Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($)		3 Months Ended
		Mar. 31, 2025	Mar. 31, 2024
Segment Reporting Information [Line Items]
Revenues		$ 195,416,000	$ 187,827,000
Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues		38,926,000	35,069,000
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	7,213,000	1,719,000
Enviroplex [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues	[1]	7,213,000	1,719,000
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues		131,919,000	127,585,000
Mobile Modular [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues		22,490,000	25,326,000
Portable Storage [Member]
Segment Reporting Information [Line Items]
Revenues		21,265,000	24,760,000
Portable Storage [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues		1,244,000	1,212,000
TRS-RenTelco [Member]
Segment Reporting Information [Line Items]
Revenues		35,019,000	33,763,000
TRS-RenTelco [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues		7,979,000	6,812,000
Operating Segments [Member] | Enviroplex [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Revenues		7,213,000	1,719,000
Inter-segment Eliminations [Member] | Mobile Modular [Member]
Segment Reporting Information [Line Items]
Sales revenues		$ 0	$ 1,845,000

[1] Gross Enviroplex sales revenues were $7,213 and $1,719 for the three months ended March 31, 2025 and 2024, respectively. There were no inter-segment sales to Mobile Modular in the three months ended March 31, 2025 and $1,845 inter-segment sales to Mobile Modular for the same period in 2024, which required elimination in consolidation.