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Commitments and Contingencies - Asbestos Claimant and Settlement (Details) (Asbestos [Member], USD $)
 12 Months Ended
Dec. 31, 2014
claimants
Dec. 31, 2013
claimants
Dec. 31, 2012
claimants
Asbestos [Member]
      
Loss Contingencies [Line Items]      
Number of pending claims at the beginning of period 7,975trs_NumberOfPendingClaimsAtBeginningOfPeriod
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember		 7,880trs_NumberOfPendingClaimsAtBeginningOfPeriod
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember		 8,048trs_NumberOfPendingClaimsAtBeginningOfPeriod
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember
Number of pending claims filed during period 210trs_LossContingencyNumberOfNewPlaintiffsFilingClaimsDuringPeriod
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember		 360trs_LossContingencyNumberOfNewPlaintiffsFilingClaimsDuringPeriod
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember		 367trs_LossContingencyNumberOfNewPlaintiffsFilingClaimsDuringPeriod
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember
Number of pending claims dismissed during period 155trs_LossContingencyClaimsDismissedDuringPeriodNumberOfPlaintiffs
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember		 226trs_LossContingencyClaimsDismissedDuringPeriodNumberOfPlaintiffs
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember		 519trs_LossContingencyClaimsDismissedDuringPeriodNumberOfPlaintiffs
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember
Number of pending claims settled during period 38trs_LossContingencyClaimsSettledDuringPeriodNumberOfPlaintiffs
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember		 39trs_LossContingencyClaimsSettledDuringPeriodNumberOfPlaintiffs
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember		 16trs_LossContingencyClaimsSettledDuringPeriodNumberOfPlaintiffs
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember
Average settlement amount per claim during period $ 18,734trs_LossContingencySettlementAgreementAverageConsideration
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember		 $ 8,294trs_LossContingencySettlementAgreementAverageConsideration
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember		 $ 14,513trs_LossContingencySettlementAgreementAverageConsideration
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember
Total defense costs during period $ 2,800,000us-gaap_LegalFees
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember		 $ 2,620,000us-gaap_LegalFees
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember		 $ 2,650,000us-gaap_LegalFees
/ us-gaap_LossContingenciesByNatureOfContingencyAxis
= us-gaap_AsbestosIssueMember