Subsequent Event - Additional Information (Detail) (Subsequent Event [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Nov. 05, 2012 Campus
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of domestic campuses to teach out upon subsequent event			23
Expected revenue from domestic campus to teach out		$ 124.3
Expected operating loss from domestic campus to teach out		62.0
Positions to eliminate across domestic campus			900
Amount in annual savings upon position elimination minimum		45.0
Amount in annual savings upon position elimination maximum		55.0
Pretax severance charge	$ 7.0