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INVESTMENT IN UNCONSOLIDATED ENTITIES (Details) (USD $)	3 Months Ended												12 Months Ended
INVESTMENT IN UNCONSOLIDATED ENTITIES (Details) (USD $)	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
The Southern California Regional Gamma Knife Center [Abstract]
Renovation installation and operation agreement period													14 years
Ownership percentage (in hundredths)	20.00%	22.50%											20.00%
Neuro Partners LLC Condensed Income Statement Information [Abstract]
Patient revenue	$ 275	$ 617	$ 469	$ 595	$ 513	$ 503	$ 548	$ 496	$ 507	$ 548	$ 472	$ 389	$ 1,956,000	$ 2,060,000	$ 1,916,000
Net sales													3,341,000	2,117,000	0
USNC's equity in loss of investment in unconsolidated entitites													60,000	26,000	(40,000)
Florida Oncology Partners [Abstract]
Recorded investments	246,000				471,000								246,000	471,000
Ownership percentage (in hundredths)	20.00%	22.50%											20.00%
Boca Oncology Partners [Abstract]
Investment in unconsolidated entities	246,000				471,000								246,000	471,000
Ownership percentage (in hundredths)	20.00%	22.50%											20.00%
Additional investor purchased (in hundredths)													50.00%
CGK [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Ownership percentage (in hundredths)	39.00%				44.00%								39.00%	44.00%
Florida Oncology Partners [Abstract]
Ownership percentage (in hundredths)	39.00%				44.00%								39.00%	44.00%
Boca Oncology Partners [Abstract]
Ownership percentage (in hundredths)	39.00%				44.00%								39.00%	44.00%
CGK [Member] \| USNC [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Initial ownership percentage (in hundredths)													27.00%
Boca Oncology Partners, LLC [Member]
Florida Oncology Partners [Abstract]
Debt maturity period													5 years
Boca Oncology Partners [Abstract]
Area of real estate property (in square foot)	6,000												6,000
Amount loaned to related parties													56,250
Company loan interest rate (in hundredths)	7.00%												7.00%
Boca Oncology Partners, LLC [Member] \| USNC [Member]
Boca Oncology Partners [Abstract]
Amount loaned to related parties													28,000
Boca Oncology Partners RE, LLC [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Ownership percentage (in hundredths)	3.75%												3.75%
Florida Oncology Partners [Abstract]
Ownership percentage (in hundredths)	3.75%												3.75%
Ownership percentage by outside investors (in hundredths)													31.50%
Boca Oncology Partners [Abstract]
Percentage of interest in medical office building (in hundredths)													20.00%
Ownership percentage (in hundredths)	3.75%												3.75%
Ownership percentage by outside investors (in hundredths)													31.50%
Boca Oncology Partners RE, LLC [Member] \| USNC [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Ownership percentage (in hundredths)	15.40%												15.40%
Florida Oncology Partners [Abstract]
Ownership percentage (in hundredths)	15.40%												15.40%
Boca Oncology Partners [Abstract]
Ownership percentage (in hundredths)	15.40%												15.40%
BOP and BOPRE [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Ownership percentage (in hundredths)	11.25%				22.50%								11.25%	22.50%
Neuro Partners LLC Condensed Income Statement Information [Abstract]
Patient revenue													261,000	0
Net income (loss)													(578,000)	(106,000)
USNC's equity in loss of investment in unconsolidated entitites													(65,000)	(24,000)
Neuro Partners LLC Condensed Balance Sheet Information [Abstract]
Current assets	289,000				236,000								289,000	236,000
Noncurrent assets	2,897,000				439,000								2,897,000	439,000
Total assets	3,186,000				675,000								3,186,000	675,000
Current liabilities	308,000				0								308,000	0
Noncurrent liabilities	2,368,000				0								2,368,000	0
Equity	510,000				675,000								510,000	675,000
