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Student Receivables (Narrative) (Detail) (USD $)
In Millions, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Line Items]    
Student receivables written off period, days past due Greater than 90 days  
Student receivables, net of allowance for doubtful accounts and net of deferred tuition revenue $ 5.3 $ 6.1
Outstanding net recourse loan receivable $ 3.0 $ 3.2