CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Comprehensive Income [Abstract]
Consolidated net income	$ 83,451	$ 76,269	$ 70,254
Other comprehensive income, net of tax:
Foreign currency translation adjustments	(16,533)	1,479	(17,565)
Pension and postretirement plan adjustments	34,281	(7,730)	(25,630)
Sale of interest in business			(820)
Cash flow hedges [Abstract]
Reclassification adjustment	(2)	11	47
Net derivative gains (losses) arising during the period	514	(204)	529
Comprehensive income	101,711	69,825	26,815
Comprehensive income attributable to non-controlling interest	(1,448)	(1,545)	(1,035)
Comprehensive income attributable to MTI	$ 100,263	$ 68,280	$ 25,780