Organization and Nature of Operations	12 Months Ended
Dec. 31, 2020
Organization Consolidation And Presentation Of Financial Statements [Abstract]
ORGANIZATION AND NATURE OF OPERATIONS	NOTE 1 — ORGANIZATION AND NATURE OF OPERATIONS Alta Equipment Group, Inc. (formerly known as B. Riley Principal Merger Corp.) (individually or as sometimes collectively together with its direct and indirect subsidiaries referred to herein as the “Company”), was incorporated in Delaware on October 30, 2018 as a blank check company for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, recapitalization, reorganization or other similar business combination with one or more businesses or entities. On February 14, 2020, the Company consummated a reverse recapitalization pursuant to which the Company acquired Alta Equipment Holdings, Inc. pursuant to an agreement and plan of merger between the Company, BR Canyon Merger Sub Corp., a Delaware corporation and wholly-owned subsidiary of the Company (“Merger Sub”), Alta Equipment Holdings, Inc. and Ryan Greenawalt. This business merger will be referred to as “reverse recapitalization” throughout this document. In connection with the reverse recapitalization, Merger Sub merged with and into Alta Equipment Holdings, Inc., with Alta Equipment Holdings, Inc. surviving the reverse recapitalization as a direct, wholly owned subsidiary of the Company, and the Company changed its name from B. Riley Principal Merger Corp. to Alta Equipment Group Inc. The Company and Alta Equipment Holdings, Inc. are the holding companies for Alta Enterprises, LLC. Alta Enterprises, LLC is the holding company for Alta Industrial Equipment Michigan; LLC; Alta Industrial Equipment Company, LLC; Alta Industrial Equipment New York, LLC; PeakLogix, LLC; Alta Construction Equipment, LLC; Alta Construction Equipment Illinois, LLC; Alta Heavy Equipment Services, LLC; NITCO, LLC; Alta Construction Equipment Florida, LLC, and Alta Construction Equipment New York, LLC. The Company is engaged in the retail sale, service, and rental of lift trucks and construction equipment in the states of Michigan, Illinois, Indiana, Virginia and Florida as well as the Northeastern part of the United States. Unless the context otherwise requires, the use of the terms “the Company”, “we,” “us,” and “our” in these notes to the unaudited consolidated financial statements refers to Alta Equipment Group Inc. and its consolidated subsidiaries. COVID-19 The COVID-19 pandemic has created significant volatility in the global economy and resulted in significant disruptions to our business in the year ended December 31, 2020. The extent and duration of the COVID-19 impact on our operations and financial position, and on the domestic and global economy, remain uncertain. Prior to mid-March 2020, our performance was generally in accordance with our expectations. In mid-March 2020, the Company started to see a slowdown in its business activity, initially and primarily in the automotive industry and in the state of Michigan due to its customers being impacted by the COVID-19 pandemic. COVID-19 is discussed in more detail throughout “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”

Organization and Nature of Operations

12 Months Ended

Dec. 31, 2020

Organization Consolidation And Presentation Of Financial Statements [Abstract]

NOTE 1 — ORGANIZATION AND NATURE OF OPERATIONS

Alta Equipment Group, Inc. (formerly known as B. Riley Principal Merger Corp.) (individually or as sometimes collectively together with its direct and indirect subsidiaries referred to herein as the “Company”), was incorporated in Delaware on October 30, 2018 as a blank check company for the purpose of effecting a merger, share exchange, asset acquisition, share purchase, recapitalization, reorganization or other similar business combination with one or more businesses or entities. On February 14, 2020, the Company consummated a reverse recapitalization pursuant to which the Company acquired Alta Equipment Holdings, Inc. pursuant to an agreement and plan of merger between the Company, BR Canyon Merger Sub Corp., a Delaware corporation and wholly-owned subsidiary of the Company (“Merger Sub”), Alta Equipment Holdings, Inc. and Ryan Greenawalt. This business merger will be referred to as “reverse recapitalization” throughout this document.

In connection with the reverse recapitalization, Merger Sub merged with and into Alta Equipment Holdings, Inc., with Alta Equipment Holdings, Inc. surviving the reverse recapitalization as a direct, wholly owned subsidiary of the Company, and the Company changed its name from B. Riley Principal Merger Corp. to Alta Equipment Group Inc.

The Company and Alta Equipment Holdings, Inc. are the holding companies for Alta Enterprises, LLC. Alta Enterprises, LLC is the holding company for Alta Industrial Equipment Michigan; LLC; Alta Industrial Equipment Company, LLC; Alta Industrial Equipment New York, LLC; PeakLogix, LLC; Alta Construction Equipment, LLC; Alta Construction Equipment Illinois, LLC; Alta Heavy Equipment Services, LLC; NITCO, LLC; Alta Construction Equipment Florida, LLC, and Alta Construction Equipment New York, LLC.

The Company is engaged in the retail sale, service, and rental of lift trucks and construction equipment in the states of Michigan, Illinois, Indiana, Virginia and Florida as well as the Northeastern part of the United States.

Unless the context otherwise requires, the use of the terms “the Company”, “we,” “us,” and “our” in these notes to the unaudited consolidated financial statements refers to Alta Equipment Group Inc. and its consolidated subsidiaries.

COVID-19

The COVID-19 pandemic has created significant volatility in the global economy and resulted in significant disruptions to our business in the year ended December 31, 2020. The extent and duration of the COVID-19 impact on our operations and financial position, and on the domestic and global economy, remain uncertain.

Prior to mid-March 2020, our performance was generally in accordance with our expectations. In mid-March 2020, the Company started to see a slowdown in its business activity, initially and primarily in the automotive industry and in the state of Michigan due to its customers being impacted by the COVID-19 pandemic. COVID-19 is discussed in more detail throughout “Management’s Discussion and Analysis of Financial Condition and Results of Operations.”