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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Loan reserves $ 85,100 $ 62,603
Stock-based compensation plans 9,312 10,216
Deferred revenue 1,081 782
Operating loss carryovers 0 4,186
Accrued expenses not currently deductible 12,896 5,356
Unrecorded tax benefits 5,106 3,781
Market value adjustments on student loans, investments and derivatives 1,460 1,974
Other 953 436
Total deferred tax assets 115,908 89,334
Deferred tax liabilities:    
Gains on repurchased debt 0 40,175
Fixed assets 7,150 5,303
Acquired intangible assets 5,179 4,595
Unrealized gains 3,436 1,104
Federal deferred for state receivable 2,083 3,584
Federal deferred for state receivable 1,971 1,051
Other 285 298
Total deferred tax liabilities 20,104 56,110
Net deferred tax assets $ 95,804 $ 33,224