Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($)		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting Information [Line Items]
Revenues		$ 733,823,000	$ 616,833,000	$ 572,554,000
Sales revenues		(155,177,000)	(128,759,000)	(128,371,000)
Transaction costs attributed to acquisition, divestiture and integration		4,300,000	2,000,000.0	0
Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues		(150,653,000)	(125,235,000)	(124,604,000)
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	23,170,000	31,081,000	32,737,000
Sales revenues	[1]	(23,170,000)	(31,081,000)	(32,737,000)
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues		461,717,000	363,316,000	321,524,000
Sales revenues		(101,578,000)	(70,417,000)	(65,278,000)
Operating Segments [Member] | Enviroplex [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Revenues		24,162,000	32,095,000	$ 34,014,000
Inter-segment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales revenues					$ 0
Inter-segment Eliminations [Member] | Mobile Modular [Member]
Segment Reporting Information [Line Items]
Sales revenues		$ 992,000	$ 1,014,000

[1] Gross Enviroplex sales revenues were $24,162, $32,095 and $34,014 in 2022, 2021 and 2020, respectively. There were $992 and $1,014 inter-segment sales to Mobile Modular in 2022 and 2021, which have been eliminated in consolidation. There were no inter-segment sales in 2019.