ACQUISITIONS (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012 Y center entity	Sep. 30, 2011 Y entity center
O & P companies
Acquired intangible assets
Number of O&P companies acquired (in entities)	14	5
Number of patient-care centers operated by acquiree	21	10
Aggregate purchase price of O&P businesses	$ 21.8	$ 16.2
Promissory notes as a part of purchase price	7.6	3.9
Contingent consideration payable reported as other liabilities	1.6	2.3
Maximum term for payment of contingent consideration (in years)	5	2
Acquisition purchase price paid in cash	12.6	10.0
Goodwill recorded, related to acquisitions	13.6	10.0
Accelerated Care Plus Corp. (ACP)
Acquired intangible assets
Contingent consideration paid on acquisitions prior to adoption of new authoritative guidance	0.5	0.7
Contingent consideration paid after adoption of new authoritative guidance	1.3	0.7
Estimated payments related to contingent consideration provisions of acquisitions in future periods	$ 7.3