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Student Receivables - Changes in Current and Non-Current Receivables Allowance (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Receivables [Abstract]        
Recoveries of amounts previously written off $ 1.5 $ 2.0 $ 5.8 $ 6.5