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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, 2014	Dec. 31, 2013	Dec. 31, 2012
Receivables [Abstract]
Recoveries of amounts previously written off	$ 5.7us-gaap_ProceedsFromRecoveriesOfLoanPreviouslyChargedOff	$ 5.1us-gaap_ProceedsFromRecoveriesOfLoanPreviouslyChargedOff	$ 6.1us-gaap_ProceedsFromRecoveriesOfLoanPreviouslyChargedOff

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- Definition

The cash inflow from loans reinstated and recovered that were previously deemed uncollectible.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromRecoveriesOfLoanPreviouslyChargedOff
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