Restatement of Previously Issued Unaudited Financial Statements - Summary of Table Sets Forth the Effect of Consolidation and Correction of Errors and Reclassifications of 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
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenue	$ 285,062	$ 339,209
Costs and expenses:
Cost of educational services	124,176	134,941
Student services and administrative expenses	101,721	101,319
Legal and other investigation costs	1,500	0
Loss related to loan program guarantees	3,803	3,054
Total costs and expenses	231,200	239,314
Operating income	53,862	99,895
(Loss) on consolidation of PEAKS Trust	(73,248)	0
Interest income	34	681
Interest (expense)	(3,574)	(547)
Income (loss) before provision for income taxes	(22,926)	100,029
Provision (benefit) for income taxes	(5,655)	39,384
Net income (loss)	(17,271)	60,645	78,325
Earnings (loss) per share:
Basic	$ (0.74)	$ 2.39
Diluted	$ (0.74)	$ 2.37
Weighted average shares outstanding:
Basic	23,397	25,420
Diluted	23,397	25,636
As Previously Reported [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenue	287,711	341,794
Costs and expenses:
Cost of educational services	125,221
Student services and administrative expenses	106,282	106,266
Legal and other investigation costs	0
Loss related to loan program guarantees	3,464	0
Total costs and expenses	234,967	241,207
Operating income	52,744
(Loss) on consolidation of PEAKS Trust	0
Interest income	34
Interest (expense)	(1,152)
Income (loss) before provision for income taxes	51,626	100,721
Provision (benefit) for income taxes	20,496	39,650
Net income (loss)	31,130	61,071
Earnings (loss) per share:
Basic	$ 1.33	$ 2.40
Diluted	$ 1.33	$ 2.38
Weighted average shares outstanding:
Basic	23,397
Diluted	23,481
Consolidation of PEAKS Trust [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenue	1,360
Costs and expenses:
Cost of educational services	0
Student services and administrative expenses	519
Legal and other investigation costs	0
Loss related to loan program guarantees	0
Total costs and expenses	519
Operating income	841
(Loss) on consolidation of PEAKS Trust	(73,248)
Interest income	0
Interest (expense)	(2,422)
Income (loss) before provision for income taxes	(74,829)
Provision (benefit) for income taxes	(26,258)
Net income (loss)	(48,571)
Other Adjustments [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenue	(4,009)
Costs and expenses:
Cost of educational services	0
Student services and administrative expenses	(4,625)
Legal and other investigation costs	0
Loss related to loan program guarantees	339
Total costs and expenses	(4,286)
Operating income	277
(Loss) on consolidation of PEAKS Trust	0
Interest income	0
Interest (expense)	0
Income (loss) before provision for income taxes	277
Provision (benefit) for income taxes	107
Net income (loss)	170
Reclassifications [Member]
Schedule of Condensed Consolidating Statement of Operations [Line Items]
Revenue	0
Costs and expenses:
Cost of educational services	(1,045)
Student services and administrative expenses	(455)
Legal and other investigation costs	1,500
Loss related to loan program guarantees	0
Total costs and expenses	0
Operating income	0
(Loss) on consolidation of PEAKS Trust	0
Interest income	0
Interest (expense)	0
Income (loss) before provision for income taxes	0
Provision (benefit) for income taxes	0
Net income (loss)	$ 0