Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($)		3 Months Ended
		Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Information [Line Items]
Revenues		$ 129,453,000	$ 122,008,000
Sales revenues		(15,436,000)	(17,857,000)
Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues		(14,366,000)	(16,825,000)
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues	[1]	1,503,000	2,805,000
Sales revenues	[1]	(1,503,000)	(2,805,000)
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues		73,198,000	65,092,000
Sales revenues		(7,644,000)	(8,360,000)
Operating Segments [Member] | Enviroplex [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Revenues		2,778,000	2,805,000
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		$ 1,275,000
Type of Revenue [Extensible List]		us-gaap:ProductMember

[1] Gross Enviroplex sales revenues were $2,778 and $2,805 for the three months ended March 31, 2020 and 2019, respectively. There were $1,275 inter-segment sales to Mobile Modular in the three months ended March 31, 2020, which required elimination in consolidation.  There were no inter-segment sales in the three months ended March 31, 2019.