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Finance Receivables, Credit Quality Information, and Allowance for Credit Losses - Amortized Cost Basis in Past-Due Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 2,053,017 | $ 1,892,535 | $ 1,819,756
Net finance receivables in nonaccrual status | $ 89,688 | $ 88,830 |
Total net finance receivables | 100.00% | 100.00% |
Net finance receivables in nonaccrual status | 4.40% | 4.70% |
Large Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 1,512,140 | $ 1,336,780 | 1,293,410
Net finance receivables in nonaccrual status | $ 54,994 | $ 54,228 |
Total net finance receivables | 100.00% | 100.00% |
Net finance receivables in nonaccrual status | 3.60% | 4.10% |
Small Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 540,877 | $ 555,755 | $ 526,346
Net finance receivables in nonaccrual status | $ 34,694 | $ 34,602 |
Total net finance receivables | 100.00% | 100.00% |
Net finance receivables in nonaccrual status | 6.40% | 6.20% |
Financing Receivables, Current [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 1,740,356 | $ 1,590,381 |
Current,Percent | 84.80% | 84.00% |
Financing Receivables, Current [Member] | Large Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 1,307,304 | $ 1,139,070 |
Current,Percent | 86.40% | 85.20% |
Financing Receivables, Current [Member] | Small Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 433,052 | $ 451,311 |
Current,Percent | 80.10% | 81.20% |
1 to 29 Days Past Due [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 168,380 | $ 156,312 |
Past due, Percent | 8.20% | 8.30% |
1 to 29 Days Past Due [Member] | Large Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 118,971 | $ 109,656 |
Past due, Percent | 7.90% | 8.20% |
1 to 29 Days Past Due [Member] | Small Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 49,409 | $ 46,656 |
Past due, Percent | 9.10% | 8.40% |
Delinquent Accounts 30 to 59 Days [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 40,100 | $ 36,948 |
Past due, Percent | 1.90% | 1.90% |
Delinquent Accounts 30 to 59 Days [Member] | Large Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 24,676 | $ 22,909 |
Past due, Percent | 1.70% | 1.70% |
Delinquent Accounts 30 to 59 Days [Member] | Small Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 15,424 | $ 14,039 |
Past due, Percent | 2.90% | 2.50% |
Delinquent Accounts 60 to 89 Days [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 31,914 | $ 35,242 |
Past due, Percent | 1.60% | 1.90% |
Delinquent Accounts 60 to 89 Days [Member] | Large Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 18,842 | $ 21,493 |
Past due, Percent | 1.20% | 1.60% |
Delinquent Accounts 60 to 89 Days [Member] | Small Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 13,072 | $ 13,749 |
Past due, Percent | 2.40% | 2.50% |
Delinquent Accounts 90 to 119 Days [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 26,304 | $ 28,085 |
Past due, Percent | 1.20% | 1.50% |
Delinquent Accounts 90 to 119 Days [Member] | Large Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 15,496 | $ 16,609 |
Past due, Percent | 1.00% | 1.30% |
Delinquent Accounts 90 to 119 Days [Member] | Small Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 10,808 | $ 11,476 |
Past due, Percent | 2.00% | 2.10% |
Delinquent Accounts 120 to 149 Days [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 23,722 | $ 23,987 |
Past due, Percent | 1.20% | 1.30% |
Delinquent Accounts 120 to 149 Days [Member] | Large Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 13,992 | $ 14,357 |
Past due, Percent | 0.90% | 1.10% |
Delinquent Accounts 120 to 149 Days [Member] | Small Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 9,730 | $ 9,630 |
Past due, Percent | 1.80% | 1.70% |
Delinquent Accounts 150 to 179 Days [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 22,241 | $ 21,580 |
Past due, Percent | 1.10% | 1.10% |
Delinquent Accounts 150 to 179 Days [Member] | Large Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 12,859 | $ 12,686 |
Past due, Percent | 0.90% | 0.90% |
Delinquent Accounts 150 to 179 Days [Member] | Small Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 9,382 | $ 8,894 |
Past due, Percent | 1.70% | 1.60% |
Total Delinquency Accounts [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 144,281 | $ 145,842 |
Past due, Percent | 7.00% | 7.70% |
Total Delinquency Accounts [Member] | Large Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 85,865 | $ 88,054 |
Past due, Percent | 5.70% | 6.60% |
Total Delinquency Accounts [Member] | Small Loans [Member] |  |  |
Financing Receivable Recorded Investment [Line Items] |  |  |
Total | $ 58,416 | $ 57,788 |
Past due, Percent | 10.80% | 10.40% |

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