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Summary of Significant Accounting Policies (Details Textual) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Apr. 30, 2009 | Apr. 30, 2008 | Dec. 31, 2011 acre | Sep. 30, 2011 | Dec. 31, 2011 Y acre | Dec. 31, 2010 | Dec. 31, 2009 | Jun. 30, 2011 | Jan. 29, 2004
Derivative Contract Details (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Deferred gain | $ 1,429 |  |  |  |  |  |  |  |
Due to related parties |  |  | 227 |  | 227 | 9,471 |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Land improvements and buildings, Useful Life, Minimum |  |  |  |  | 15 |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Goodwill |  |  | 2,941 |  | 2,941 | 2,941 |  |  | 2,941
Common stock acquired | 909 |  |  |  |  |  |  |  |
Aggregate Purchase Price | 50,000 |  |  |  |  |  |  |  |
Borrow to Finance Purchases | 25,675 |  |  |  |  |  |  |  |
Paid for repurchase common stock | 14,495 |  |  |  |  |  | 14,495 |  |
Paid for land and building | 35,505 |  |  |  |  |  |  |  |
Capital lease obligation | 30,020 |  |  |  |  |  | 30,020 |  |
Deferred gain | 1,429 |  |  |  |  |  |  |  |
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 |
Pledged collateral as noncurrent restricted cash |  |  |  |  |  | 760 |  |  |
Reduced pledge collateral |  |  | 555 |  | 555 |  |  |  |
Capitalized interest rate on borrowing to finance improvement |  |  |  |  | 2.30% | 3.10% | 5.40% |  |
Lease termination fee payable to old landlord |  |  | 1,093 |  |  |  |  |  |
Lease termination costs |  |  | (140) | 922 | 782 |  |  |  |
Leasehold improvement expense |  |  | 0 |  |  |  |  |  |
Capital Expenditure Paid Related to Deferred Loan Cost |  |  | 408 |  | 408 |  |  |  |
Accumulated amortization |  |  | 180 |  | 180 | 105 |  |  |
Interest expense on derivatives related to credit risk |  |  |  |  | 1 |  |  |  |
Area of the Company's campus in Phoenix, Arizona |  |  | 115 |  | 115 |  |  |  |
Percent of financial aid earn by student |  |  |  |  | 100.00% |  |  |  |
Period for write off inactive student accounts |  |  |  | 150 days |  |  |  |  |
Reduction in revenue due to scholarships offered to students |  |  |  |  | 73,612 | 55,833 | 34,155 |  |
Collaboration agreement cost |  |  |  |  |  | 8,500 |  |  |
Arrangement expense |  |  |  |  | 877 | 7,694 | 6,736 |  |
Prepaid maintenance and service fees for an aggregate amount |  |  | 4,900 |  | 4,900 |  |  |  |
Prepaid maintenance and service fees |  |  | 4,900 |  | 4,900 |  |  |  |
Agreement to pay former owner royalty amount |  | 22,500 |  |  |  |  |  |  |
Settlement of future royalty payment obligation |  | 5,920 |  |  |  |  |  |  |
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 |  |  |  |
Royalty Amortization period |  | 20 years |  |  |  |  |  |  |
Reclassification of net loss on interest rate corridor |  |  | 92 |  | 92 |  |  |  |
Fair value of the shares issued of the license agreement |  |  |  |  | 3,394 |  |  |  |
Accrued liability related to royalty arrangement |  |  | 231 |  | 231 | 875 |  |  |
Reserve for uncertain tax positions including interest and penalties |  |  | 543 |  | 543 | 388 |  |  |
Costs incurred due to unanticipated delays in information processing |  |  |  |  |  | 4,013 |  |  |
Advertising costs |  |  |  |  | 45,587 | 35,550 | 24,820 |  |
Expenses relating to this agreement |  |  |  |  |  | 9,233 |  |  |
Furniture, fixtures and equipment [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property and Equipment, Useful Life |  |  |  |  | 10 |  |  |  |
Computer equipment [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property and Equipment, Useful Life |  |  |  |  | 4 |  |  |  |
Vehicle estimated useful life [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Property and Equipment, Useful Life |  |  |  |  | 5 |  |  |  |
Land improvements and buildings [Member] |  |  |  |  |  |  |  |  |
Property, Plant and Equipment [Line Items] |  |  |  |  |  |  |  |  |
Land improvements and buildings, Useful Life, Minimum |  |  |  |  | 10 |  |  |  |
Land improvements and buildings, Useful Life, Maximum |  |  |  |  | 40 |  |  |  |
Summary of Significant Accounting Policies (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Land improvements and buildings, Useful Life, Maximum |  |  |  |  | 40 |  |  |  |
Mind Streams [Member] |  |  |  |  |  |  |  |  |
Derivative Contract Details (Textual) [Abstract] |  |  |  |  |  |  |  |  |
Due to related parties |  |  | $ 212 |  | $ 212 | $ 9,367 |  |  |

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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3213-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 17 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
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