,304	[1]
Accounts payable	(5,862)	[1]
Other accrued liabilities	(118,548)	[1]
Deferred income taxes	(432,792)	[1]
Other long-term liabilities	(69,456)	[1]
Long-term debt	(4,594)	[1]
Total fair value	2,409,938	[1]
Less: Fair value attributable to noncontrolling interests	24,365	[1]
Acquisition date fair value of total consideration transferred	$ 2,385,573	[1]

[1] allocation of fair value of acquired assets and liabilities associated with these acquisitions at December 31, 2014.