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Accrued Workers' Compensation Costs - Narrative (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Insurance [Abstract]
Collateral held by insurance carriers	$ 57	$ 63
Collateral paid to carriers and offset against loss reserves	$ 13	$ 23

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- 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

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- 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

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- References

No definition available.

+ Details

Name:	us-gaap_InsuranceAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration