Consolidated Balance Sheets - USD ($) $ in Thousands		Dec. 31, 2014		Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Dec. 31, 2011
Current assets:
Cash and cash equivalents ($7,202 and $4,414 related to VIEs)		$ 99,082	[1]	$ 160,491	$ 25,450	$ 11,974	$ 17,128	[1]	$ 32,122	$ 11,333	$ 10,393	$ 15,076	[1]	$ 9,850	[1]
Restricted cash		7,283	[1]	7,469	14,992	14,392	4,102	[1]	5,349	5,427	334
Accounts receivable, net ($13,799 and $14,527 related to VIEs)		121,799	[1]	128,617	134,641	133,983	105,167	[1]	86,064	81,016	88,590
Prepaid expenses ($651 and $628 related to VIEs)		8,728	[1]	8,516	7,319	8,995	7,577	[1]	7,898	7,383	7,549
Inventories ($370 and $609 related to VIEs)		3,162	[1]	3,112	3,324	3,353	2,674	[1]	3,020	2,828	2,556
Income taxes receivable ($0 and $0 related to VIEs)		4,432	[1]	3,944	3,739	3,003	2,425	[1]	1,299	1,003	484
Deferred income taxes ($6 and $6 related to VIEs)		1,771	[1]	3,665	3,603	3,741	3,932	[1]	2,041	1,873	1,763
Other ($403 and $47 related to VIEs)		8,291	[1]	8,635	8,024	12,773	11,731	[1]	10,313	6,681	7,911
Total current assets		254,548	[1]	324,449	201,092	192,214	154,736	[1]	148,106	117,544	119,580
Equity investments in joint ventures		1,646	[1]	1,596	2,925	2,769	2,555	[1]	684	781	666	575		692
Property and equipment, net ($19,051 and $17,786 related to VIEs)		269,570	[1]	273,330	274,054	273,991	239,237	[1]	216,369	223,341	216,602
Real estate subject to finance obligation		22,552	[1]	17,743	16,476	15,175	19,239	[1]	20,704	20,465	19,350
Goodwill ($54,377 and $23,970 related to VIEs)		476,559	[1]	449,277	493,708	682,667	579,875	[1]	506,145	507,017	488,186
Intangible assets, net ($12,421 and $3,319 related to VIEs)		81,385	[1]	83,405	87,139	90,843	84,742	[1]	30,543	33,552	32,229
Other assets ($6,335 and $6,035 related to VIEs)		47,184	[1]	48,142	50,413	51,940	49,969	[1]	47,539	50,108	51,091
Total assets		1,153,444	[1]	1,197,942	1,125,807	1,309,599	1,130,353	[1]	970,090	952,808	927,704
Current liabilities:
Accounts payable ($1,270 and $1,469 related to VIEs)		62,507	[1]	91,333	88,895	75,883	61,213	[1]	40,630	36,761	34,764
Accrued expenses ($3,534 and $4,692 related to VIEs)		88,604	[1]	102,040	88,697	94,326	64,148	[1]	64,330	51,135	62,171
Income taxes payable ($0 and $90 related to VIEs)		1,326	[1]	489	265	2,029	1,721	[1]	1,185	1,181	1,615
Current portion of long-term debt ($14 and $13 related to VIEs)		26,350	[1]	25,950	38,180	31,172	17,536	[1]	12,333	12,907	10,502
Current portion of finance obligation		433	[1]	361	278	255	317	[1]	298	283	279
Other current liabilities		19,512	[1]	11,163	18,148	17,701	9,990	[1]	5,435	7,997	8,287
Total current liabilities		198,732	[1]	231,336	234,463	221,366	154,925	[1]	124,211	110,264	117,618
Long-term debt, less current portion ($11 and $25 related to VIEs)		940,771	[1]	942,963	1,097,473	1,087,479	974,130	[1]	837,810	799,028	749,792
Finance obligation, less current portion		23,610	[1]	18,468	17,246	15,915	20,333	[1]	22,089	21,839	20,429
Embedded derivative features of Series A convertible redeemable preferred stock		15,843	[1]	15,006
Other long-term liabilities ($2,474 and $1,918 related to VIEs)		71,985	[1]	67,192	66,603	65,315	53,348	[1]	39,148	37,734	36,322
Deferred income taxes		4,834	[1]	7,136	7,296	7,451	7,319	[1]	5,264	6,017	6,430
Total liabilities		1,255,775	[1]	1,282,101	1,423,081	1,397,526	1,210,055	[1]	1,028,522	974,882	930,591
Series A convertible redeemable preferred stock, $0.001 par value, $1,000 stated value, 3,500,000 and -0- authorized, 385,000 and -0- issued and outstanding at December 31, 2014 and 2013, respectively		319,997	[1]	304,271
Noncontrolling interests - redeemable		15,273	[1]	15,685	16,000	15,973	15,899	[1]	15,933	16,350	11,379
Commitments and contingencies			[1]					[1]
Equity:
Common stock, $0.01 par value, 1,000,000 and 1,028 shares authorized, 1,028 issued and outstanding at December 31, 2014 and 2013, respectively	[1]
Additional paid-in capital		634,930	[1]	649,993	651,034	650,999	650,879	[1]	650,680	652,252	652,098
Retained deficit		(1,091,449)	[1]	(1,063,107)	(975,224)	(764,987)	(734,158)	[1]	(716,383)	(688,544)	(667,710)			(487,656)
Accumulated other comprehensive loss, net of tax		(36,920)	[1]	(36,411)	(34,827)	(34,119)	(26,102)	[1]	(21,056)	(17,269)	(14,123)
Total 21st Century Oncology Holdings, Inc. shareholder's deficit		(493,439)	[1]	(449,525)	(359,017)	(148,107)	(109,381)	[1]	(86,759)	(53,561)	(29,735)
Noncontrolling interests - nonredeemable		55,838	[1]	45,410	45,743	44,207	13,780	[1]	12,394	15,137	15,469
Total deficit		(437,601)	[1]	(404,115)	(313,274)	(103,900)	(95,601)	[1]	(74,365)	(38,424)	(14,266)	9,364	[1]	172,844	[1]
Total liabilities and equity		1,153,444	[1]	$ 1,197,942	$ 1,125,807	$ 1,309,599	1,130,353	[1]	$ 970,090	$ 952,808	$ 927,704
Parent
Equity:
Accumulated other comprehensive loss, net of tax		$ (36,920)					$ (26,102)					$ (11,823)		$ (5,275)

[1] As Restated