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Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Revenues $ 256,443 $ 266,758 $ 687,475 $ 667,196
Cash proceeds received attributed to terminate WillScot Mobile Mini Merger Agreement 0 180,000 0 180,000
WillScot Mobile Mini transaction costs (Note 1) 0 39,436 0 61,157
Sales [Member]        
Segment Reporting Information [Line Items]        
Sales revenues 76,058 92,508 184,759 181,992
Enviroplex [Member]        
Segment Reporting Information [Line Items]        
Revenues 13,684 17,499 40,763 30,591
Mobile Modular [Member]        
Segment Reporting Information [Line Items]        
Revenues $ 181,468 $ 191,407 469,374 463,536
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Revenues     687,475 667,195
Operating Segments [Member] | Sales [Member]        
Segment Reporting Information [Line Items]        
Sales revenues     184,759 181,992
Operating Segments [Member] | Enviroplex [Member]        
Segment Reporting Information [Line Items]        
Revenues [1]     40,763 30,591
Operating Segments [Member] | Enviroplex [Member] | Sales [Member]        
Segment Reporting Information [Line Items]        
Revenues     40,762 30,593
Sales revenues [1]     40,763 30,591
Operating Segments [Member] | Mobile Modular [Member]        
Segment Reporting Information [Line Items]        
Revenues     469,374 463,536
Operating Segments [Member] | Mobile Modular [Member] | Sales [Member]        
Segment Reporting Information [Line Items]        
Sales revenues     115,308 127,251
Inter-segment Eliminations [Member] | Mobile Modular [Member]        
Segment Reporting Information [Line Items]        
Sales revenues     $ 0 $ 2
[1] Gross Enviroplex sales revenues were $40,762 and $30,593 for the nine months ended September 30, 2025 and 2024, respectively. There were no inter-segment sales to Mobile Modular in the nine months ended September 30, 2025 and $2 of inter-segment sales to Mobile Modular in the nine months ended September 30, 2024, which required elimination in consolidation.