Basis of Presentation (Details Textual) (USD $) In Millions, unless otherwise specified		3 Months Ended
	Apr. 01, 2012 state person agency facility bed	Apr. 03, 2011 B.I. Incorporated [Member]
Basis Of Presentation (Additional Textual) [Abstract]
Percentage of interest in acquired entity		100.00%
Revenue		$ 405.4
Net income		$ 20.1
Basis of Presentation (Textual) [Abstract]
Number of beds	79,000
Correctional, detention and residential treatment facilities including projects under development	113
Provision of monitoring services tracking offenders	70,000
Number of federal, state and local correctional agencies to which company provides monitoring services	900
Number of states in which the company operates	50