Comprehensive loss (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 item	Jun. 30, 2012
Comprehensive loss
Number of components of comprehensive loss			2
Components of accumulated other comprehensive loss
Balance, beginning of period			$ (11,464)
Other Comprehensive loss	(3,408)	(2,492)	(5,589)	(3,353)
Balance, end of period	(16,526)		(16,526)
Other
Components of accumulated other comprehensive loss
Other Comprehensive loss			(5,589)
Balance, end of period	(5,589)		(5,589)
Radiation Therapy Services Holdings, Inc. Shareholder
Components of accumulated other comprehensive loss
Balance, beginning of period			(11,464)
Other Comprehensive loss			(5,062)	(3,000)
Balance, end of period	(16,526)		(16,526)
Radiation Therapy Services Holdings, Inc. Shareholder | Foreign Currency Translation Adjustments
Components of accumulated other comprehensive loss
Balance, beginning of period			(11,464)
Other Comprehensive loss			(5,062)
Balance, end of period	(16,526)		(16,526)
Noncontrolling Interests | Foreign Currency Translation Adjustments
Components of accumulated other comprehensive loss
Balance, beginning of period			(1,327)
Other Comprehensive loss			(527)
Balance, end of period	$ (1,854)		$ (1,854)