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Student Receivables - Changes in Current and Non-Current Receivables Allowance (Parenthetical) (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Receivables [Abstract]      
Recoveries of amounts previously written off $ 7.5 $ 7.8 $ 8.8