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Goodwill And Other Intangible Assets - Schedule of Goodwill and Other Intangible Assets (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]    
Goodwill, Gross Carrying Amount $ 288,857us-gaap_GoodwillGross $ 288,857us-gaap_GoodwillGross
Goodwill, Net Carrying Amount 288,857us-gaap_Goodwill 288,857us-gaap_Goodwill
Other Intangible Assets, Weighted Average Amortization Period 4 years 4 years
Other Intangible Assets, Gross Carrying Amount 229,690us-gaap_FiniteLivedIntangibleAssetsGross 229,690us-gaap_FiniteLivedIntangibleAssetsGross
Other Intangible Assets, Accumulated Amortization (147,972)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization (95,670)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Other Intangible Assets, Net Carrying Amount 81,718us-gaap_FiniteLivedIntangibleAssetsNet 134,020us-gaap_FiniteLivedIntangibleAssetsNet
Goodwill and Other Intangible Assets, Gross Carrying Amount 518,547tnet_IntangibleAssetsIncludingGoodwillGross 518,547tnet_IntangibleAssetsIncludingGoodwillGross
Goodwill and Other Intangible Assets, Net Carrying Amount 370,575us-gaap_IntangibleAssetsNetIncludingGoodwill 422,877us-gaap_IntangibleAssetsNetIncludingGoodwill
Minimum    
Finite-Lived Intangible Assets [Line Items]    
Other Intangible Assets, Weighted Average Amortization Period 2 years  
Maximum    
Finite-Lived Intangible Assets [Line Items]    
Other Intangible Assets, Weighted Average Amortization Period 6 years  
Customer Contracts    
Finite-Lived Intangible Assets [Line Items]    
Other Intangible Assets, Gross Carrying Amount 209,850us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
209,850us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
Other Intangible Assets, Accumulated Amortization (134,454)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
(88,579)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
Other Intangible Assets, Net Carrying Amount 75,396us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
121,271us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_CustomerContractsMember
Customer Contracts | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Other Intangible Assets, Weighted Average Amortization Period 3 years 3 years
Customer Contracts | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Other Intangible Assets, Weighted Average Amortization Period 5 years 5 years
Trademarks    
Finite-Lived Intangible Assets [Line Items]    
Other Intangible Assets, Weighted Average Amortization Period 3 years 3 years
Other Intangible Assets, Gross Carrying Amount 16,900us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
16,900us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Other Intangible Assets, Accumulated Amortization (11,761)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
(6,128)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Other Intangible Assets, Net Carrying Amount 5,139us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
10,772us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_TrademarksMember
Developed technology    
Finite-Lived Intangible Assets [Line Items]    
Other Intangible Assets, Weighted Average Amortization Period 5 years 5 years
Other Intangible Assets, Gross Carrying Amount 1,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
1,000us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Other Intangible Assets, Accumulated Amortization (533)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
(333)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Other Intangible Assets, Net Carrying Amount 467us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
667us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_DevelopedTechnologyRightsMember
Non-compete Agreements    
Finite-Lived Intangible Assets [Line Items]    
Other Intangible Assets, Gross Carrying Amount 1,940us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
1,940us-gaap_FiniteLivedIntangibleAssetsGross
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Other Intangible Assets, Accumulated Amortization (1,224)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
(630)us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Other Intangible Assets, Net Carrying Amount $ 716us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
$ 1,310us-gaap_FiniteLivedIntangibleAssetsNet
/ us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis
= us-gaap_NoncompeteAgreementsMember
Non-compete Agreements | Minimum    
Finite-Lived Intangible Assets [Line Items]    
Other Intangible Assets, Weighted Average Amortization Period 2 years 2 years
Non-compete Agreements | Maximum    
Finite-Lived Intangible Assets [Line Items]    
Other Intangible Assets, Weighted Average Amortization Period 3 years 3 years