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401(k) Plan (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Postemployment Benefits [Abstract] |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Match |  | 100.00% |  |
Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay |  | 4.00% |  |
Amount matched per dollar contributed by employees | $ 0.50 |  | $ 0.50 | $ 0.50
Defined Contribution Plan, Employer Discretionary Contribution Amount |  | $ 11,000,000 | $ 6,000,000 | $ 5,000,000

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- Definition Defined Contribution Plan, Employer Matching Contribution, Amount + References No definition available. + Details
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Namespace Prefix: | tnet_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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X
- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
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- References No definition available. + Details
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