Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021		Jun. 30, 2020
Segment Reporting Information [Line Items]
Revenues		$ 146,435	$ 137,673	$ 267,630		$ 267,126
Sales revenues				(44,605)		(47,005)
Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues		(28,256)	(30,669)	(42,867)		(45,035)
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues		8,122	9,199	9,356	[1]	10,702	[1]
Sales revenues	[1]			(9,356)		(10,702)
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues		$ 84,572	$ 76,762	153,220		149,960
Sales revenues				(23,067)		(23,315)
Operating Segments [Member] | Enviroplex [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Revenues				10,211		11,979
Inter-segment Eliminations [Member] | Mobile Modular [Member]
Segment Reporting Information [Line Items]
Sales revenues				$ 855		$ 1,277
Type of Revenue [Extensible List]				Sales [Member]		Sales [Member]

[1] Gross Enviroplex sales revenues were 10,211 and $11,979 for the six months ended June 30, 2021 and 2020, respectively. There were $855 and $1,277 inter-segment sales to Mobile Modular in the six months ended June 30, 2021 and 2020, respectively, which required elimination in consolidation.