XML 60 R37.htm IDEA: XBRL DOCUMENT
v3.19.1

Accrued Workers' Compensation Cost - Additional Information (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financial Guarantee Insurance Contracts, Claim Liability [Line Items] |  |
Collateral held by insurance carriers | $ 56 | $ 57
Liability For Unpaid Claims And Claims Adjustment Expense, Collateral | $ 13 | 13
Collateral for workers' compensation claims |  |
Financial Guarantee Insurance Contracts, Claim Liability [Line Items] |  |
Liability For Unpaid Claims And Claims Adjustment Expense, Collateral |  | $ 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

X
- Details
Name: | us-gaap_NatureOfExpenseAxis=tnet_WorkersCompensationClaimsCollateralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |