General - Fair Value of Identified Assets and Liabilities (Details) $ in Thousands, € in Millions, £ in Millions	Mar. 01, 2017 GBP (£)	Mar. 01, 2017 USD ($)	Jun. 02, 2016 EUR (€)	Jun. 02, 2016 USD ($)	May 13, 2016 USD ($)	Feb. 18, 2016 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Goodwill							$ 304,357	$ 298,619
Environmental Techniques
Business Acquisition [Line Items]
Receivables and cost and estimated earnings in excess of billings		$ 801
Inventories		1,281
Prepaid expenses and other current assets		93
Property, plant and equipment		2,147
Identified intangible assets		1,869
Deferred income tax assets		124
Accounts payable		(1,025)
Accrued expenses		(186)
Deferred income tax liabilities		413
Total identifiable net assets		4,691
Total consideration recorded	£ 6.5	8,000
Less: total identifiable net assets		4,691
Goodwill		$ 3,355
Underground Solutions
Business Acquisition [Line Items]
Total consideration recorded						$ 88,400
Fyfe Europe
Business Acquisition [Line Items]
Total consideration recorded					$ 3,000
LMJ
Business Acquisition [Line Items]
Total consideration recorded			€ 2.9	$ 3,200