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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Receivables [Abstract]        
Recoveries of amounts previously written off $ 2.2 $ 2.1 $ 4.5 $ 4.2