Commitments and Contingencies - Historical and Projected Performance and Collections of the CUSO Student Loans under the CUSO RSA (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($)
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Estimated Regular Payments	$ 140,000
Estimated Recoveries	(3,800)	[1]
Estimated Total Payments, Net	136,200
2016 [Member]
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Estimated Regular Payments	18,000	[2]
Estimated Recoveries	(1,800)	[1],[3]
Estimated Total Payments, Net	16,200
2017 [Member]
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Estimated Regular Payments	13,000
Estimated Recoveries	(1,000)	[1]
Estimated Total Payments, Net	12,000
2018 [Member]
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Estimated Regular Payments	14,000
Estimated Recoveries	(1,000)	[1]
Estimated Total Payments, Net	13,000
2019 and later [Member]
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Estimated Regular Payments	95,000	[4]
Estimated Recoveries	0	[1],[4]
Estimated Total Payments, Net	$ 95,000	[4]

[1] We expect to offset Regular Payments due to the CUSO from us under the CUSO RSA by the recoveries from charged-off loans that are due to us from the CUSO.

[2] This amount includes $6,092 of Regular Payments that otherwise would have been due in 2015, but were deferred to, and paid in, January 2016 as allowed under the Sixth Amendment to CUSO RSA.

[3] This amount includes $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.

[4] We believe that the amount in this row will be paid by us in approximately equal portions in each of 2019 through 2025.