The Company and Basis of Presentation - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2013 Location State Attendant
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of students in degree programs	61,000
Number of states where online programs are offered	48
Number of locations	149
Number of campuses	147
Number of learning sites	2
Number of states	39