Commitments and Contingencies - Estimated Amounts of Regular, Discharge Payments Expected to Pay and Estimated Recoveries from Charged-off Loans (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2015 USD ($)
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Estimated Regular Payments	$ 35,331
Estimated Discharge Payments	74,427
Estimated Recoveries	(5,350)
Estimated Total Payments, Net	104,408	[1]
2014 [Member]
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Estimated Regular Payments	0	[2]
Estimated Discharge Payments	0
Estimated Recoveries	0	[3]
Estimated Total Payments, Net	0	[2],[3]
2015 [Member]
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Estimated Regular Payments	20,415	[2]
Estimated Discharge Payments	0
Estimated Recoveries	(2,255)	[4]
Estimated Total Payments, Net	18,160	[2],[4]
2016 [Member]
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Estimated Regular Payments	14,916
Estimated Discharge Payments	0
Estimated Recoveries	(1,535)
Estimated Total Payments, Net	13,381
2017 [Member]
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Estimated Regular Payments	0
Estimated Discharge Payments	74,427
Estimated Recoveries	(1,560)
Estimated Total Payments, Net	$ 72,867

[1] The estimated amount of future payments under the CUSO RSA assumes that an offset that we made in 2013 of certain payment obligations under the CUSO RSA against the CUSO's obligations owed to us under the Revolving Note will not be determined to have been improper. See "- PEAKS Program and CUSO RSA Payments in Certain Periods" below for a further discussion of that offset. In the event that offset is determined to be improper, we may be required to pay the CUSO approximately $9,900, net of approximately $1,049 of recoveries from charged-off loans, which would be in addition to the estimated payment amounts set forth in this table.

[2] This amount assumes that, pursuant to the Sixth Amendment to CUSO RSA, we elect to defer to 2016 all additional CUSO RSA payments that otherwise would have become due in 2015 after June 8, 2015, which we estimate will be approximately $6,313.

[3] This amount excludes $779 of recoveries from charged-off loans that we have estimated were or will be received by the CUSO between June 8, 2015 and December 31, 2015 and owed to us, which we expect to offset against amounts paid by us under the CUSO RSA in 2016.

[4] This amount reflects (a) recoveries from charged-off loans that we have estimated will be received by the CUSO between June 8, 2015 and December 31, 2015 and owed to us, which we expect to offset against amounts paid by us under the CUSO RSA in 2016, and (b) recoveries from charged-off loans that we estimate will be received by the CUSO, owed to us and offset against amounts paid by us in 2016.