Summary of Significant Accounting Policies - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended		12 Months Ended
	Apr. 30, 2008	Mar. 31, 2013	Dec. 31, 2011	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary Of Significant Accounting Policies [Line Items]
Average days from the date of receipt in which funds remain as restricted cash and cash equivalents				60 to 90 days
Reduced pledge collateral				$ 0	$ 225
Note receivable from a financial institution at fair market value					27,000
Interest rate on notes					11.00%
Interest rate on loan					6.00%
Default rate					5.00%
Interest income and other income on the loan		2,187		1,459
Default interest amount				432
Late payment penalty amount				1,392
Statutory trustee's fee amount				139
Default interest and statutory trustee's fee				11.00%
Capitalized interest rate on borrowings to finance improvements				1.90%	2.20%	2.30%
Property and equipment, useful life				15 years
Lease termination fee payable to old landlord			1,093
Lease termination costs						782
Prepaid maintenance and service fees			4,900			4,900
Agreement period of acquired source code rights for the software developed, prepaid maintenance and service fee						7 years
Amortization of other current assets				Next twelve month cycle
Agreement to pay former owner royalty amount	22,500
Settlement of future royalty payment obligation	5,920
Royalty amortization period	20 years
Fair value of the shares issued of the license agreement				3,394
Discount net cash flows				35.00%
Reserve for uncertain tax positions including interest and penalties				0	0
Reduction in revenue due to scholarships offered to students				$ 111,789	$ 94,283	$ 73,612
Percent of financial aid earn by student				100.00%
Period for write off of inactive student accounts				150 days
Furniture, Fixtures and Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life				10 years
Computer Equipment [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life				4 years
Vehicles [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life				5 years
Minimum [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of days from the date of receipt in which funds remain as restricted cash and cash equivalents				60 days
Minimum [Member] | Land Improvements and Buildings [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life				10 years
Maximum [Member]
Summary Of Significant Accounting Policies [Line Items]
Number of days from the date of receipt in which funds remain as restricted cash and cash equivalents				90 days
Maximum [Member] | Land Improvements and Buildings [Member]
Summary Of Significant Accounting Policies [Line Items]
Property and equipment, useful life				40 years