Pensions and Other Post-Employment Benefits (Details 5) (USD $) In Thousands, unless otherwise specified
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Dec. 31, 2014
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Dec. 31, 2013
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
$ 187,186us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |
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$ 173,494us-gaap_DefinedBenefitPlanFairValueOfPlanAssets |
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Cash [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
6,173us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember |
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6,568us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember |
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U.S. Equities [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
60,028us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_USEquitySecuritiesMember |
[1] |
63,321us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_USEquitySecuritiesMember |
[1] |
International Equities [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
28,372us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_InternationalSecuritiesMember |
[2] |
27,403us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_InternationalSecuritiesMember |
[2] |
Emerging Markets Equities [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
13,498us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_EmergingMarketsMember |
[3] |
14,165us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_EmergingMarketsMember |
[3] |
Intermediate-term bonds [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
18,635us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_IntermediateTermBondsMember |
[4] |
21,874us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_IntermediateTermBondsMember |
[4] |
Short-term bonds [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
3,631us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_ShortTermBondsMember |
[5] |
11,608us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_ShortTermBondsMember |
[5] |
Global bonds [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
30,030us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_GlobalBondsMember |
[6] |
12,728us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_GlobalBondsMember |
[6] |
Real estate fund [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
6,513us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember |
[7] |
9,943us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember |
[7] |
Alternative Strategies [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
8,477us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_AlternativeStrategiesMember |
[7] |
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Pooled Investment Fund [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
6,613us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_PooledInvestmentFundMember |
[7] |
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Multi-strategy hedge funds [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
4,962us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember |
[8] |
5,467us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember |
[8] |
Private equity funds [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
254us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_PrivateEquityFundsMember |
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417us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_PrivateEquityFundsMember |
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Level 1 [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
150,824us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
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145,333us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
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Level 1 [Member] | Cash [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
6,173us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
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6,568us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_CashAndCashEquivalentsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
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Level 1 [Member] | U.S. Equities [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
49,625us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_USEquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[1] |
54,095us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_USEquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[1] |
Level 1 [Member] | International Equities [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
25,361us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_InternationalSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[2] |
23,911us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_InternationalSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[2] |
Level 1 [Member] | Emerging Markets Equities [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
13,300us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_EmergingMarketsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[3] |
13,908us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_EmergingMarketsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[3] |
Level 1 [Member] | Intermediate-term bonds [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
14,755us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_IntermediateTermBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[4] |
14,482us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_IntermediateTermBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[4] |
Level 1 [Member] | Short-term bonds [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_ShortTermBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[5] |
11,608us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_ShortTermBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[5] |
Level 1 [Member] | Global bonds [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
26,795us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_GlobalBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[6] |
10,879us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_GlobalBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[6] |
Level 1 [Member] | Real estate fund [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
6,433us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[7] |
9,882us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[7] |
Level 1 [Member] | Alternative Strategies [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
8,382us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_AlternativeStrategiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member |
[7] |
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Level 2 [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
24,533us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
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22,277us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
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Level 2 [Member] | U.S. Equities [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
10,403us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_USEquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[1] |
9,226us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_USEquitySecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[1] |
Level 2 [Member] | International Equities [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
3,011us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_InternationalSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[2] |
3,492us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_InternationalSecuritiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[2] |
Level 2 [Member] | Emerging Markets Equities [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
198us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_EmergingMarketsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[3] |
257us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_EmergingMarketsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[3] |
Level 2 [Member] | Intermediate-term bonds [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
3,880us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_IntermediateTermBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[4] |
7,392us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_IntermediateTermBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[4] |
Level 2 [Member] | Short-term bonds [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
3,631us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_ShortTermBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[5] |
0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_ShortTermBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[5] |
Level 2 [Member] | Global bonds [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
3,235us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_GlobalBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[6] |
1,849us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_GlobalBondsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[6] |
Level 2 [Member] | Real estate fund [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
80us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[7] |
61us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_RealEstateMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[7] |
Level 2 [Member] | Alternative Strategies [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
95us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_AlternativeStrategiesMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member |
[7] |
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Level 3 [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
11,829us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
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5,884us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
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Level 3 [Member] | Pooled Investment Fund [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
6,613us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = mtrn_PooledInvestmentFundMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
[9] |
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Level 3 [Member] | Multi-strategy hedge funds [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
4,962us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
[8] |
5,467us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_HedgeFundsMultistrategyMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
[8] |
Level 3 [Member] | Private equity funds [Member] |
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Summary of fair values of the Company's defined benefit pension plan assets |
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Fair Value of Plan Assets |
$ 254us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_PrivateEquityFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
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$ 417us-gaap_DefinedBenefitPlanFairValueOfPlanAssets / us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis = us-gaap_PrivateEquityFundsMember / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |
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