Condensed Consolidated Financial Information	3 Months Ended
Mar. 31, 2024
Accounting Policies [Abstract]
Condensed Consolidated Financial Information	NOTE 1. CONDENSED CONSOLIDATED FINANCIAL INFORMATION The condensed consolidated financial statements for the three months ended March 31, 2024 and 2023 have not been audited, but in the opinion of management, all adjustments (consisting of normal recurring accruals, consolidating and eliminating entries) necessary for the fair presentation of the consolidated financial position, results of operations and cash flows of McGrath RentCorp (the “Company”) have been made. The accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and note disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to those rules and regulations. The consolidated results for the three months ended March 31, 2024, should not be considered as necessarily indicative of the consolidated results for the entire fiscal year. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s latest Annual Report on Form 10-K, filed with the SEC on February 21, 2024 for the year ended December 31, 2023 (the “2023 Annual Report”). Agreement and Plan of Merger with WillScot Mobile Mini Holdings Corp. On January 28, 2024, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”), with WillScot Mobile Mini Holdings Corp., a Delaware corporation ("WillScot Mobile Mini”), Brunello Merger Sub I, Inc., a California corporation and a direct wholly owned subsidiary of WillScot Mobile Mini (“Merger Sub I”), and Brunello Merger Sub II, LLC, a Delaware limited liability company and direct wholly owned subsidiary of WillScot Mobile Mini (“Merger Sub II”). The Merger Agreement provides that, upon the terms and subject to the conditions set forth therein, Merger Sub I will merge with and into the Company (the “First-Step Merger”), with the Company surviving the First-Step Merger and, immediately thereafter, the Company will merge with and into Merger Sub II (the “Second-Step Merger” and together with the First-Step Merger, the “Transaction”), with Merger Sub II surviving the Second-Step Merger as a wholly owned subsidiary of WillScot Mobile Mini. Each of the parties to the Merger Agreement intends that the Transaction will be treated as a single integrated transaction that qualifies as a “reorganization” within the meaning of Section 368(a) of the U.S. Internal Revenue Code of 1986, as amended. Consummation of the Transaction is subject to the approval of the Company’s shareholders, the receipt of required regulatory approvals, and satisfaction or waiver of other customary closing conditions. The First-Step Merger and the Second-Step Merger will be consummated on the same day. On the terms and subject to the conditions set forth in the Merger Agreement, at the effective time of the First-Step Merger (the “Effective Time”), each share of common stock, no par value, of the Company (the “Company Common Stock”) issued and outstanding immediately prior to the Effective Time, other than shares of Company Common Stock owned by WillScot Mobile Mini or any subsidiary of WillScot Mobile Mini or the Company, and shares held by shareholders who did not vote in favor of the Transaction (or consent thereto in writing) and who are entitled to demand and properly demands appraisal of such shares, will be automatically converted into the right to receive either (1) $123 in cash (the “Per Share Cash Consideration”) or (2) 2.8211 (the “Exchange Ratio”) shares of validly issued, fully paid and nonassessable shares of common stock, par value $0.0001, of WillScot Mobile Mini (the “WillScot Mobile Mini Common Stock”) (the “Per Share Stock Consideration” together with the Per Share Cash Consideration, the “Merger Consideration”), as determined pursuant to the election and allocation procedures in the Merger Agreement. The Company’s shareholders will have the opportunity to elect to receive either the Per Share Cash Consideration or the Per Share Stock Consideration in respect of their Company Common Stock, provided that 60% of the Company Common Stock will be converted into the cash consideration and 40% of the Company Common Stock will be converted into the stock consideration. Pursuant to the terms of the Merger Agreement, the closing of the Merger Agreement is subject to the satisfaction of customary closing conditions, including adoption of the Merger Agreement by the Company’s shareholders and receipt of regulatory approvals. The closing of the Transaction is not subject to any financing condition.

