Acquired Intangible Assets Subject to Amortization and Values and Estimated Useful Lives (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended
	Aug. 03, 2011 American University Of Caribbean Student Relationships	Feb. 29, 2012 Faculdade Boa Viagem Student Relationships	Feb. 29, 2012 Faculdade Boa Viagem Curriculum	Apr. 02, 2012 Falcon Physician Reviews	Apr. 02, 2012 Falcon Physician Reviews Customer Relationships	Apr. 02, 2012 Falcon Physician Reviews Curriculum	Apr. 02, 2012 Falcon Physician Reviews Trade Names	Apr. 02, 2012 Falcon Physician Reviews Noncompete Agreements	Sep. 03, 2012 Faculdade Do Vale DoI pojuca	Sep. 03, 2012 Faculdade Do Vale DoI pojuca Student Relationships	Sep. 03, 2012 Faculdade Do Vale DoI pojuca Curriculum
Business Acquisition [Line Items]
Amortizable intangible assets	$ 14,300	$ 3,174	$ 133		$ 400	$ 870	$ 50	$ 940		$ 2,257	$ 79
Amortizable intangible assets, estimated useful lives	4 years	6 years	2 years	5 years 9 months 18 days	10 years	5 years	1 year 6 months	5 years	4 years 10 months 24 days	5 years	2 years