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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
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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

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- Definition The cash inflow from loans reinstated and recovered that were previously deemed uncollectible. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration