Restatement and Revision of Previously Issued Unaudited Financial Statements - Effect of Revisions on Affected Line Items on Condensed Consolidated Statement of Income (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Condensed Consolidated Statement of Income Data:
Revenue	$ 285,062	$ 339,209
Student services and administrative expenses	101,721	101,319
Loss related to loan program guarantees	3,803	3,054
Total costs and expenses	231,200	239,314
Income (loss) before provision for income taxes	(22,926)	100,029
Provision for income taxes	(5,655)	39,384
Net income (loss)	(17,271)	60,645	78,325
Earnings per share:
Basic	$ (0.74)	$ 2.39
Diluted	$ (0.74)	$ 2.37
As Previously Reported [Member]
Condensed Consolidated Statement of Income Data:
Revenue	287,711	341,794
Student services and administrative expenses	106,282	106,266
Loss related to loan program guarantees	3,464	0
Total costs and expenses	234,967	241,207
Income (loss) before provision for income taxes	51,626	100,721
Provision for income taxes	20,496	39,650
Net income (loss)	31,130	61,071
Earnings per share:
Basic	$ 1.33	$ 2.40
Diluted	$ 1.33	$ 2.38
Revisions [Member]
Condensed Consolidated Statement of Income Data:
Revenue		(2,585)
Student services and administrative expenses		(4,947)
Loss related to loan program guarantees		3,054
Total costs and expenses		(1,893)
Income (loss) before provision for income taxes		(692)
Provision for income taxes		(266)
Net income (loss)		(426)
As Revised [Member]
Condensed Consolidated Statement of Income Data:
Revenue		339,209
Student services and administrative expenses		101,319
Loss related to loan program guarantees		3,054
Total costs and expenses		239,314
Income (loss) before provision for income taxes		100,029
Provision for income taxes		39,384
Net income (loss)		$ 60,645
Earnings per share:
Basic		$ 2.39
Diluted		$ 2.37