ACQUISITIONS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 O & P companies entity clinics	Dec. 31, 2011 O & P companies entity clinics	Dec. 31, 2010 O & P companies clinics entity	Dec. 31, 2010 Accelerated Care Plus Corp. (ACP)	Dec. 02, 2010 Accelerated Care Plus Corp. (ACP)
Acquisitions
Number of O&P companies acquired (in entities)	18	8	5
Number of patient-care centers operated by acquiree	59	21	6
Aggregate purchase price of O&P businesses	$ 83.1	$ 24.9	$ 10.6
Promissory notes as a part of purchase price	21.4	6.7	3.0
Contingent consideration payable reported as other liabilities	1.6	4.1	2.2
Maximum term for payment of contingent consideration (in years)	5 years	4 years	3 years
Goodwill recorded, related to acquisitions	63.8	17.2	9.2		96.9
Customer lists recorded, related to acquisitions	12.1	2.4
Accounts receivable recorded, related to acquisitions	6.0	3.0
Other assets and liabilities recorded, related to acquisitions	1.2	2.3
Goodwill recorded, expected election to treat as asset acquisition	13.0	14.0
Acquisition purchase price paid in cash	60.1	14.1	5.4		157.8
Transaction costs incurred on acquisition	1.2	0.8			5.4
Legal and advisor fees, included in acquisition expenses					3.3
Stock-based compensation related to sale of stock to executives, included in acquisition expenses					2.1
Intangible assets				48.2
Fixed assets at fair value				32.5
Current assets				7.2
Current liabilities				6.4
Deferred tax liabilities				$ 20.4