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Workers' Compensation Claims (Tables) | 9 Months Ended
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Sep. 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 |  |  | Nine Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Workers' compensation claims liabilities |  | $ | 430,736 |  |  | $ | 390,814 |  |  | $ | 413,397 |  |  | $ | 363,517 |
Add: claims expense accrual |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period |  |  | 37,404 |  |  |  | 37,784 |  |  |  | 118,934 |  |  |  | 116,803 |
Prior periods |  |  | (5,593 | ) |  |  | (2,327 | ) |  |  | (10,245 | ) |  |  | (2,333 | )
|  |  | 31,811 |  |  |  | 35,457 |  |  |  | 108,689 |  |  |  | 114,470 |
Less: claim payments related to |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period |  |  | 8,609 |  |  |  | 7,502 |  |  |  | 14,213 |  |  |  | 13,783 |
Prior periods |  |  | 23,815 |  |  |  | 19,905 |  |  |  | 77,619 |  |  |  | 65,296 |
|  |  | 32,424 |  |  |  | 27,407 |  |  |  | 91,832 |  |  |  | 79,079 |
Change in claims incurred in excess of retention limits |  |  | (77 | ) |  |  | (26 | ) |  |  | (208 | ) |  |  | (70 | )
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Workers' compensation claims liabilities |  | $ | 430,046 |  |  | $ | 398,838 |  |  | $ | 430,046 |  |  | $ | 398,838 |
Incurred but not reported (IBNR) |  | $ | 274,344 |  |  | $ | 246,174 |  |  | $ | 274,344 |  |  | $ | 246,174 |
Ratio of IBNR to workers' compensation claims liabilities |  |  | 64 | % |  |  | 62 | % |  |  | 64 | % |  |  | 62 | %

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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