NOTE 5 - GOODWILL AND OTHER INTANGIBLE ASSETS (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Business Acquisition, Purchase Price Allocation, Goodwill Amount	$ 193,871	$ 159,507	$ 143,353	$ 106,502
Union Imaging
Business Acquisition, Purchase Price Allocation, Goodwill Amount			3,748
Anaheim Open MRI
Business Acquisition, Purchase Price Allocation, Goodwill Amount			305
Truxtun Medical Group
Business Acquisition, Purchase Price Allocation, Goodwill Amount			10,652
Sonix Medical Resources
Business Acquisition, Purchase Price Allocation, Goodwill Amount			884
Health Diagnostics
Business Acquisition, Purchase Price Allocation, Goodwill Amount			977
Image Medical Corporation
Business Acquisition, Purchase Price Allocation, Goodwill Amount		2,443	7,327
Progressive Health
Business Acquisition, Purchase Price Allocation, Goodwill Amount		1,369	12,856
Presgar Imaging
Business Acquisition, Purchase Price Allocation, Goodwill Amount		155	102
Imaging On Call LLC
Business Acquisition, Purchase Price Allocation, Goodwill Amount		3,799
Stuart London MD
Business Acquisition, Purchase Price Allocation, Goodwill Amount		600
Diagnostic Health Corp
Business Acquisition, Purchase Price Allocation, Goodwill Amount		2,009
Hematology Oncology
Business Acquisition, Purchase Price Allocation, Goodwill Amount		1,016
Radar LLC
Business Acquisition, Purchase Price Allocation, Goodwill Amount		845
Raven Holdings US Inc
Business Acquisition, Purchase Price Allocation, Goodwill Amount	7,895	3,918
Camarillo Imaging
Business Acquisition, Purchase Price Allocation, Goodwill Amount	86
West Coast Radiology
Business Acquisition, Purchase Price Allocation, Goodwill Amount	5,395
Advanced Medical Imaging Of Stuart
Business Acquisition, Purchase Price Allocation, Goodwill Amount	923
OrthopedicImaging [Member]
Business Acquisition, Purchase Price Allocation, Goodwill Amount	302
Upper Chesapeake Imaging
Business Acquisition, Purchase Price Allocation, Goodwill Amount	1,849
Vanowen Radioloty
Business Acquisition, Purchase Price Allocation, Goodwill Amount	386
ClinicalRadiology [Member]
Business Acquisition, Purchase Price Allocation, Goodwill Amount	1,838
Lenox Hill Radiology
Business Acquisition, Purchase Price Allocation, Goodwill Amount	$ 15,690