Limited Liability Companies (Details) (Limited Liability Companies, Surgical Services, USD $) In Millions, unless otherwise specified	Sep. 30, 2012 item	Dec. 31, 2011 item
Limited Liability Companies \| Surgical Services
Limited Liability Companies
Total assets of LLCs	$ 0.8	$ 0.9
Number of active LLCs in which the entity holds an interest	6	6

The carrying amount of the consolidated Variable Interest Entity's assets included in the reporting entity's statement of financial position.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (bb)

-URI http://asc.fasb.org/extlink&oid=7880789&loc=d3e5710-111685

Name:	us-gaap_VariableInterestEntityConsolidatedCarryingAmountAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant