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Revolving Credit Facility and Long-Term Debt - Additional Information (Detail) (USD $) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 29, 2014
Line of Credit Facility [Line Items] |  |
Line of credit facility commitment fee description | The Agreement also provides for an unused commitment fee of 0.35% per year on the average dailyunused amount of the revolving credit facility, and a fee of 1.75% of the face amount of each letter of credit |
Ratio of restricted and unrestricted cash and marketable securities to workers' compensation and safety incentive liabilities | 1.0 bbsi_RestrictedAndUnrestrictedCashAndMarketableSecuritiesToWorkersCompensationAndSafetyIncentiveLiabilitiesRatio |
Maximum amount of capital expenditures in 2015 | 5,000,000 bbsi_DebtInstrumentCovenantMaximumCapitalExpenditureThresholdYearOne |
Maximum amount of capital expenditures in 2016 | 4,000,000 bbsi_DebtInstrumentCovenantMaximumCapitalExpenditureThresholdYearTwo |
Wells Fargo [Member] |  |
Line of Credit Facility [Line Items] |  |
Term loan payment due June 30, 2015 | 3,000,000 bbsi_TermLoanPaymentDueInSecondQuarter / us-gaap_LineOfCreditFacilityAxis = bbsi_WellFargoMember |
Term loan payment due September 30, 2015 | 7,000,000 bbsi_TermLoanPaymentDueInThirdQuarter / us-gaap_LineOfCreditFacilityAxis = bbsi_WellFargoMember |
Term loan payment due December 31, 2015 | 15,000,000 bbsi_TermLoanPaymentDueInFourthQuarter / us-gaap_LineOfCreditFacilityAxis = bbsi_WellFargoMember |
Term loan payment due June 30, 2016 | 5,000,000 bbsi_TermLoanPaymentDueInSixQuarters / us-gaap_LineOfCreditFacilityAxis = bbsi_WellFargoMember |
Term loan payment due September 30, 2016 | 5,000,000 bbsi_TermLoanPaymentDueInSevenQuarters / us-gaap_LineOfCreditFacilityAxis = bbsi_WellFargoMember |
Minimum [Member] |  |
Line of Credit Facility [Line Items] |  |
Minimum Fixed Charge Coverage Ratio | 1.5 bbsi_FixedChargesCoverageRatio / us-gaap_RangeAxis = us-gaap_MinimumMember |
Prohibition on incurring additional indebtedness without the prior approval of the Bank in purchase money financing | 200,000 bbsi_ProhibitionForPurchaseMoneyFinancingOnIncurringAdditionalIndebtednessWithoutPriorApprovalOfBank / us-gaap_RangeAxis = us-gaap_MinimumMember |
Maximum [Member] |  |
Line of Credit Facility [Line Items] |  |
Prohibition on incurring additional indebtedness without the prior approval of the Bank in purchase money financing | 400,000 bbsi_ProhibitionForPurchaseMoneyFinancingOnIncurringAdditionalIndebtednessWithoutPriorApprovalOfBank / us-gaap_RangeAxis = us-gaap_MaximumMember |
Cash dividend | 0.22 us-gaap_DividendsPayableAmountPerShare / us-gaap_RangeAxis = us-gaap_MaximumMember |
Term Loan [Member] |  |
Line of Credit Facility [Line Items] |  |
Term loan from Bank, Interest rate description | One month LIBOR plus 2.25% |
LIBOR plus rate | 2.25%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = bbsi_TermLoanMember |
Term loan with principal bank | 5,100,000 us-gaap_SecuredDebt / us-gaap_CreditFacilityAxis = bbsi_TermLoanMember |
Payment of monthly installments of term loan | 18,375 us-gaap_LineOfCreditFacilityPeriodicPaymentPrincipal / us-gaap_CreditFacilityAxis = bbsi_TermLoanMember |
Term Loan [Member] | Wells Fargo [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit facility borrowing capacity |  | 40,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = bbsi_TermLoanMember / us-gaap_LineOfCreditFacilityAxis = bbsi_WellFargoMember
Term loan maturity date | Dec. 31, 2016 |
Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Wells Fargo [Member] |  |
Line of Credit Facility [Line Items] |  |
Term loan from Bank, Interest rate description | One month LIBOR plus 4.0% |
LIBOR plus rate | 4.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = bbsi_TermLoanMember / us-gaap_LineOfCreditFacilityAxis = bbsi_WellFargoMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |
Revolving Credit Facility [Member] |  |
Line of Credit Facility [Line Items] |  |
Outstanding borrowings on the revolving credit facility | 0 us-gaap_DebtInstrumentCarryingAmount / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |
Unused commitment fee on unused amount | 0.35%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember |
Revolving Credit Facility [Member] | Wells Fargo [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit facility borrowing capacity |  | 14,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_LineOfCreditFacilityAxis = bbsi_WellFargoMember
Revolving Credit Facility [Member] | Daily Floating Rate [Member] |  |
Line of Credit Facility [Line Items] |  |
