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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 | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 Property | Dec. 31, 2011 | Dec. 31, 2010
Derivative [Line Items] |  |  |  |  |  |  |  |
Average days from the date of receipt in which funds remain as restricted cash and cash equivalents |  |  |  |  |  | 60 to 90 days |  |
Amount agreed to pay to settle the qui tam matter as restricted cash |  |  |  | $ 5,200 |  |  |  |
Reduced pledge collateral |  | 555 |  |  |  | 225 | 555 |
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% |  |
Property leased |  |  |  |  |  | 1 |  |
Collateralized properties |  |  |  |  |  | 4 |  |
Capitalized interest rate on borrowings to finance improvements |  |  |  |  |  | 2.20% | 2.30% | 3.10%
Property and Equipment, Useful Life |  |  |  |  |  | 15 years |  |
Lease termination fee payable to old landlord |  | 1,093 |  |  |  |  |  |
Lease termination costs |  | (140) | 922 |  |  |  | 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 |  |
Accrued liability related to royalty arrangement |  | 231 |  |  |  | 246 | 231 |
Discount net cash flows |  |  |  |  |  | 35.00% |  |
Reserve for uncertain tax positions including interest and penalties |  | 543 |  |  |  | 0 | 543 |
Reduction in revenue due to scholarships offered to students |  |  |  |  |  | 94,283 | 73,612 | 55,833
Percent of financial aid earn by student |  |  |  |  |  | 100.00% |  |
Period for write off inactive student accounts |  |  | 150 days |  |  |  |  |
Costs incurred due to unanticipated delays in information processing |  |  |  |  |  |  |  | 4,013
Advertising costs |  |  |  |  |  | 51,023 | 45,587 | 35,550
Payment made under the agreement |  |  |  |  |  |  | 8,500 |
Expenses relating to this agreement |  |  |  |  |  |  |  | 9,233
Arrangement expense |  |  |  |  |  | 2,328 | 877 | 7,694
Due to related parties |  | 227 |  |  |  | 523 | 227 |
Mind Streams [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Due to related parties |  | $ 212 |  |  |  | $ 523 | $ 212 |
Furniture, fixtures and equipment [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Property and Equipment, Useful Life |  |  |  |  |  |  | 10 years |
Computer equipment [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Property and Equipment, Useful Life |  |  |  |  |  |  | 4 years |
Vehicles [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Property and Equipment, Useful Life |  |  |  |  |  |  | 5 years |
Land improvements and buildings [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Property and Equipment, Useful Life |  |  |  |  |  |  | 40 years |
Land improvements and buildings [Member] | Minimum [Member] |  |  |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |  |  |
Property and Equipment, Useful Life |  |  |  |  |  |  | 10 years |

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