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Financial Instruments - Additional Information (Detail) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2013 Y | Mar. 31, 2012 | Dec. 31, 2012
Investment Securities [Line Items] |  |  |
Cash and cash equivalents of not-for-profit schools with restrictions | $ 79,800,000 |  | $ 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 | (1,000) | 12,000 |
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 |  |
Number of days for termination notice | 5 days |  |
Loans disbursed under Credit Agreement secured by cash, percentage | 110.00% |  |
Repayment of amount borrowed | 80,000,000 |  |
Credit Agreement [Member] |  |  |
Investment Securities [Line Items] |  |  |
Minimum cash under covenant term | 75,000,000 |  |
Municipal bond [Member] |  |  |
Investment Securities [Line Items] |  |  |
Period debt obligations mature, years, maximum | 1 year |  |
Cumulative unrealized losses on municipal bonds | $ 500,000 |  |

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