XML 77 R63.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Stock Incentive Plan (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2024
Share-Based Payment Arrangement [Abstract] |
Schedule of Nonvested Restricted Stock Units Activity | The following table summarizes RSU information for the three years ended December 31, 2024:
| 2024 |  | 2023 |  | 2022
RSUs granted and unvested at beginning of period: | 6,435,267 |  |  | 6,927,639 |  |  | 7,716,779 |
Granted | 1,217,056 |  |  | 1,647,690 |  |  | 1,537,440 |
Vested | (1,594,183) |  |  | (1,726,956) |  |  | (1,888,020) |
Canceled | (323,743) |  |  | (413,106) |  |  | (438,560) |
RSUs granted and unvested at end of period: | 5,734,397 |  |  | 6,435,267 |  |  | 6,927,639 |
Schedule of Share-based Compensation, Unearned Compensation Related to RSU's | The fair value of RSUs at the date of grant are recorded as unearned compensation, a component of stockholders’ equity, and expensed over the vesting period. Following is a summary of changes in unearned compensation for the three years ended December 31, 2024:
(In thousands) | 2024 |  | 2023 |  | 2022
Unearned compensation at beginning of year | $ | 148,080 |  |  | $ | 142,060 |  |  | $ | 135,535 |
RSUs granted, net of cancellations | 63,347 |  |  | 62,418 |  |  | 60,628 |
RSUs expensed | (52,380) |  |  | (49,200) |  |  | (47,611) |
RSUs forfeitures | (5,718) |  |  | (7,198) |  |  | (6,492) |
Unearned compensation at end of year | $ | 153,329 |  |  | $ | 148,080 |  |  | $ | 142,060 |

X
- References No definition available. + Details
Name: | us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the change in restricted stock units (RSUs). + References No definition available. + Details
Name: | us-gaap_ScheduleOfUnvestedRestrictedStockUnitsRollForwardTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule of Share-based Compensation, Unearned Compensation Related to RSU's [Table Text Block] + References No definition available. + Details
Name: | wrb_ScheduleOfShareBasedCompensationUnearnedCompensationRelatedToRsusTableTextBlock
Namespace Prefix: | wrb_
Data Type: | dtr-types1:textBlockItemType
Balance Type: | na
Period Type: | duration