Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020		Jun. 30, 2019
Segment Reporting Information [Line Items]
Revenues		$ 137,673,000	$ 127,439,000	$ 267,126,000		$ 249,447,000
Sales revenues				(47,005,000)		(32,724,000)
Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues		(30,669,000)	(13,707,000)	(45,035,000)		(30,532,000)
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues		9,199,000	1,072,000	10,702,000	[1]	3,877,000	[1]
Sales revenues	[1]			(10,702,000)		(3,877,000)
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues		$ 76,762,000	$ 67,722,000	149,960,000		132,814,000
Sales revenues				(23,315,000)		(15,444,000)
Operating Segments [Member] | Enviroplex [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Revenues				11,979,000		3,877,000
Inter-segment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales revenues						$ 0
Type of Revenue [Extensible List]						us-gaap:ProductMember
Inter-segment Eliminations [Member] | Mobile Modular [Member]
Segment Reporting Information [Line Items]
Sales revenues				$ 1,277,000
Type of Revenue [Extensible List]				us-gaap:ProductMember

[1] Gross Enviroplex sales revenues were $11,979 and $3,877 for the six months ended June 30, 2020 and 2019, respectively. There were $1,277 inter-segment sales to Mobile Modular in the six months ended June 30, 2020, which required elimination in consolidation.  There were no inter-segment sales in the six months ended June 30, 2019.