2.4.0.8090502 - Disclosure - Derivatives and Hedging, Effect of Trading Activities on Statements of Financial Condition (Details)truefalsefalse1false USDfalsefalse$c20130401to20130630http://www.sec.gov/CIK0001169749duration2013-04-01T00:00:002013-06-30T00:00:00U002Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$2false USDfalsefalse$c20120401to20120630http://www.sec.gov/CIK0001169749duration2012-04-01T00:00:002012-06-30T00:00:00U002Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$3false USDfalsefalse$c20130101to20130630http://www.sec.gov/CIK0001169749duration2013-01-01T00:00:002013-06-30T00:00:00U002Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$4false USDfalsefalse$c20120101to20120630http://www.sec.gov/CIK0001169749duration2012-01-01T00:00:002012-06-30T00:00:00U002Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$5false USDfalsefalse$c20121231http://www.sec.gov/CIK0001169749instant2012-12-31T00:00:000001-01-01T00:00:00U002Standardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$1true 4mscc_FuturesAndForwardContractsAbstractmscc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Futures and Forward Contracts [Abstract]2false 5us-gaap_DerivativeFairValueOfDerivativeNetus-gaap_truedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse-1975691-1975691USD$falsetruefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-1975691-1975691USD$falsetruefalse4falsefalsefalse00falsefalsefalse5truefalsefalse-1105501-1105501USD$falsetruefalsexbrli:monetaryItemTypemonetaryFair value of the assets less the liabilities of a derivative or group of derivatives.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13495-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 false2Net unrealized gain/(loss) on open contracts3false 5mscc_UnrealizedCurrencyGainLossFairValuemscc_falsedebitinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse-2387585-2387585USD$falsefalsefalse2falsefalsefalse00falsefalsefalse3truefalsefalse-2387585-2387585USD$falsefalsefalse4falsefalsefalse00falsefalsefalse5truefalsefalse-2389680-2389680USD$falsefalsefalsexbrli:monetaryItemTypemonetaryThe aggregate fair value amount of unrealized currency gain (loss) for open contract securities owned, at a point in time.No definition available.false2Unrealized currency gain (loss)4true 4mscc_EffectOfTradingActivitiesOnStatementsOfIncomeAbstractmscc_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalse3falsefalsefalse00falsefalsefalse4falsefalsefalse00falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Effect of Trading Activities on Statements of Income [Abstract]5false 5us-gaap_ForeignCurrencyTransactionGainLossUnrealizedus-gaap_truecreditdurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1truefalsefalse2423524235USD$falsefalsefalse2truefalsefalse-7370-7370USD$falsefalsefalse3truefalsefalse20942094USD$falsefalsefalse4truefalsefalse-11947-11947USD$falsefalsefalse5falsefalsefalse00falsefalsefalsexbrli:monetaryItemTypemonetaryThe aggregate unrealized foreign currency transaction gain (loss) (pretax) included in determining net income for the reporting period. 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