Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Segment Reporting Information [Line Items]
Revenues		$ 96,026	$ 95,745	$ 186,214	$ 183,305
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues	[1]			2,201	2,247
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues				81,004	70,955
Operating Segments [Member] | Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues				2,208	3,323
Inter-segment Eliminations [Member] | Mobile Modular [Member]
Segment Reporting Information [Line Items]
Sales revenues				$ 7	$ 1,076

[1] Gross Enviroplex sales revenues were $2,208 and $3,323 for the six months ended June 30, 2015 and 2014, respectively, which includes inter-segment sales to Mobile Modular of $7 and $1,076, respectively, which have been eliminated in consolidation.