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Accrued Workers' Compensation Cost - Additional Information (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
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Financial Guarantee Insurance Contracts, Claim Liability [Line Items] |  |
Collateral held by insurance carriers | $ 55 | $ 57
Liability For Unpaid Claims And Claims Adjustment Expense, Collateral | $ 12 | $ 13

X
- Definition Collateral Held by Insurance Carriers + References No definition available. + Details
Name: | tnet_CollateralHeldByInsuranceCarriers
Namespace Prefix: | tnet_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Liability for Unpaid Claims and Claims Adjustment Expense, Collateral + References No definition available. + Details
Name: | tnet_LiabilityForUnpaidClaimsAndClaimsAdjustmentExpenseCollateral
Namespace Prefix: | tnet_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_FinancialGuaranteeInsuranceContractsClaimLiabilityAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration