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Regulatory - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Loss Contingencies [Line Items]
Pell grants returns reserve	$ 3,450
Revenue from Title IV program funds	80.30%	80.20%	84.90%

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- Definition

Ninety By Ten Revenue Test

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- Definition

Reserve for estimated loss.

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