Acquisition and Disposition (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
	Oct. 06, 2015	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Mar. 20, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Income (Loss)		$ (6,460)		$ 1,203	$ (10,281)	$ 2,343
Loss on disposition		0		0	0	310
Proceeds from disposition					120	360
Subsidiaries
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Ownership percentage							67.00%
CDI-Pycopsa Ingenieria y Construccion
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from disposition					100
EdgeRock Technologies, LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to acquire businesses	$ 33,400
Contingent consideration arrangements, range of outcomes, high	$ 4,000
Specialty Talent and Technology [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Income (Loss)				444		1,169
Specialty Talent and Technology [Member] | Mexico-based Engineering Design Company [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Income (Loss)			$ 800
Specialty Talent and Technology [Member] | EdgeRock Technologies, LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Income (Loss)		(436)			9
Engineering Solutions [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Operating Income (Loss)		$ (2,943)		$ 907	$ (4,878)	$ 510