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Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($)		3 Months Ended								12 Months Ended
		Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Segment Reporting Information [Line Items]
Revenues		$ 133,115,000	$ 143,147,000	$ 116,983,000	$ 105,085,000	$ 122,227,000	$ 135,388,000	$ 109,582,000	$ 94,837,000	$ 498,330,000	$ 462,034,000	$ 424,080,000
Sales revenues										(96,649,000)	(94,549,000)	(76,833,000)
Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues										(92,618,000)	(91,500,000)	(74,410,000)
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues	[1]									29,046,000	31,369,000	22,121,000
Sales revenues	[1]									(29,046,000)	(31,369,000)	(22,121,000)
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues										254,574,000	231,266,000	209,512,000
Sales revenues										(40,742,000)	(38,234,000)	(29,810,000)
Operating Segments [Member] | Enviroplex [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Revenues										30,407,000	31,369,000	22,206,000
Inter-segment Eliminations [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues											$ 0
Inter-segment Eliminations [Member] | Mobile Modular [Member] | Sales [Member]
Segment Reporting Information [Line Items]
Sales revenues										$ 1,361,000		$ 85,000
[1] Gross Enviroplex sales revenues were $30,407, $31,369 and $22,206 in 2018, 2017 and 2016, respectively. There were $1,361 and $85 inter-segment sales to Mobile Modular in 2018 and 2016, respectively, which have been eliminated in consolidation. There were no inter-segment sales in 2017.

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