Supplemental Consolidating Financial Information (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 11,759	$ 15,410	$ 28,425	$ 10,177
Restricted cash	5,001
Accounts receivable, net	90,869	86,869
Prepaid expenses	7,383	6,043
Inventories	4,365	3,897
Deferred income taxes	810	540
Other	5,834	7,429
Total current assets	126,021	120,188
Equity investments in joint ventures	781	575
Property and equipment, net	224,714	221,050
Real estate subject to finance obligation	20,465	16,204
Goodwill	504,302	485,859
Intangible assets, net	33,797	35,044
Other assets	40,695	43,381
Total assets	950,775	922,301
Current liabilities:
Accounts payable	35,261	27,538
Accrued expenses	50,883	46,401
Income taxes payable	2,327	2,951
Current portion of long-term debt	12,907	11,065
Current portion of finance obligation	283	287
Other current liabilities	8,625	7,684
Total current liabilities	110,286	95,926
Long-term debt, less current portion	799,028	751,303
Finance obligation, less current portion	21,839	16,905
Other long-term liabilities	23,950	22,130
Deferred income taxes	5,593	6,202
Total liabilities	960,696	892,466
Noncontrolling interests-redeemable	16,350	11,368
Total Radiation Therapy Services Holdings, Inc. shareholder's (deficit) equity	(42,177)	2,420
Noncontrolling interests-nonredeemable	15,906	16,047
Total (deficit) equity	(26,271)	18,467
Total liabilities and equity	950,775	922,301
Parent
Current assets:
Cash and cash equivalents	151	168	45	184
Intercompany receivables	1,442	1,425
Deferred income taxes	(68)	(68)
Total current assets	1,525	1,525
Equity investments in joint ventures	(45,130)	(534)
Total assets	(43,605)	991
Current liabilities:
Income taxes payable	(1,272)	(1,273)
Total current liabilities	(1,272)	(1,273)
Deferred income taxes	(156)	(156)
Total liabilities	(1,428)	(1,429)
Total Radiation Therapy Services Holdings, Inc. shareholder's (deficit) equity	(42,177)	2,420
Total (deficit) equity	(42,177)	2,420
Total liabilities and equity	(43,605)	991
RTS
Supplemental Consolidating Financial Information
Ownership percentage held	100.00%
Current assets:
Cash and cash equivalents	291	124	10	39
Restricted cash	5,001
Prepaid expenses	167	90
Deferred income taxes	(2,699)	(2,697)
Other	247	319
Total current assets	3,007	(2,164)
Equity investments in joint ventures	797,725	802,705
Other assets	19,351	22,082
Intercompany note receivable	3,850	1,750
Total assets	823,933	824,373
Current liabilities:
Accounts payable	140	372
Intercompany payables	93,862	92,937
Accrued expenses	11,724	12,079
Income taxes payable	2,726	1,547
Total current liabilities	108,452	106,935
Long-term debt, less current portion	773,419	730,538
Deferred income taxes	(12,808)	(12,566)
Total liabilities	869,063	824,907
Total Radiation Therapy Services Holdings, Inc. shareholder's (deficit) equity	(45,130)	(534)
Total (deficit) equity	(45,130)	(534)
Total liabilities and equity	823,933	824,373
Subsidiary Guarantors
Supplemental Consolidating Financial Information
Ownership percentage held by subsidiary	100.00%
Current assets:
Cash and cash equivalents	139	6,545	17,652	733
Accounts receivable, net	48,548	47,231
Intercompany receivables	105,654	101,763
Prepaid expenses	6,628	5,320
Inventories	3,676	3,241
Deferred income taxes	3,020	3,017
Other	5,554	7,065
Total current assets	173,219	174,182
Equity investments in joint ventures	105,552	102,230
Property and equipment, net	188,063	186,084
Real estate subject to finance obligation	20,465	16,204
Goodwill	430,162	413,984
Intangible assets, net	13,892	15,555
Other assets	12,754	13,236
Intercompany note receivable	628	232
Total assets	944,735	921,707
Current liabilities:
Accounts payable	28,643	20,690
Accrued expenses	32,698	26,017
Income taxes payable	(305)	1,262
Current portion of long-term debt	8,819	6,424
Current portion of finance obligation	283	287
Other current liabilities	4,820	3,940
Total current liabilities	74,958	58,620
Long-term debt, less current portion	24,622	19,561
Finance obligation, less current portion	21,839	16,905
Other long-term liabilities	17,730	16,272
Deferred income taxes	15,958	15,726
Total liabilities	155,107	127,084
Total Radiation Therapy Services Holdings, Inc. shareholder's (deficit) equity	789,628	794,623
Total (deficit) equity	789,628	794,623
Total liabilities and equity	944,735	921,707
Subsidiary Non-Guarantors
Current assets:
Cash and cash equivalents	11,178	8,573	10,718	9,221
Accounts receivable, net	42,321	39,638
Prepaid expenses	588	633
Inventories	689	656
Deferred income taxes	557	288
Other	33	45
Total current assets	55,366	49,833
Equity investments in joint ventures	51	49
Property and equipment, net	36,651	34,966
Goodwill	74,140	71,875
Intangible assets, net	19,905	19,489
Other assets	8,590	8,063
Total assets	194,703	184,275
Current liabilities:
Accounts payable	6,478	6,476
Intercompany payables	13,234	10,251
Accrued expenses	6,461	8,305
Income taxes payable	1,178	1,415
Current portion of long-term debt	4,088	4,641
Other current liabilities	3,805	3,744
Total current liabilities	35,244	34,832
Long-term debt, less current portion	987	1,204
Other long-term liabilities	6,220	5,858
Deferred income taxes	2,599	3,198
Intercompany note payable	4,478	1,982
Total liabilities	49,528	47,074
Total Radiation Therapy Services Holdings, Inc. shareholder's (deficit) equity	145,175	137,201
Total (deficit) equity	145,175	137,201
Total liabilities and equity	194,703	184,275
Eliminations
Current assets:
Intercompany receivables	(107,096)	(103,188)
Total current assets	(107,096)	(103,188)
Equity investments in joint ventures	(857,417)	(903,875)
Intercompany note receivable	(4,478)	(1,982)
Total assets	(968,991)	(1,009,045)
Current liabilities:
Intercompany payables	(107,096)	(103,188)
Total current liabilities	(107,096)	(103,188)
Intercompany note payable	(4,478)	(1,982)
Total liabilities	(111,574)	(105,170)
Noncontrolling interests-redeemable	16,350	11,368
Total Radiation Therapy Services Holdings, Inc. shareholder's (deficit) equity	(889,673)	(931,290)
Noncontrolling interests-nonredeemable	15,906	16,047
Total (deficit) equity	(873,767)	(915,243)
Total liabilities and equity	$ (968,991)	$ (1,009,045)