Segment Reporting - Summarized Financial Information for Company's Reportable Segments (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Revenues	$ 113,025	$ 108,839	$ 296,330	$ 284,737
Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues			10,601	15,926
Mobile Modular [Member]
Segment Reporting Information [Line Items]
Revenues			117,194	98,182
Operating Segments [Member] | Enviroplex [Member]
Segment Reporting Information [Line Items]
Revenues			12,133	15,930
Inter-segment Eliminations [Member] | Mobile Modular [Member]
Segment Reporting Information [Line Items]
Sales revenues			$ 1,532	$ 4