ACQUISITIONS (Details) $ in Thousands	3 Months Ended		6 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2014 USD ($)	Mar. 31, 2013 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2013 USD ($)	Sep. 30, 2014 USD ($)	Sep. 30, 2013 USD ($)	Dec. 31, 2014 USD ($) item clinic	Dec. 31, 2013 USD ($) item clinic	Dec. 31, 2012 USD ($) item clinic
Components of the aggregated purchase price the assets acquired and liabilities assumed
Net cash	$ 19,142	$ 65	$ 33,934	$ 5,776	$ 36,784	$ 6,621	$ 38,097	$ 10,295	$ 61,401
Issuance of seller notes	8,450		11,901	268	13,172	614	13,964	2,344	20,223
Goodwill	$ 702,769	$ 675,451	$ 715,010	$ 678,748	$ 716,571	$ 679,721	710,053	682,628	675,468
Adjustments to working capital, included in cash paid for Acquisition							0	300	500
O & P and Distribution companies
Acquisitions
Amount of goodwill deductible for tax purposes							34,300	5,000	15,300
Acquisition expenses							1,200	900	1,200
Components of the aggregated purchase price the assets acquired and liabilities assumed
Net cash							38,069	9,975	60,947
Issuance of seller notes							13,964	2,344	20,223
Contingent consideration							291	708	2,625
Other working capital adjustments							345	235
Aggregate purchase price of businesses							52,669	13,262	83,795
Accounts receivable							5,322	2,935	6,210
Inventories							3,183	931	2,163
Acquired customer intangibles and other intangible assets, net							12,136	1,507	10,317
Other assets							1,800	1,997	4,164
Accounts payable and other liabilities assumed							(5,504)	(882)	(4,517)
Net assets acquired							16,937	6,488	18,337
Goodwill							$ 35,732	$ 6,774	$ 65,458
Weighted-average estimated useful lives of acquired intangible assets							10 years	8 years	9 years
O & P company
Acquisitions
Number of businesses acquired | item							12	9	16
Number of patient care clinics operated by acquiree | clinic							37	22	59
Number of rehabilitation centers operated | item									1
Distribution company
Acquisitions
Number of businesses acquired | item							1