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Business Combination - Summary of Estimated Fair Value of the Assets Acquired and Liabilities Assumed at the Acquisition (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Jul. 01, 2013
Oct. 24, 2012
Business Acquisition [Line Items]        
Goodwill $ 288,857us-gaap_Goodwill $ 288,857us-gaap_Goodwill    
Ambrose Employer Group, LLC (Ambrose)        
Business Acquisition [Line Items]        
Restricted cash     442us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= tnet_AmbroseEmployerGroupLlcMember
 
WSE-related assets     57,366us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= tnet_AmbroseEmployerGroupLlcMember
 
Prepaid expenses and other current assets     893us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= tnet_AmbroseEmployerGroupLlcMember
 
Goodwill     98,918us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= tnet_AmbroseEmployerGroupLlcMember
 
Identifiable intangible assets     94,380us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= tnet_AmbroseEmployerGroupLlcMember
 
Property and equipment     1,358us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= tnet_AmbroseEmployerGroupLlcMember
 
Other noncurrent assets     878us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= tnet_AmbroseEmployerGroupLlcMember
 
WSE-related liabilities     (53,115)tnet_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherClientRelatedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= tnet_AmbroseEmployerGroupLlcMember
 
Accounts payable and accrued liabilities     (5,646)tnet_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesAccountsPayableAndAccruedExpenses
/ us-gaap_BusinessAcquisitionAxis
= tnet_AmbroseEmployerGroupLlcMember
 
Deferred rent     (126)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesDeferredRevenue
/ us-gaap_BusinessAcquisitionAxis
= tnet_AmbroseEmployerGroupLlcMember
 
Other long term liabilities     (350)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= tnet_AmbroseEmployerGroupLlcMember
 
Consideration transferred     194,998us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= tnet_AmbroseEmployerGroupLlcMember
 
SOI Holdings Inc        
Business Acquisition [Line Items]        
Restricted cash       700us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember
WSE-related assets       122,135us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember
Prepaid expenses and other current assets       600us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsPrepaidExpenseAndOtherAssets
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember
Goodwill   159,500us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember
  164,616us-gaap_Goodwill
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember
Identifiable intangible assets       81,500us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember
Property and equipment       8,941us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember
Other noncurrent assets       464us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember
WSE-related liabilities       (115,902)tnet_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherClientRelatedLiabilities
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember
Accrued corporate wages       (2,611)tnet_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEmployeeRelatedLiabilitiesCurrent
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember
Deferred income taxes       (17,386)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesCurrent
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember
Current portion of notes payable and borrowings under capital leases       (579)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesLongTermDebt
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember
Other current liabilities       (3,841)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember
Other long term liabilities       (42,863)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember
Consideration transferred       $ 195,774us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet
/ us-gaap_BusinessAcquisitionAxis
= tnet_SoiHoldingsIncMember