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Commitments and Contingencies - Additional Information (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Other Commitments [Line Items]      
Rent expense incurred but not paid $ 11.9us-gaap_LeaseAndRentalExpense $ 9.9us-gaap_LeaseAndRentalExpense $ 7.3us-gaap_LeaseAndRentalExpense
2015      
Other Commitments [Line Items]      
Sublease income to be received under-cancelable subleases 0.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals
/ us-gaap_LeaseArrangementTypeAxis
= tnet_FiscalYearOneMember		    
2016      
Other Commitments [Line Items]      
Sublease income to be received under-cancelable subleases $ 0.3us-gaap_OperatingLeasesFutureMinimumPaymentsDueFutureMinimumSubleaseRentals
/ us-gaap_LeaseArrangementTypeAxis
= tnet_FiscalYearTwoMember