Variable Interest Entities - Schedule of Payments Made to Entity Related to Guarantee Obligations (Detail) - CUSO RSA [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016		Mar. 31, 2015
Variable Interest Entity [Line Items]
Regular Payments	$ 2,597	[1],[2]	$ 2,280	[3],[4]
Deferred Payment	5,331	[5]	0
Discharge Payments	0		2,709
Net guarantee obligation payments	$ 7,928		$ 4,989

[1] This amount is net of $294 of recoveries from charged-off loans owed to us that we offset against amounts owed by us under the CUSO RSA.

[2] This amount is net of $294 of recoveries from charged-off loans owed to us that we offset against amounts we owed under the CUSO RSA.

[3] This amount is net of $290 of recoveries from charged-off loans owed to us that we offset against amounts owed by us under the CUSO RSA.

[4] This amount is net of $290 of recoveries from charged-off loans owed to us that we offset against amounts we owed under the CUSO RSA.

[5] This amount is net of $761 of recoveries from charged-off loans received by the CUSO from June 8, 2015 through December 31, 2015 that were not paid to us that we offset against amounts owed by us under the CUSO RSA in January 2016.