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Segment Information Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting [Abstract]
Export Sales from the United States of America	$ 79.8	$ 76.2	$ 82.7

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- Definition

Export Sales from the United States of America

+ References

No definition available.

+ Details

Name:	trs_ExportSalesFromUnitedStatesOfAmerica
Namespace Prefix:	trs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_SegmentReportingAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration