Segment Reporting (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Segment	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting (Textual) [Abstract]
Revenues from customers	10.00%	10.00%	10.00%
Segment Reporting (Additional Textual) [Abstract]
Number of reportable segments	4
Enviroplex [Member]
Segment Reporting (Textual) [Abstract]
Sales revenues	24,240	20,884	12,321
Mobile Modular [Member]
Segment Reporting (Textual) [Abstract]
Sales revenues	417	97	626
Foreign country customers [Member]
Segment Reporting (Textual) [Abstract]
Revenues from customers	9.00%	8.00%	9.00%