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Pensions and Other Post-Employment Benefits (Details 5) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Summary of fair values of the Company's defined benefit pension plan assets    
Fair Value of Plan Assets $ 187,186us-gaap_DefinedBenefitPlanFairValueOfPlanAssets $ 173,494us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Cash [Member]    
Summary of fair values of the Company's defined benefit pension plan assets    
Fair Value of Plan Assets 6,173us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashAndCashEquivalentsMember
6,568us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashAndCashEquivalentsMember
U.S. Equities [Member]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
Fair Value of Plan Assets 8,477us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= mtrn_AlternativeStrategiesMember
[7]  
Pooled Investment Fund [Member]    
Summary of fair values of the Company's defined benefit pension plan assets    
Fair Value of Plan Assets 6,613us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= mtrn_PooledInvestmentFundMember
[7]  
Multi-strategy hedge funds [Member]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
Fair Value of Plan Assets 254us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PrivateEquityFundsMember
417us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PrivateEquityFundsMember
Level 1 [Member]    
Summary of fair values of the Company's defined benefit pension plan assets    
Fair Value of Plan Assets 150,824us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
145,333us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Level 1 [Member] | Cash [Member]    
Summary of fair values of the Company's defined benefit pension plan assets    
Fair Value of Plan Assets 6,173us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashAndCashEquivalentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
6,568us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_CashAndCashEquivalentsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
Level 1 [Member] | U.S. Equities [Member]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
Fair Value of Plan Assets 8,382us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= mtrn_AlternativeStrategiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
[7]  
Level 2 [Member]    
Summary of fair values of the Company's defined benefit pension plan assets    
Fair Value of Plan Assets 24,533us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
22,277us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
Level 2 [Member] | U.S. Equities [Member]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
Fair Value of Plan Assets 95us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= mtrn_AlternativeStrategiesMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
[7]  
Level 3 [Member]    
Summary of fair values of the Company's defined benefit pension plan assets    
Fair Value of Plan Assets 11,829us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
5,884us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Level 3 [Member] | Pooled Investment Fund [Member]    
Summary of fair values of the Company's defined benefit pension plan assets    
Fair Value of Plan Assets 6,613us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= mtrn_PooledInvestmentFundMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
[9]  
Level 3 [Member] | Multi-strategy hedge funds [Member]    
Summary of fair values of the Company's defined benefit pension plan assets    
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]    
Summary of fair values of the Company's defined benefit pension plan assets    
Fair Value of Plan Assets $ 254us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
/ us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis
= us-gaap_PrivateEquityFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
$ 417us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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= us-gaap_PrivateEquityFundsMember
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
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[1] Mutual funds that invest in various sectors of the U.S. market.
[2] Mutual funds that invest in non-U.S. companies primarily in developed countries that are generally considered to be value stocks.
[3] Mutual funds that invest in non-U.S. companies in emerging market countries.
[4] Includes a mutual fund that employs a value-oriented approach to fixed income investment management and a mutual fund that invests primarily in investment-grade debt securities.
[5] Includes a mutual fund that seeks a market rate of return for a fixed-income portfolio with low relative volatility of returns, investing generally in U.S. and foreign debt securities maturing in five years or less.
[6] Mutual funds that invest in domestic and foreign sovereign securities, fixed income securities, mortgage-backed and asset-backed bonds, convertible bonds, high-yield bonds, and emerging market bonds.
[7] Includes a mutual fund that typically invests at least 80% of its assets in equity and debt securities of companies in the real estate industry or related industries or in companies which own significant real estate assets at the time of investment.
[8] Includes a hedge fund that employs multiple strategies to multiple asset classes with low correlations.
[9] Includes a fund that invests in a broad portfolio of hedge funds.