Business Segment Information - Schedule of Segment Assets (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Segment Reporting Information [Line Items]
Total Assets	$ 360,829	$ 327,947	$ 372,479
KSW [Member]
Segment Reporting Information [Line Items]
Total Assets	193,148	192,270	165,350
EWP [Member]
Segment Reporting Information [Line Items]
Total Assets	31,536	28,069	23,757
Calumet [Member]
Segment Reporting Information [Line Items]
Total Assets	15,904	18,865	14,820
Corporate [Member]
Segment Reporting Information [Line Items]
Total Assets	$ 120,241	$ 88,743	$ 168,552