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PEAKS Trust Student Loans - Schedule of Information Regarding Changes in Allowance for Loan Losses (Detail) - PEAKS Trust [Member] - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Balance at beginning of period $ 29,349 $ 0
Loans charged off 0 0
Recoveries from charged off loans 0 0
Provision (benefit) for loan losses 0 0
Balance at end of period $ 29,349 $ 0