Condensed Consolidated Financial Information

3 Months Ended

Mar. 31, 2024

Condensed Consolidated Financial Information

NOTE 1. CONDENSED CONSOLIDATED FINANCIAL INFORMATION

The condensed consolidated financial statements for the three months ended March 31, 2024 and 2023 have not been audited, but in the opinion of management, all adjustments (consisting of normal recurring accruals, consolidating and eliminating entries) necessary for the fair presentation of the consolidated financial position, results of operations and cash flows of McGrath RentCorp (the “Company”) have been made. The accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”). Certain information and note disclosures normally included in annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) have been condensed or omitted pursuant to those rules and regulations. The consolidated results for the three months ended March 31, 2024, should not be considered as necessarily indicative of the consolidated results for the entire fiscal year. These condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in the Company’s latest Annual Report on Form 10-K, filed with the SEC on February 21, 2024 for the year ended December 31, 2023 (the “2023 Annual Report”).

Agreement and Plan of Merger with WillScot Mobile Mini Holdings Corp.

On January 28, 2024, the Company entered into an Agreement and Plan of Merger (the “Merger Agreement”), with WillScot Mobile Mini Holdings Corp., a Delaware corporation ("WillScot Mobile Mini”), Brunello Merger Sub I, Inc., a California corporation and a direct wholly owned subsidiary of WillScot Mobile Mini (“Merger Sub I”), and Brunello Merger Sub II, LLC, a Delaware limited liability company and direct wholly owned subsidiary of WillScot Mobile Mini (“Merger Sub II”). The Merger Agreement provides that, upon the terms and subject to the conditions set forth therein, Merger Sub I will merge with and into the Company (the “First-Step Merger”), with the Company surviving the First-Step Merger and, immediately thereafter, the Company will merge with and into Merger Sub II (the “Second-Step Merger” and together with the First-Step Merger, the “Transaction”), with Merger Sub II surviving the Second-Step Merger as a wholly owned subsidiary of WillScot Mobile Mini. Each of the parties to the Merger Agreement intends that the Transaction will be treated as a single integrated transaction that qualifies as a “reorganization” within the meaning of Section 368(a) of the U.S. Internal Revenue Code of 1986, as amended. Consummation of the Transaction is subject to the approval of the Company’s shareholders, the receipt of required regulatory approvals, and satisfaction or waiver of other customary closing conditions. The First-Step Merger and the Second-Step Merger will be consummated on the same day.

On the terms and subject to the conditions set forth in the Merger Agreement, at the effective time of the First-Step Merger (the “Effective Time”), each share of common stock, no par value, of the Company (the “Company Common Stock”) issued and outstanding immediately prior to the Effective Time, other than shares of Company Common Stock owned by WillScot Mobile Mini or any subsidiary of WillScot Mobile Mini or the Company, and shares held by shareholders who did not vote in favor of the Transaction (or consent thereto in writing) and who are entitled to demand and properly demands appraisal of such shares, will be automatically converted into the right to receive either (1) $123 in cash (the “Per Share Cash Consideration”) or (2) 2.8211 (the “Exchange Ratio”) shares of validly issued, fully paid and nonassessable shares of common stock, par value $0.0001, of WillScot Mobile Mini (the “WillScot Mobile Mini Common Stock”) (the “Per Share Stock Consideration” together with the Per Share Cash Consideration, the “Merger Consideration”), as determined pursuant to the election and allocation procedures in the Merger Agreement. The Company’s shareholders will have the opportunity to elect to receive either the Per Share Cash Consideration or the Per Share Stock Consideration in respect of their Company Common Stock, provided that 60% of the Company Common Stock will be converted into the cash consideration and 40% of the Company Common Stock will be converted into the stock consideration. Pursuant to the terms of the Merger Agreement, the closing of the Merger Agreement is subject to the satisfaction of customary closing conditions, including adoption of the Merger Agreement by the Company’s shareholders and receipt of regulatory approvals. The closing of the Transaction is not subject to any financing condition.