0001452857 2020-11-03 2020-11-03 0001452857 us-gaap:CommonStockMember 2020-11-03 2020-11-03 0001452857 splp:SeriesAPreferredUnitsMember 2020-11-03 2020-11-03 0001452857 false 8-K 2020-11-03 STEEL PARTNERS HOLDINGS L.P. DE 001-35493 13-3727655 590 Madison Avenue, 32nd Floor New York NY 10022 212 520-2300 false false false false Common Units, $0 par SPLP NYSE 6.0% Series A Preferred Units SPLP-PRA NYSE false 2020-11-03