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Summary of Significant Accounting Policies and Practices - Narrative (Details)
 3 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2024
USD ($)
unit
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Variable Interest Entity [Line Items]            
Contingent consideration, liability, higher estimate           $ 35,000,000
Fair value of contingent payment     $ 8,300,000 $ 9,800,000    
Reclassification adjustment     (61,602,000) 74,327,000 $ (17,709,000)  
Net loss attributable to noncontrolling interests     (8,130,000) (40,496,000) (18,154,000)  
Net (losses) gains, excluding activity attributed to noncontrolling interest investors     184,045,000 89,826,000 406,899,000  
Total equity   $ 3,183,199,000 3,299,117,000 3,200,107,000 3,183,199,000 $ 2,943,631,000
Loans classified as held for sale     $ 0 0    
Financing receivable, payment delays not significant, period (or less)     3 months      
Straight line reversion method period     2 years      
Due from federal reserve bank     $ 30,500,000 7,000,000.0    
Cash collected for customers and held     $ 22,500,000 57,500,000    
Reporting units, impaired (in units) | unit     1      
Pre tax increase (decrease) to interest income     $ 973,399,000 1,109,800,000 $ 742,806,000  
Rebate fee on consolidation loans     1.05%      
Pro ratra policy period     12 months      
Restricted Stock            
Variable Interest Entity [Line Items]            
Vesting period (up to)     10 years      
Minimum            
Variable Interest Entity [Line Items]            
Revenue, payment period     30 days      
Maximum            
Variable Interest Entity [Line Items]            
Revenue, payment period     60 days      
Stafford Loan            
Variable Interest Entity [Line Items]            
Federally insured loans repayment period     5 years      
Stafford Loan | Federally insured loans            
Variable Interest Entity [Line Items]            
Constant prepayment rate   6.00%     6.00% 5.00%
Student Loans, PLUS            
Variable Interest Entity [Line Items]            
Federally insured loans repayment period     10 years      
Federal Family Education Loan Program (FFELP) Guaranteed Loans | Minimum            
Variable Interest Entity [Line Items]            
Federally insured loans repayment period     12 years      
Federal Family Education Loan Program (FFELP) Guaranteed Loans | Maximum            
Variable Interest Entity [Line Items]            
Federally insured loans repayment period     30 years      
Private Education Loans            
Variable Interest Entity [Line Items]            
Uninsured loans, repayment period     30 years      
Consumer Loans            
Variable Interest Entity [Line Items]            
Uninsured loans, repayment period     6 years      
Other Loans, Non-Nelnet Bank            
Variable Interest Entity [Line Items]            
Financing receivable, revolving, draw period     5 years      
Other Loans, Non-Nelnet Bank | Minimum            
Variable Interest Entity [Line Items]            
Financing receivable, repayment period     5 years      
Other Loans, Non-Nelnet Bank | Maximum            
Variable Interest Entity [Line Items]            
Financing receivable, repayment period     10 years      
Consolidation loans | Federally insured loans            
Variable Interest Entity [Line Items]            
Constant prepayment rate 6.00% 5.00%     5.00% 4.00%
Increase (decrease) to net loan discount $ 800,000 $ (8,400,000)        
Pre tax increase (decrease) to interest income $ (800,000) 8,400,000        
Solar            
Variable Interest Entity [Line Items]            
Amount funded or committed to fund     $ 314,800,000      
Amount funded or committed to fund by partners     271,400,000      
Equity method investment, amount committed to fund     92,000,000.0      
Equity method investment, amount committed to fund by partners     36,400,000      
Net loss attributable to noncontrolling interests     4,599,000 37,875,000 $ 17,680,000  
Net (losses) gains, excluding activity attributed to noncontrolling interest investors     (1,878,000) (21,770,000) 972,000  
Loss from equity investment     6,477,000 59,645,000 16,708,000  
Solar | Revision of Prior Period, Reclassification, Adjustment            
Variable Interest Entity [Line Items]            
Reclassification adjustment       5,500,000 7,600,000  
Net loss attributable to noncontrolling interests       3,400,000 7,000,000.0  
Net (losses) gains, excluding activity attributed to noncontrolling interest investors       (1,700,000) (400,000)  
Total equity   $ (16,700,000)   (21,800,000) (16,700,000) $ (9,200,000)
Loan Sales | Revision of Prior Period, Reclassification, Adjustment            
Variable Interest Entity [Line Items]            
Reclassification adjustment       57,300,000 $ 11,500,000  
Venture capital funds            
Variable Interest Entity [Line Items]            
Amount funded or committed to fund     48,500,000      
Maximum exposure to loss     $ 1,500,000      
Variable Interest Entity, Primary Beneficiary | ALLO Communications            
Variable Interest Entity [Line Items]            
Ownership percentage by parent     45.00%      
Percent of operating decision voting power     43.00%      
Variable Interest Entity, Not Primary Beneficiary            
Variable Interest Entity [Line Items]            
Maximum exposure to loss     $ 141,631,000 $ 158,343,000