Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019		Jun. 30, 2018
Segment Reporting Information [Line Items]
Revenues		$ 127,439,000	$ 116,983,000	$ 249,447,000		$ 222,068,000
Sales revenues				(32,724,000)		(33,623,000)
Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues		(13,707,000)	(19,546,000)	(30,532,000)		(31,637,000)
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues		1,072,000	3,711,000	3,877,000	[1]	5,729,000	[1]
Sales revenues	[1]			(3,877,000)		(5,729,000)
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues		$ 67,722,000	$ 59,871,000	132,814,000		113,722,000
Sales revenues				(15,444,000)		(14,169,000)
Operating Segments [Member] | Enviroplex [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Revenues				3,877,000		6,524,000
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						$ 795,000
Type of Revenue [Extensible List]						us-gaap:ProductMember

[1] Gross Enviroplex sales revenues were $3,877 and $6,524 for the six months ended June 30, 2019 and 2018, respectively. There were $795 inter-segment sales to Mobile Modular in the six months ended June 30, 2018, which required elimination in consolidation.  There were no inter-segment sales in the six months ended June 30, 2019.