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Workers' Compensation Claims (Tables) | 6 Months Ended
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Jun. 30, 2017
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, |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Beginning balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Workers' compensation claims liabilities |  | $ | 326,233 |  |  | $ | 265,142 |  |  | $ | 312,537 |  |  | $ | 255,675 |
Add: claims expense accrual |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period |  |  | 37,878 |  |  |  | 34,627 |  |  |  | 73,153 |  |  |  | 65,781 |
Prior periods |  |  | 2,350 |  |  |  | (1,396 | ) |  |  | 5,264 |  |  |  | (548 | )
|  |  | 40,228 |  |  |  | 33,231 |  |  |  | 78,417 |  |  |  | 65,233 |
Less: claim payments related to |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current period |  |  | 4,148 |  |  |  | 3,698 |  |  |  | 5,280 |  |  |  | 4,969 |
Prior periods |  |  | 25,998 |  |  |  | 17,625 |  |  |  | 49,462 |  |  |  | 38,889 |
|  |  | 30,146 |  |  |  | 21,323 |  |  |  | 54,742 |  |  |  | 43,858 |
Add: Change in claims incurred in excess of retention limits |  |  | (6,236 | ) |  |  | — |  |  |  | (6,133 | ) |  |  | — |
Ending balance |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Workers' compensation claims liabilities |  | $ | 330,079 |  |  | $ | 277,050 |  |  | $ | 330,079 |  |  | $ | 277,050 |
Incurred but not reported (IBNR) |  | $ | 167,693 |  |  | $ | 140,115 |  |  | $ | 167,693 |  |  | $ | 140,115 |

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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_
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Balance Type: | na
Period Type: | duration