McGrath RentCorp is a rental company. It is comprised of four reportable business segments namely Modular building segment (Mobile Modular); Portable storage container segment (Portable Storage); Electronic test equipment segment (TRS-RenTelco); and its classroom manufacturing business selling modular buildings used primarily as classrooms in California (Enviroplex). The company generates its revenues majorily from the rental of its equipment on operating leases with sales of equipment occurring in the normal course of business.