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Discontinued Operations - Combined Summary Results of Operations for Discontinued Operations (Parenthetical) (Detail) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of business	$ 0	$ 27,085,000	$ 0
Income tax expense related to sale of schools		300,000
Goodwill allocated		$ 20,200,000

X

- Definition

Goodwill allocated to remainder of International reporting unit for book purposes upon sale of subsidiary.

+ References

No definition available.

+ Details

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X

- Definition

Income tax expense related to the sale of business.

+ References

No definition available.

+ Details

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X

- Definition

Gain (loss) from sale or disposal of an organization or integrated set of activities (for example, but not limited to, a partnership or corporation) engaged in providing a product or service in a commercial, industrial, or professional environment.

+ References

No definition available.

+ Details

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X

- Details

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