Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Segment Reporting Information [Line Items]
Revenues		$ 121,993	$ 113,048	$ 318,797	$ 299,262
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues	[1]			15,787	8,366
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues				158,452	134,117
Operating Segments [Member] | Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues				15,872	9,077
Inter-segment Eliminations [Member] | Mobile Modular [Member]
Segment Reporting Information [Line Items]
Sales revenues				$ 85	$ 711

[1] Gross Enviroplex sales revenues were $15,872 and $9,077 for the nine months ended September 30, 2016 and 2015, respectively, which include inter-segment sales to Mobile Modular of $85 and $711, respectively, which have been eliminated in consolidation.