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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, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recoveries of amounts previously written off | $ 10.1 | $ 10.0 | $ 9.6

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

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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