XML 74 R58.htm IDEA: XBRL DOCUMENT
v3.20.4

Income Taxes - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 31, 2020 | Dec. 31, 2020
Federal General Business Tax Credit Carry Forward [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax credit carryforwards |  | $ 0
Alternative Minimum Tax Credit Carry Forward [Member] |  |
Income Tax Contingency [Line Items] |  |
Tax credit carryforwards |  | $ 0
Internal Revenue Service [Member] |  |
Income Tax Contingency [Line Items] |  |
Open tax years |  | 2011 2012 2013 2014
Wage based tax credits claimed amount to be disallowed results estimated additional tax due | $ 2,300,000 |
Wage-based tax credits claimed amount disallowed, tax years | 2012 through 2015 |
Reserve for tax position | $ 0 |
Internal Revenue Service [Member] | Minimum [Member] |  |
Income Tax Contingency [Line Items] |  |
Ongoing audit for tax years | 2011 |
Internal Revenue Service [Member] | Maximum [Member] |  |
Income Tax Contingency [Line Items] |  |
Ongoing audit for tax years | 2014 |

X
- Definition Wage based tax credits claimed amount to be disallowed results estimated additional tax due. + References No definition available. + Details
Name: | bbsi_WageBasedTaxCreditsClaimedAmountToBeDisallowedResultsEstimatedAdditionalTaxDue
Namespace Prefix: | bbsi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Wage based tax credits claimed amount to be disallowed tax years. + References No definition available. + Details
Name: | bbsi_WageBasedTaxCreditsClaimedAmountToBeDisallowedTaxYears
Namespace Prefix: | bbsi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_IncomeTaxContingencyLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax year being audited in the income tax examination, in CCYY format. + References No definition available. + Details
Name: | us-gaap_IncomeTaxExaminationYearUnderExamination
Namespace Prefix: | us-gaap_
Data Type: | us-types:gYearListItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount recognized for uncertainty in income taxes classified as current. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LiabilityForUncertainTaxPositionsCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Tax year that remains open to examination under enacted tax laws, in CCYY format. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
Name: | us-gaap_OpenTaxYear
Namespace Prefix: | us-gaap_
Data Type: | us-types:gYearListItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
Name: | us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=us-gaap_GeneralBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=bbsi_AlternativeMinimumTaxCreditsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityNameAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |