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Share-Based Compensation and Other Benefit Programs - Additional Information (Details) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) Anniversary $ / shares shares | Dec. 31, 2023 USD ($) Anniversary $ / shares shares | Dec. 31, 2022 USD ($) Anniversary $ / shares shares | Feb. 28, 2025 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum percentage of base earnings qualifying for pre-tax contributions | 100.00% |  |  |
Matching contribution percentage | 100.00% |  |  |
Base earnings qualifying for parent company matching contribution, percent | 6.00% |  |  |
Matching funds expense | $ 8,000 | $ 8,000 | $ 10,000 |
Performance-Based |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value (in usd per share) | $ / shares | $ 29.32 |  |  |
Performance-Based | 2021 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value (in usd per share) | $ / shares |  |  | $ 20.09 |
Fair value of RSUs vested |  |  | $ 17,000 |
Award period | 3 years |  | 3 years |
Performance-Based | 2022 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value (in usd per share) | $ / shares |  | $ 23.05 |  |
Fair value of RSUs vested |  | $ 27,000 |  |
Award period | 3 years | 3 years |  |
Performance-Based | 2023 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Fair value of RSUs vested | $ 42,000 |  |  |
Award period | 3 years |  |  |
Performance-Based | Minimum | 2021 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout percentage of target award |  |  | 0.00% |
Post-vesting holding period |  |  | 1 year |
Performance-Based | Minimum | 2022 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout percentage of target award |  | 0.00% |  |
Post-vesting holding period |  | 1 year |  |
Performance-Based | Minimum | 2023 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout percentage of target award | 0.00% |  |  |
Post-vesting holding period | 1 year |  |  |
Performance-Based | Maximum | 2021 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout percentage of target award |  |  | 200.00% |
Performance-Based | Maximum | 2022 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout percentage of target award | 200.00% | 200.00% |  |
Performance-Based | Maximum | 2023 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Payout percentage of target award | 200.00% |  |  |
Time-Vested |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Weighted-average grant date fair value (in usd per share) | $ / shares | $ 31.68 |  |  |
Time-Vested | 2021 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 3 years |
Weighted-average grant date fair value (in usd per share) | $ / shares |  |  | $ 20.61 |
Fair value of RSUs vested |  |  | $ 11,000 |
Number of anniversaries of the grant date | Anniversary |  |  | 3 |
Time-Vested | 2022 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 3 years |  |
Weighted-average grant date fair value (in usd per share) | $ / shares |  | $ 25.13 |  |
Fair value of RSUs vested |  | $ 16,000 |  |
Number of anniversaries of the grant date | Anniversary |  | 3 |  |
Time-Vested | 2023 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 3 years |  |  |
Fair value of RSUs vested | $ 19,000 |  |  |
Number of anniversaries of the grant date | Anniversary | 3 |  |  |
Time-Vested | Minimum | 2021 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  |  | 1 year |
Time-Vested | Minimum | 2022 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period |  | 1 year |  |
Time-Vested | Minimum | 2023 Award Year |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 1 year |  |  |
Options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock options granted (in shares) | shares | 0 |  |  |
2021 Equity Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares of common stock authorized for issuance | shares | 8,300,000 |  |  |
Number of shares remaining available for grant (shares reserve) | shares | 3,600,000 |  |  |
Equity Compensation Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Maximum contractual term for all awards | 10 years |  |  |
Unrecognized compensation expense | $ 26 |  |  |
Period for recognition | 1 year 9 months 18 days |  |  |
Equity Compensation Plans | Minimum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 1 year |  |  |
Equity Compensation Plans | Maximum |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 3 years |  |  |
Amended and Restated Radian Group Inc. Employee Stock Purchase Plan | ESPP |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Expected vesting or offering term | 6 months |  |  |
Discount percentage from market price | 15.00% |  |  |
Shares issued to employees under ESPP plans (in shares) | shares | 100,000 | 100,000 | 100,000 |
ESPP, number of shares available for issuance | shares |  |  |  | 1,300,000

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