Commitments and Contingencies - Estimated Amounts of Regular, Discharge Payments Expected to Pay and Estimated Recoveries from Charged-off Loans (Parenthetical) (Detail) - USD ($) $ in Thousands			3 Months Ended
	Jun. 10, 2015	Mar. 19, 2015	Mar. 31, 2015	Mar. 31, 2014
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Estimated Total Payments			$ 125,224
CUSO RSA [Member]
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Regular Payments			2,280	$ 1,158
Recoveries from charged-off loans			290
Discharge Payments			2,709	$ 0
Sixth Amendment [Member] | CUSO RSA [Member]
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Estimated Total Payments			$ 6,544
Fifth Amendment [Member] | CUSO RSA [Member]
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Discharge Payments		$ 2,709
Subsequent Event [Member] | Sixth Amendment [Member] | CUSO RSA [Member]
Summary Of Projections Of Estimated Payments And Recoveries [Line Items]
Discharge Payments	$ 6,544