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Workers' Compensation Claims (Tables) | 6 Months Ended
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Jun. 30, 2019
Text Block [Abstract] |
Summarizes Aggregate Workers' Compensation Reserve Activity | The following table summarizes the aggregate workers’ compensation reserve activity (in thousands):
|  | Three Months Ended |  |  | Six Months Ended |
|  | June 30, |  |  | June 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Workers' compensation claims liabilities |  | $ | 422,872 |  |  | $ | 378,874 |  |  | $ | 413,397 |  |  | $ | 363,517 |
Add: claims expense accrual |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period |  |  | 41,145 |  |  |  | 39,967 |  |  |  | 81,530 |  |  |  | 79,019 |
Prior periods |  |  | (2,952 | ) |  |  | — |  |  |  | (4,652 | ) |  |  | (6 | )
|  |  | 38,193 |  |  |  | 39,967 |  |  |  | 76,878 |  |  |  | 79,013 |
Less: claim payments related to |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period |  |  | 4,145 |  |  |  | 5,148 |  |  |  | 5,604 |  |  |  | 6,281 |
Prior periods |  |  | 26,088 |  |  |  | 22,856 |  |  |  | 53,804 |  |  |  | 45,391 |
|  |  | 30,233 |  |  |  | 28,004 |  |  |  | 59,408 |  |  |  | 51,672 |
Add: Change in claims incurred in excess of retention limits |  |  | (96 | ) |  |  | (23 | ) |  |  | (131 | ) |  |  | (44 | )
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Workers' compensation claims liabilities |  | $ | 430,736 |  |  | $ | 390,814 |  |  | $ | 430,736 |  |  | $ | 390,814 |
Incurred but not reported (IBNR) |  | $ | 273,114 |  |  | $ | 231,702 |  |  | $ | 273,114 |  |  | $ | 231,702 |
Ratio of IBNR to workers' compensation claims liabilities |  |  | 63 | % |  |  | 59 | % |  |  | 63 | % |  |  | 59 | %

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- Definition Workers compensation reserve activity. + References No definition available. + Details
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Namespace Prefix: | bbsi_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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