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Financial Instruments (Narrative) (Detail) (USD $) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2012 Year | Jun. 30, 2011 | Jun. 30, 2012 Year | Jun. 30, 2011 | Dec. 31, 2011
Schedule of Investments [Line Items] |  |  |  |  |
Period cash equivalents and short-term investments have been in continuous unrealized loss position, years, maximum | 1 |  | 1 |  |
Cash and cash equivalents of not-for-profit schools with restrictions | $ 63,300,000 |  | $ 63,300,000 |  | $ 74,500,000
Cumulative unrealized losses on municipal bonds | (108,000) | (39,000) | (120,000) | 46,000 |
ARS auction events have been failing, years, minimum |  |  | 3 |  |
Letters of credit outstanding under U.S. Credit Agreement | 6,700,000 |  | 6,700,000 |  |
Letters of credit total credit availability under U.S. Credit Agreement | 185,000,000 |  | 185,000,000 |  |
Letters of credit remaining credit availability under U.S. Credit Agreement | 178,300,000 |  | 178,300,000 |  |
U.S. Government Agencies [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Period debt obligations mature, years, maximum |  |  | 1 |  |
Municipal Bonds [Member] |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
ARS stated terms to maturity, years, minimum |  |  | 1 |  |
Cumulative unrealized losses on municipal bonds |  |  | $ 735,000 |  |

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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 Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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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