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WORKERS' COMPENSATION INSURANCE AND RESERVES -Estimated future payout (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Jan. 01, 2017
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Workers' Compensation Insurance and Reserves [Abstract] |  |
2018 | $ 76,536 |
2019 | 42,611 |
2020 | 24,429 |
2021 | 15,227 |
2022 | 10,187 |
Thereafter | 56,507 |
Sub-total | 225,497 |
Excess claims | 48,826 | $ 52,900
Total | $ 274,323 |

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- Definition Discounted workers compensation reserve for excess claims. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Expected Future Workers' Compensation Payments + References No definition available. + Details
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Namespace Prefix: | tbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Expected Future Workers' Compensation Payments, After Year Five + References No definition available. + Details
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Namespace Prefix: | tbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Expected Future Workers' Compensation Payments, Next Twelve Months + References No definition available. + Details
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Namespace Prefix: | tbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Expected Future Workers' Compensation Payments, Year Five + References No definition available. + Details
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Namespace Prefix: | tbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition Expected Future Workers' Compensation Payments, Year Four + References No definition available. + Details
Name: | tbi_ExpectedFutureWorkersCompensationPaymentsYearFour
Namespace Prefix: | tbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Expected Future Workers' Compensation Payments, Year Three + References No definition available. + Details
Name: | tbi_ExpectedFutureWorkersCompensationPaymentsYearThree
Namespace Prefix: | tbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Expected Future Workers' Compensation Payments, Year Two + References No definition available. + Details
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Namespace Prefix: | tbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Workers' Compensation Insurance and Reserves [Abstract] + References No definition available. + Details
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- Definition Workers' Compensation Liability, Excluding Excess Claims Reserve + References No definition available. + Details
Name: | tbi_WorkersCompensationLiabilityExcludingExcessClaimsReserve
Namespace Prefix: | tbi_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant