Description of Business - Contributions to Revenues and Profits Since Acquisitions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Restructuring and related charges	$ 6,894	$ 12,814	$ 9,168
Goodwill impairment	1,389	45,390	0
Underground Solutions
Business Acquisition [Line Items]
Revenues	45,738	32,063	29,425
Net income (loss)	790	3,778	2,694
Inventory step up expense			3,600
Underground Solutions | Corporate, Non-Segment
Business Acquisition [Line Items]
Net income (loss)	5,000	4,500
Restructuring and related charges			3,200
Other acquisitions
Business Acquisition [Line Items]
Revenues	17,315	14,845	7,588
Net income (loss)	555	5,225	$ 1,811
Other acquisitions | Fyfe
Business Acquisition [Line Items]
Goodwill impairment		2,200
Other acquisitions | Corporate, Non-Segment
Business Acquisition [Line Items]
Restructuring and related charges	$ 4,800	$ 100