PEAKS Trust Student Loans - Additional Information (Detail) - USD ($) $ in Thousands	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Feb. 28, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	$ 0	$ 0	$ 0	$ 0
PEAKS Trust [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Allowance for loan losses	0		0	0
Future payments on loans				487,800
Non accretable difference				274,700
Loans, outstanding amount	263,960
Loans, carrying amount	$ 83,332		$ 112,289
Analogy [Member] | PEAKS Trust [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Future payments on loans				213,600
Non accretable difference				$ 94,600