Earnings Per Share (EPS) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012
Basic EPS
Net income attributable to MTI	$ 18,756	$ 18,032
Weighted average shares outstanding	34,996,000	35,436,000
Basic earnings per share attributable to MTI	$ 0.54	$ 0.51
Diluted EPS
Net income attributable to MTI	$ 18,756	$ 18,032
Weighted average shares outstanding	34,996,000	35,436,000
Dilutive effect of stock options and stock units	300,000	200,000
Weighted average shares outstanding , adjusted	35,253,000	35,600,000
Diluted earnings per share attributable to MTI	$ 0.53	$ 0.51
Anti-dilutive options not included in the weighted average common shares outstanding calculation	239,770	257,886