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Acquisitions - Overview (Details) (Business Acquisition, Arminak & Associates [Member], USD $)
2 Months Ended 3 Months Ended 6 Months Ended
Feb. 23, 2012
Mar. 31, 2012
Mar. 31, 2012
Mar. 31, 2014
Dec. 31, 2012
Redeemable Noncontrolling Interest by Exercise Period [Line Items]          
Business Acquisition, Percentage of Voting Interests Acquired 70.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired        
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net $ 67,690,000us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet        
Business Combination, Consideration Transferred 67,690,000us-gaap_BusinessCombinationConsiderationTransferred1        
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners       30.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners  
Business Combination, Acquisition Related Costs   $ 1,000,000us-gaap_BusinessCombinationAcquisitionRelatedCosts $ 1,300,000us-gaap_BusinessCombinationAcquisitionRelatedCosts    
First Exercise Period [Member]
         
Redeemable Noncontrolling Interest by Exercise Period [Line Items]          
Redeemable Noncontrolling Interest, Put or Call Option         10.00%trs_RedeemableNoncontrollingInterestPutOrCallOption
/ us-gaap_BusinessAcquisitionAxis
= trs_BusinessAcquisitionArminakAssociatesMember
/ trs_RedeemableNoncontrollingInterestPutOrCallOptionExercisePeriodsAxis
= trs_FirstExercisePeriodMember
Second Exercise Period [Member]
         
Redeemable Noncontrolling Interest by Exercise Period [Line Items]          
Redeemable Noncontrolling Interest, Put or Call Option         10.00%trs_RedeemableNoncontrollingInterestPutOrCallOption
/ us-gaap_BusinessAcquisitionAxis
= trs_BusinessAcquisitionArminakAssociatesMember
/ trs_RedeemableNoncontrollingInterestPutOrCallOptionExercisePeriodsAxis
= trs_SecondExercisePeriodMember