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Workers' Compensation Claims (Tables) | 6 Months Ended
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Jun. 30, 2020
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, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  |  |  | 2019 |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Workers' compensation claims liabilities |  | $ | 445,310 |  |  | $ | 422,872 |  |  | $ | 438,986 |  |  |  |  | $ | 413,397 |
Add: claims expense accrual |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period |  |  | 32,729 |  |  |  | 41,145 |  |  |  | 71,221 |  |  |  |  |  | 81,530 |
Prior periods |  |  | (1,373 | ) |  |  | (2,952 | ) |  |  | (2,186 | ) |  |  |  |  | (4,652 | )
|  |  | 31,356 |  |  |  | 38,193 |  |  |  | 69,035 |  |  |  |  |  | 76,878 |
Less: claim payments related to |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period |  |  | 4,527 |  |  |  | 4,145 |  |  |  | 6,077 |  |  |  |  |  | 5,604 |
Prior periods |  |  | 135,853 |  |  |  | 26,088 |  |  |  | 165,530 |  |  |  |  |  | 53,804 |
|  |  | 140,380 |  |  |  | 30,233 |  |  |  | 171,607 |  |  |  |  |  | 59,408 |
Change in claims incurred in excess of retention limits |  |  | 218 |  |  |  | (96 | ) |  |  | 90 |  |  |  |  |  | (131 | )
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Workers' compensation claims liabilities |  | $ | 336,504 |  |  | $ | 430,736 |  |  | $ | 336,504 |  |  |  |  | $ | 430,736 |
Incurred but not reported (IBNR) |  | $ | 206,521 |  |  | $ | 273,114 |  |  | $ | 206,521 |  |  |  |  | $ | 273,114 |
Ratio of IBNR to workers' compensation claims liabilities |  |  | 61 | % |  |  | 63 | % |  |  | 61 | % |  |  |  |  | 63 | %

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