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Share-Based Compensation and Other Benefit Programs - Narrative (Details) | 12 Months Ended | 72 Months Ended |
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Dec. 31, 2022 USD ($) anniversary $ / shares shares | Dec. 31, 2021 USD ($) anniversary $ / shares shares | Dec. 31, 2020 USD ($) anniversary $ / shares shares | Dec. 31, 2022 USD ($) anniversary shares | Feb. 24, 2023 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Maximum percentage of base earnings qualifying for pre-tax contributions | 100.00% |  |  |  |
Defined contribution plan, annual contribution per employee, amount | $ 20,500 |  |  |  |
Maximum catch-up amount | $ 6,500 |  |  |  |
Matching contribution percentage | 100.00% |  |  |  |
Base earnings qualifying for parent company matching contribution, percent | 6.00% |  |  |  |
Matching funds expense | $ 9,700,000 | $ 7,800,000 | $ 7,800,000 |  |
Performance-Based |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant date fair value (in usd per share) | $ / shares | $ 20.09 |  |  |  |
Performance-Based | 2021 Award Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Fair value of RSUs vested | $ 16,900,000 |  |  |  |
Award period |  | 3 years |  |  |
Performance-Based | 2020 Award Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant date fair value (in usd per share) | $ / shares |  | $ 20.39 |  |  |
Fair value of RSUs vested |  | $ 18,900,000 |  |  |
Award period |  |  | 3 years |  |
Performance-Based | 2019 Award Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant date fair value (in usd per share) | $ / shares |  |  | $ 11.91 |  |
Fair value of RSUs vested |  |  | $ 17,200,000 |  |
Performance-Based | 2022 Award Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
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 | 2020 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 | 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 | 2020 Award Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Payout percentage of target award |  | 200.00% |  |  |
Performance-Based | Maximum | 2019 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 | $ 20.61 |  |  |  |
Time-Vested | 2021 Award Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Fair value of RSUs vested | $ 10,600,000 |  |  |  |
Number of anniversaries of the grant date | anniversary |  | 3 |  |  |
Award vesting period |  | 3 years |  |  |
Time-Vested | 2020 Award Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant date fair value (in usd per share) | $ / shares |  | $ 21.71 |  |  |
Fair value of RSUs vested |  | $ 18,100,000 |  |  |
Number of anniversaries of the grant date | anniversary |  |  | 3 |  |
Award vesting period |  |  | 3 years |  |
Time-Vested | 2019 Award Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Weighted-average grant date fair value (in usd per share) | $ / shares |  |  | $ 13.49 |  |
Fair value of RSUs vested |  |  | $ 7,600,000 |  |
Time-Vested | 2022 Award Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of anniversaries of the grant date | anniversary | 3 |  |  | 3 |
Award vesting period | 3 years |  |  |  |
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 | 2020 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 |  |  |  |
Options |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expected vesting or offering term | 4 years |  |  |  |
Stock options granted (in shares) | shares |  |  |  | 0 |
Options | 2022 Award Year |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock options granted (in shares) | shares | 0 |  |  |  |
Options | Award vesting percentage on or after the third anniversary of grant date |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting rights percentage | 50.00% |  |  |  |
Options | Award vesting percentage on or after the fourth anniversary of grant date |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting rights percentage | 50.00% |  |  |  |
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 | $ 31,700,000 |  |  | $ 31,700,000 |
Period for recognition | 1 year 8 months 12 days |  |  |  |
Equity Compensation Plans | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Change of control, grantee employment termination, vesting period range (in days and years) | 90 days |  |  |  |
Equity Compensation Plans | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Change of control, grantee employment termination, vesting period range (in days and years) | 1 year |  |  |  |
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 |  |  | 8,300,000 |
Number of shares remaining available for grant (shares reserve) | shares | 8,100,000 |  |  | 8,100,000 |
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 |  |
Amended and Restated Radian Group Inc. Employee Stock Purchase Plan | ESPP | Subsequent Event |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
ESPP, number of shares available for issuance | shares |  |  |  |  | 1,500,000

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