Acquisitions - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended				12 Months Ended
	Oct. 08, 2015	Oct. 06, 2015	Dec. 31, 2015	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Mar. 20, 2015
Business Acquisition [Line Items]
Current Fiscal Year End Date							--12-31
Gain (Loss) on Disposition of Business			$ 0	$ 0	$ 0	$ (310)	$ (310)	$ 0	$ 0
Proceeds from disposition							430	$ 0	$ 0
EdgeRock Technologies, LLC [Member]
Business Acquisition [Line Items]
Cash consideration paid to acquire business		$ 33,400
Additional cash consideration contingent of Acquiree performance		4,000
Revenue included in consolidated statement of operations							10,200
Net loss before tax included in consolidated statement of operations							1,200
Contingent consideration		$ 833
Ship Shape Resources [Member]
Business Acquisition [Line Items]
Cash consideration paid to acquire business	$ 900
Finite-Lived Intangible Asset, Useful Life	4 years 6 months
Contingent consideration	$ 300
Intangible asset recorded	$ 1,200
Trademarks [Member] | EdgeRock Technologies, LLC [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		10 years
Intangible asset recorded		$ 1,340
Customer Relationships [Member] | EdgeRock Technologies, LLC [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		5 years
Intangible asset recorded		$ 6,220
Backlog [Member] | EdgeRock Technologies, LLC [Member]
Business Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life		1 year
Intangible asset recorded		$ 2,670
CDI-Pycopsa Ingenieria y Construccion [Member]
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent										67.00%
Gain (Loss) on Disposition of Business							(310)
Proceeds from disposition							$ 430