Term loan from Bank, Interest rate description | A daily floating rate of one month LIBOR plus 2% |
LIBOR plus rate | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_VariableRateAxis = bbsi_FloatingInterestRateMember |
Revolving Credit Facility [Member] | Fixed Rate [Member] |  |
Line of Credit Facility [Line Items] |  |
Term loan from Bank, Interest rate description | A fixed rate of LIBOR plus 2.0% |
LIBOR plus rate | 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_VariableRateAxis = bbsi_FixedInterestRateMember |
Standby Letters of Credit [Member] | Wells Fargo [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit facility borrowing capacity |  | 5,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_StandbyLettersOfCreditMember / us-gaap_LineOfCreditFacilityAxis = bbsi_WellFargoMember
Cash-Secured Letters of Credit [Member] |  |
Line of Credit Facility [Line Items] |  |
Unused commitment fee on unused amount | 175.00%us-gaap_LineOfCreditFacilityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember |
Cash-Secured Letters of Credit [Member] | Wells Fargo [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit facility borrowing capacity |  | 114,300,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = bbsi_WellFargoMember
Cash-Secured Letters of Credit [Member] | Wells Fargo [Member] | Certificate of Deposits [Member] |  |
Line of Credit Facility [Line Items] |  |
Credit facility borrowing capacity | 114,300,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = bbsi_WellFargoMember |
Credit facility non-refundable commitment fee | 400,000 us-gaap_LineOfCreditFacilityCommitmentFeeAmount / us-gaap_CashAndCashEquivalentsAxis = us-gaap_CertificatesOfDepositMember / us-gaap_CreditFacilityAxis = us-gaap_LetterOfCreditMember / us-gaap_LineOfCreditFacilityAxis = bbsi_WellFargoMember |

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- Definition Debt Instrument Covenant Maximum Capital Expenditure Threshold Year One + References No definition available. + Details
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- Definition Debt Instrument Covenant Maximum Capital Expenditure Threshold Year Two + References No definition available. + Details
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- Definition Fixed Charges Coverage Ratio + References No definition available. + Details
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- Definition Prohibition for purchase money financing on incurring additional indebtedness without the prior approval of the bank. + References No definition available. + Details
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- Definition Ratio of restricted and unrestricted cash and marketable securities to workers compensation and safety incentive liabilities measured quarterly basis. + References No definition available. + Details
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- Definition Term loan payment due in fourth quarter. + References No definition available. + Details
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Balance Type: | credit
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- Definition Term loan payment due in second quarter. + References No definition available. + Details
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- Definition Term loan payment due in seven quarters. + References No definition available. + Details
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- Definition Term loan payment due in six quarters. + References No definition available. + Details
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- Definition Term loan payment due in third quarter. + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(2)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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- Definition Amount of the fee for available but unused credit capacity under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Description of the fees for amounts available, but unused under the credit facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Amount of the required periodic payment applied to principal. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition Carrying value as of the balance sheet date, including the current and noncurrent portions, of collateralized debt obligations (with maturities initially due after one year or beyond the operating cycle, if longer). Such obligations include mortgage loans, chattel loans, and any other borrowings secured by assets of the borrower. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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