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Financial Instruments - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 Y | Jun. 30, 2012 | Dec. 31, 2012
Financial Instruments [Line Items] |  |  |  |  |
Cash and cash equivalents of not-for-profit schools with restrictions | $ 72,500,000 |  | $ 72,500,000 |  | $ 87,200,000
Period cash equivalents and short-term investments have been in continuous unrealized loss position, years, maximum |  |  | 1 year |  |
Period cash equivalents and long-term investments have been in continuous unrealized loss position, years, minimum |  |  | 1 year |  |
Cumulative unrealized losses on municipal bonds | (4,000) | 108,000 | (5,000) | 120,000 |
Years ARS auction events have been failing |  |  | 3 |  |
Revolving credit facility maturity date |  |  | Jan. 31, 2014 |  |
Number of days for pre-payment notice | 3 days |  | 3 days |  |
Number of days for termination notice | 5 days |  | 5 days |  |
Loans disbursed under Credit Agreement secured by cash, percentage | 110.00% |  | 110.00% |  |
Repayment of amount borrowed |  |  | 0 |  |
Credit Agreement [Member] |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Minimum cash under covenant term | 75,000,000 |  | 75,000,000 |  |
Municipal bond [Member] |  |  |  |  |
Financial Instruments [Line Items] |  |  |  |  |
Period debt obligations mature, years, maximum |  |  | 1 year |  |
Cumulative unrealized losses on municipal bonds |  |  | $ 500,000 |  |

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- Definition Cash and cash equivalents related to not-for-profit schools which is required to be utilized for only the specific not-for-profit schools it is generated from. + References No definition available. + Details
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- Details
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- Definition Long Term Investment Continuous Unrealized Loss Position Period + References No definition available. + Details
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- Definition The minimum amount of years that an investment security as of the balance sheet date has failed at auction events. The investment security may include marketable securities, derivative financial instruments and investments accounted for under the equity method. + References No definition available. + Details
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- Definition Date the credit facility terminates, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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