Total liabilities and equity	3,186,000				675,000								3,186,000	675,000
Florida Oncology Partners [Abstract]
Recorded investments	225,000												225,000
Ownership percentage (in hundredths)	11.25%				22.50%								11.25%	22.50%
Ownership percentage by outside investors (in hundredths)													88.75%
Boca Oncology Partners [Abstract]
Area of real estate property (in square foot)	32,000												32,000
Investment in unconsolidated entities	225,000												225,000
Ownership percentage (in hundredths)	11.25%				22.50%								11.25%	22.50%
Ownership percentage by outside investors (in hundredths)													88.75%
FOP and FOPRE [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Ownership percentage (in hundredths)	20.00%												20.00%
Neuro Partners LLC Condensed Income Statement Information [Abstract]
Patient revenue													3,251,000	2,117,000	0
Rental income													90,000	0
Net income (loss)													503,000	469,000	(118,000)
USNC's equity in loss of investment in unconsolidated entitites													106,000	94,000	(24,000)
Neuro Partners LLC Condensed Balance Sheet Information [Abstract]
Current assets	919,000				1,524,000								919,000	1,524,000
Noncurrent assets	6,374,000				5,717,000								6,374,000	5,717,000
Total assets	7,293,000				7,241,000								7,293,000	7,241,000
Current liabilities	965,000				1,001,000								965,000	1,001,000
Noncurrent liabilities	5,734,000				4,977,000								5,734,000	4,977,000
Equity	594,000				1,263,000								594,000	1,263,000
Total liabilities and equity	7,293,000				7,241,000								7,293,000	7,241,000
Florida Oncology Partners [Abstract]
Recorded investments	135,000				270,000					200,000			135,000	270,000
Ownership percentage (in hundredths)	20.00%												20.00%
Ownership percentage by outside investors (in hundredths)													80.00%
Notes receivable from related parties	200,000												200,000
Notes receivable interest rate (in hundredths)													10.00%
Notes receivable including accrued interest	208,000												208,000
Capital leases, amount	5,600,000												5,600,000
Percentage of guarantee obligations (in hundredths)													20.00%
Total amount of loan	1,354,275												1,354,275
Loan amount to be paid in monthly basis													8,500
Debt maturity period													120 months
Boca Oncology Partners [Abstract]
Investment in unconsolidated entities	135,000				270,000					200,000			135,000	270,000
Ownership percentage (in hundredths)	20.00%												20.00%
Ownership percentage by outside investors (in hundredths)													80.00%
Neuro Partners LLC and CGK [Member]
The Southern California Regional Gamma Knife Center [Abstract]
Ownership percentage (in hundredths)	20.00%												20.00%
Neuro Partners LLC Condensed Income Statement Information [Abstract]
Patient revenue													1,023,000	1,197,000	765,000
Rental income													888,000	888,000	828,000
Net sales													1,911,000	2,085,000	1,593,000
Net income (loss)													(108,000)	(95,000)	(467,000)
USNC's equity in loss of investment in unconsolidated entitites													(34,000)	(23,000)	(135,000)
Neuro Partners LLC Condensed Balance Sheet Information [Abstract]
Current assets	468,000				607,000								468,000	607,000
Noncurrent assets	2,261,000				2,603,000								2,261,000	2,603,000
Total assets	2,729,000				3,210,000								2,729,000	3,210,000
Current liabilities	442,000				440,000								442,000	440,000
Noncurrent liabilities	2,896,000				3,169,000								2,896,000	3,169,000
Equity	(609,000)				(399,000)								(609,000)	(399,000)
Total liabilities and equity	2,729,000				3,210,000								2,729,000	3,210,000
Florida Oncology Partners [Abstract]
Recorded investments	0												0
Ownership percentage (in hundredths)	20.00%												20.00%
Boca Oncology Partners [Abstract]
Investment in unconsolidated entities	$ 0												$ 0
Ownership percentage (in hundredths)	20.00%												20.00%