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Common Stock and Stock-based Compensation (Details 5) (SARs Activity [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
SARs Activity [Member]
 
Summary of Company's SARs activity  
Number of options outstanding, Beginning Balance 984us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of shares, Granted in Period 143us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of shares, Exercised In Period (154)mtrn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of shares, Forfeited in Period (5)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of options outstanding, Ending Balance 968us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of options outstanding, vested and expected to vest 968mtrn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedAndExpectedToVestOutstandingNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of options outstanding, exercisable 504mtrn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsExercisableNumber
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of options outstanding, Weighted Average Exercise Price Per Share, Beginning of Period $ 26.34mtrn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of options, Granted in Period, Weighted Average Exercise Price Per Share $ 33.29mtrn_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of options exercised, Weighted Average Exercise Price Per Share $ 20.15mtrn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsExercisesInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of options canceled, Weighted Average Exercise Price Per Share $ 33.30mtrn_ShareBasedCompensationArrangementbyShareBasedPaymentAwardOtherThanOptionsForfeituresinPeriodWeightedAverageExercisePrice.
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of options outstanding, Weighted Average Exercise Price Per Share, End of Period $ 28.32mtrn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of options outstanding, Weighted Average Exercise Price Per Share, vested and expected to vest $ 28.32mtrn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of options outstanding, exercisable, Weighted Average Exercise Price Per Share $ 26.51mtrn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsExercisableWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of options, outstanding, Aggregate Intrinsic Value $ 7,633mtrn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsOutstandingIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of options, vested and expected to vest, Aggregate Intrinsic Value 7,633mtrn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of options, exercisable, Aggregate Intrinsic Value $ 5,334mtrn_ShareBasedCompensationArrangementByShareBasedPaymentAwardOtherThanOptionsExercisableIntrinsicValue1
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Number of options, outstanding, Weighted Average Remaining Contractual Term 4 years 4 months 24 days
Number of options, vested and expected to vest, Weighted Average Remaining Contractual Term 4 years 4 months 24 days
Number of options, exercisable, Weighted Average Remaining Contractual Term 3 years 7 months 6 days