Business Combinations - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended		0 Months Ended			6 Months Ended
	Sep. 03, 2012 Number	Dec. 31, 2013	Sep. 03, 2012 Faculdade Do Vale DoI Ipojuca	Sep. 03, 2012 Faculdade Do Vale DoI Ipojuca Title Four Eligibility And Accreditations	Sep. 03, 2012 Faculdade Do Vale DoI Ipojuca Trade Name	Dec. 31, 2013 Faculadadde Diferencial Integral [Member] Number	Dec. 31, 2013 Faculadadde Diferencial Integral [Member] Trade Name
Business Acquisition [Line Items]
Amortizable intangible assets, estimated useful lives	4 years 10 months 24 days					15 years
Number of students in Degree program	5,000					2,500
Intangible Assets			$ 13.6			$ 17.7
Intangible assets not subject to amortization				10.2	1.1	15.2	1.9
Expected additional installment payment for acquisition over the next four years		2.4	3.9			9.0
Payments to Acquire Businesses			$ 32.2			$ 16.1