Goodwill and Other Intangible Assets - Goodwill Narrative (Details) (Minimum [Member])	12 Months Ended
Dec. 31, 2010
Minimum [Member]
Goodwill [Line Items]
Estimated Fair Value Exceeding Carrying Value, Percentage	30.00%

Percentage by which estimated fair value exceeds carrying value.

No definition available.

Name:	trs_EstimatedFairValueExceedingCarryingValuePercentage
Namespace Prefix:	trs_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration