Revision of 2011 and 2012 Financial Statements - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	0 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011
Increase in retained earnings	$ 2,969	$ 5,366
Decrease in capital surplus	2,969	5,366
Increase in retained earnings related to recognition of revenue related to students withdrawal from program			306
Decrease in retained earnings related to recognition of revenue related to students withdrawal from program	1,028
Revisions [Member]
Increase in retained earnings	1,941		5,672
Decrease in capital surplus	2,969		5,366
Increase in retained earnings related to recognition of revenue related to students withdrawal from program			306
Decrease in retained earnings related to recognition of revenue related to students withdrawal from program	$ 1,028