Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues		$ 121,195	$ 129,453
Sales revenues		(15,439)	(15,436)
Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues		(14,611)	(14,366)
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	1,234	1,503
Sales revenues	[1]	(1,234)	(1,503)
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues		68,648	73,198
Sales revenues		(7,940)	(7,644)
Operating Segments [Member] | Enviroplex [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Revenues		2,090	2,778
Inter-segment Eliminations [Member] | Mobile Modular [Member]
Segment Reporting Information [Line Items]
Sales revenues		$ 856	$ 1,275
Type of Revenue [Extensible List]		Sales [Member]	Sales [Member]

[1] Gross Enviroplex sales revenues were $2,090 and $2,778 for the three months ended March 31, 2021 and 2020, respectively. There were $856 and $1,275 inter-segment sales to Mobile Modular in the three months ended March 31, 2021 and 2020, respectively, which required elimination in consolidation.