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Significant Accounting Policies (Details Textual) (USD $) In Thousands, except Share data, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Significant Accounting Policies (Textual) |  |  |
Percentage of tuition revenue in total revenue | 96.00% |  |
Depreciation and amortization on property and equipment | $ 23,973 | $ 21,525 | $ 17,309
Common stock, par value | $ 0.01 | $ 0.01 |
Common stock, shares authorized | 20,000,000 | 20,000,000 |
Common stock, shares issued | 11,387,299 | 11,792,456 |
Common stock, shares outstanding | 11,387,299 | 11,792,456 |
Preferred stock, shares authorized | 8,000,000 | 8,000,000 |
Preferred stock, shares issued |  |  |
Preferred stock, shares outstanding |  |  |
Minimum [Member] |  |  |
Significant Accounting Policies (Textual) |  |  |
Estimated useful life of property and equipment | 3 years |  |
Leasehold improvements and long-term liability amortization period | 5 years |  |
Maximum [Member] |  |  |
Significant Accounting Policies (Textual) |  |  |
Estimated useful life of property and equipment | 40 years |  |
Leasehold improvements and long-term liability amortization period | 10 years |  |

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- Definition Face amount or stated value of common stock per share; generally not indicative of the fair market value per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 30 -Article 5 + Details
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