<?xml version="1.0" encoding="utf-8"?>
<xbrl
  xmlns="http://www.xbrl.org/2003/instance"
  xmlns:dei="http://xbrl.sec.gov/dei/2019-01-31"
  xmlns:ftai="http://ftandi.com/20191031"
  xmlns:link="http://www.xbrl.org/2003/linkbase"
  xmlns:us-gaap="http://fasb.org/us-gaap/2019-01-31"
  xmlns:xbrldi="http://xbrl.org/2006/xbrldi"
  xmlns:xlink="http://www.w3.org/1999/xlink">
    <link:schemaRef xlink:href="ftai-20191031.xsd" xlink:type="simple"/>
    <context id="c20191031to20191031">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001590364</identifier>
        </entity>
        <period>
            <startDate>2019-10-31</startDate>
            <endDate>2019-10-31</endDate>
        </period>
    </context>
    <context id="c20191031to20191031_StatementClassOfStockAxis_Eight25FixedToFloatingRateSeriesACumulativePerpetualRedeemablePreferredSharesMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001590364</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">ftai:Eight25FixedToFloatingRateSeriesACumulativePerpetualRedeemablePreferredSharesMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-10-31</startDate>
            <endDate>2019-10-31</endDate>
        </period>
    </context>
    <context id="c20191031to20191031_StatementClassOfStockAxis_CommonClassAMember">
        <entity>
            <identifier scheme="http://www.sec.gov/CIK">0001590364</identifier>
            <segment>
                <xbrldi:explicitMember dimension="us-gaap:StatementClassOfStockAxis">us-gaap:CommonClassAMember</xbrldi:explicitMember>
            </segment>
        </entity>
        <period>
            <startDate>2019-10-31</startDate>
            <endDate>2019-10-31</endDate>
        </period>
    </context>
    <dei:AmendmentFlag
      contextRef="c20191031to20191031"
      id="Fact_b6dec1170a49496bb694a773fe71d069">false</dei:AmendmentFlag>
    <dei:EntityCentralIndexKey
      contextRef="c20191031to20191031"
      id="Fact_c965dfb5d9a1427f98a0eca30453a496">0001590364</dei:EntityCentralIndexKey>
    <dei:DocumentType
      contextRef="c20191031to20191031"
      id="Fact_dd040b22141846479020d5cb381e673e">8-K</dei:DocumentType>
    <dei:DocumentPeriodEndDate
      contextRef="c20191031to20191031"
      id="Fact_cf86e2df77444683adb826164dc58216">2019-10-31</dei:DocumentPeriodEndDate>
    <dei:EntityRegistrantName
      contextRef="c20191031to20191031"
      id="Fact_a1c9997b823142f486a6a4984788fa43">Fortress Transportation and Infrastructure Investors LLC</dei:EntityRegistrantName>
    <dei:EntityIncorporationStateCountryCode
      contextRef="c20191031to20191031"
      id="Fact_87cdcb6f79c0473f99e7d0519bbdf190">DE</dei:EntityIncorporationStateCountryCode>
    <dei:EntityFileNumber
      contextRef="c20191031to20191031"
      id="Fact_c62adb545d9b479cb0583d0a2f637ac5">001-37386</dei:EntityFileNumber>
    <dei:EntityTaxIdentificationNumber
      contextRef="c20191031to20191031"
      id="Fact_fc3352a9bf3c4772b5e4af1639c81c0f">32-0434238</dei:EntityTaxIdentificationNumber>
    <dei:EntityAddressAddressLine1
      contextRef="c20191031to20191031"
      id="Fact_8b29eccce47643ef9642538df80a4434">1345 Avenue of the Americas</dei:EntityAddressAddressLine1>
    <dei:EntityAddressAddressLine2
      contextRef="c20191031to20191031"
      id="Fact_71b92c9eee9e4444bf0822b2c9bf0ada">45th Floor</dei:EntityAddressAddressLine2>
    <dei:EntityAddressCityOrTown
      contextRef="c20191031to20191031"
      id="Fact_1c7fd739ecb74aff9c0bc634106f8f17">New York</dei:EntityAddressCityOrTown>
    <dei:EntityAddressStateOrProvince
      contextRef="c20191031to20191031"
      id="Fact_382379a7aab3442589f1494f1afeb5fa">NY</dei:EntityAddressStateOrProvince>
    <dei:EntityAddressPostalZipCode
      contextRef="c20191031to20191031"
      id="Fact_06e73168eed145cf8400ac365ed54f57">10105</dei:EntityAddressPostalZipCode>
    <dei:CityAreaCode
      contextRef="c20191031to20191031"
      id="Fact_791d17306f724f26be08bd47369ec278">212</dei:CityAreaCode>
    <dei:LocalPhoneNumber
      contextRef="c20191031to20191031"
      id="Fact_5d3db057a434460a92895a8596e1db6c">798-6100</dei:LocalPhoneNumber>
    <dei:WrittenCommunications
      contextRef="c20191031to20191031"
      id="Fact_6594b2957bd04a7d8c62b4ea134fd3c8">false</dei:WrittenCommunications>
    <dei:SolicitingMaterial
      contextRef="c20191031to20191031"
      id="Fact_37ec93a037f24f3589d92bdc2d83fcfd">false</dei:SolicitingMaterial>
    <dei:PreCommencementTenderOffer
      contextRef="c20191031to20191031"
      id="Fact_a60774d3c3a84cddb346e8d99950a3d7">false</dei:PreCommencementTenderOffer>
    <dei:PreCommencementIssuerTenderOffer
      contextRef="c20191031to20191031"
      id="Fact_2fc3c57c09af4cbeb565dd7d9cd052bc">false</dei:PreCommencementIssuerTenderOffer>
    <dei:EntityEmergingGrowthCompany
      contextRef="c20191031to20191031"
      id="Fact_e40f7b70cff24378b1508f175ad2474d">false</dei:EntityEmergingGrowthCompany>
    <dei:Security12bTitle
      contextRef="c20191031to20191031_StatementClassOfStockAxis_CommonClassAMember"
      id="Fact_2d237a0abc02407e94c8405010cbe73e">Class A Common shares, $0.01 par value per share</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="c20191031to20191031_StatementClassOfStockAxis_CommonClassAMember"
      id="Fact_171a512a5da840b885218334305395d9">FTAI</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="c20191031to20191031_StatementClassOfStockAxis_CommonClassAMember"
      id="Fact_71b35b189a8a4ad3aa780d134fdd04a6">NYSE</dei:SecurityExchangeName>
    <dei:Security12bTitle
      contextRef="c20191031to20191031_StatementClassOfStockAxis_Eight25FixedToFloatingRateSeriesACumulativePerpetualRedeemablePreferredSharesMember"
      id="Fact_7e45d6f6def547c38a866d463fc5637b">8.25% Fixed-to-Floating Rate Series A Cumulative Perpetual Redeemable Preferred Shares</dei:Security12bTitle>
    <dei:TradingSymbol
      contextRef="c20191031to20191031_StatementClassOfStockAxis_Eight25FixedToFloatingRateSeriesACumulativePerpetualRedeemablePreferredSharesMember"
      id="Fact_c24157baee094346be9c1bb87fbdd9e2">FTAI PR A</dei:TradingSymbol>
    <dei:SecurityExchangeName
      contextRef="c20191031to20191031_StatementClassOfStockAxis_Eight25FixedToFloatingRateSeriesACumulativePerpetualRedeemablePreferredSharesMember"
      id="Fact_b7ea0c7088e841f588a3fc1df7d285ae">NYSE</dei:SecurityExchangeName>
</xbrl>
