Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Current assets
Cash and cash equivalents	$ 13,150	$ 22,774
Accounts receivable (net of allowance of $1,578 for 2014 and $1,421 for 2013)	112,780us-gaap_AccountsReceivableNetCurrent	113,012us-gaap_AccountsReceivableNetCurrent
Inventories	232,409us-gaap_InventoryNet	232,800us-gaap_InventoryNet
Prepaid expenses	14,953	16,353
Deferred income taxes	13,402us-gaap_DeferredTaxAssetsNetCurrent	10,325us-gaap_DeferredTaxAssetsNetCurrent
Total current assets	386,694us-gaap_AssetsCurrent	395,264us-gaap_AssetsCurrent
Long-term deferred income taxes	17,722us-gaap_DeferredTaxAssetsNetNoncurrent	5,941us-gaap_DeferredTaxAssetsNetNoncurrent
Property, plant, and equipment	800,671us-gaap_PropertyPlantAndEquipmentGross	782,879us-gaap_PropertyPlantAndEquipmentGross
Less allowances for depreciation, depletion, and amortization	(553,083)	(520,986)
Property, plant, and equipment — net	247,588us-gaap_PropertyPlantAndEquipmentNet	261,893us-gaap_PropertyPlantAndEquipmentNet
Intangible assets	18,559us-gaap_FiniteLivedIntangibleAssetsNet	24,248us-gaap_FiniteLivedIntangibleAssetsNet
Other assets	4,781us-gaap_OtherAssetsNoncurrent	3,874us-gaap_OtherAssetsNoncurrent
Goodwill	86,725us-gaap_Goodwill	86,725us-gaap_Goodwill
Total Assets	762,069us-gaap_Assets	777,945us-gaap_Assets
Current liabilities
Short-term debt	653us-gaap_ShortTermBorrowings	35,566us-gaap_ShortTermBorrowings
Accounts payable	36,239us-gaap_AccountsPayableCurrent	36,556us-gaap_AccountsPayableCurrent
Salaries and wages	35,448us-gaap_AccruedSalariesCurrent	28,202us-gaap_AccruedSalariesCurrent
Taxes other than income taxes	1,306	1,527
Other liabilities and accrued items	22,397us-gaap_AccruedLiabilitiesCurrent	25,122us-gaap_AccruedLiabilitiesCurrent
Unearned revenue	4,879us-gaap_DeferredRevenueCurrent	479us-gaap_DeferredRevenueCurrent
Income taxes	3,144us-gaap_AccruedIncomeTaxesCurrent	1,564us-gaap_AccruedIncomeTaxesCurrent
Total current liabilities	104,066us-gaap_LiabilitiesCurrent	129,016us-gaap_LiabilitiesCurrent
Other long-term liabilities	18,203us-gaap_OtherLiabilitiesNoncurrent	16,531us-gaap_OtherLiabilitiesNoncurrent
Retirement and post-employment benefits	103,891	80,275
Unearned income	51,796mtrn_UnearnedIncomeNoncurrent	56,490mtrn_UnearnedIncomeNoncurrent
Long-term income taxes	1,750us-gaap_AccruedIncomeTaxesNoncurrent	1,576us-gaap_AccruedIncomeTaxesNoncurrent
Deferred income taxes	617	1,469
Long-term debt	23,613us-gaap_LongTermDebtNoncurrent	29,267us-gaap_LongTermDebtNoncurrent
Shareholders’ equity
Serial preferred stock (no par value; 5,000 authorized shares, none issued)	0us-gaap_PreferredStockValue	0us-gaap_PreferredStockValue
Common stock (no par value; 60,000 authorized shares, issued shares of 27,226 for 2014 and 27,164 for 2013)	202,104us-gaap_CommonStockValue	197,576us-gaap_CommonStockValue
Retained earnings	476,277	441,518
Common stock in treasury (6,857 shares for 2014 and 6,274 shares for 2013)	(140,938)us-gaap_TreasuryStockValue	(118,151)us-gaap_TreasuryStockValue
Other comprehensive income (loss)	(82,237)	(59,888)
Other equity transactions	2,927mtrn_OtherEquityTransactions	2,266mtrn_OtherEquityTransactions
Total shareholders’ equity	458,133us-gaap_StockholdersEquity	463,321us-gaap_StockholdersEquity
Total Liabilities and Shareholders’ Equity	$ 762,069	$ 777,945

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