Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended
	Sep. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Jun. 30, 2024	Sep. 30, 2024		Sep. 30, 2023
Segment Reporting Information [Line Items]
Revenues	$ 266,758		$ 243,506		$ 667,196		$ 610,254
Cash proceeds received attributed to terminate WillScot Mobile Mini Merger Agreement	180,000				180,000	[1]
Transaction costs	39,436				61,157	[2]
Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues	$ 92,508		$ 77,115		181,992		148,576
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Transaction costs		$ 6,500		$ 15,500
Portable Storage [Member]
Segment Reporting Information [Line Items]
Transaction costs		1,200		2,600
TRS-RenTelco [Member]
Segment Reporting Information [Line Items]
Transaction costs		$ 1,700		$ 3,600
Operating Segments [Member] | Enviroplex [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Revenues					30,593		16,401
Inter-segment Eliminations [Member] | Mobile Modular [Member]
Segment Reporting Information [Line Items]
Sales revenues					$ 2		$ 218

[1] During the period ended September 30, 2024, the Company received $180 million in cash proceeds attributed to the mutual decision to terminate the Merger Agreement. These proceeds are reported as non-operating income on the Company's Condensed Consolidated Statements of Income and are reported in the Company's Corporate segment.

[2] During the period ended September 30, 2024, the Company determined that transaction costs incurred by the Company attributed to the terminated Merger Agreement were significant. Due to this determination, the Company has separately reported these transaction costs in the Company's Corporate segment and excluded such costs from Selling and administrative expenses. The total transaction costs excluded from Selling and administrative expenses for the six months ended June 30, 2024, and the three months ended March 31, 2024, for Mobile Modular, Portable Storage and TRS-RenTelco was $15.5 million, $2.6 million and $3.6 million, respectively, and $6.5 million, $1.2 million and $1.7 million, respectively.