2.4.0.8138 - Disclosure - Regulatory Requirements (Details Textual)truefalsefalse1false USDfalsefalseP01_01_2013To06_30_2013http://www.sec.gov/CIK0000826683duration2013-01-01T00:00:002013-06-30T00:00:00USDStandardhttp://www.xbrl.org/2003/iso4217USDiso42170$1false 4us-gaap_NetCapitalus-gaap_truecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse15110001511000USD$falsetruefalsexbrli:monetaryItemTypemonetaryNet capital is equal to the net worth of the broker dealer, less certain items such as exchange memberships, carrying value of securities not readily marketable, haircuts on marketable securities in proprietary accounts, furniture and equipment and other illiquid assets as defined.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Rule 15c3 -Number 240 -Section 1 -Paragraph 1 -Subparagraph ii -Article 15c3 -Subsection a false2Net Capital2false 4merr_NetCapitalRequiredForCapitalAdequacymerr_falsecreditinstantfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1truefalsefalse12610001261000USD$falsetruefalsexbrli:monetaryItemTypemonetaryRepresents the minimum amount of net Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.No definition available.false2Net Capital Required For Capital Adequacy3false 4merr_PercentageOfCapitalLessThanAggreagateDebitBalancesmerr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse005%falsefalsefalsexbrli:stringItemTypestringRepresents Percentage of Capital Less Than Aggregate Debit Balances.No definition available.false0Percentage Of Capital Less Than Aggregate Debit BalancesfalseRegulatory Requirements (Details Textual) (USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.merrimanco.com/role/RegulatoryRequirementsDetailsTextual13