PEAKS Trust Student Loans - Schedule of Information Regarding Changes in Allowance for Loan Losses (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for loan losses	$ 8,648	$ 16,382	$ 4,319	$ 0	$ 29,349	$ 0	$ 0
PEAKS Trust Student Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Beginning balance				0	0
Loans charged off					0
Recoveries from charged off loans					0
Provision for loan losses					29,349
Ending balance	$ 29,349				$ 29,349