General - Additional Information (Details) - USD ($) $ in Thousands				1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 18, 2016	Feb. 01, 2016	Mar. 01, 2015	Feb. 28, 2015	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
General [Line Items]
Sale of interest in Bayou Perma-Pipe Canada, Ltd., net of cash disposed					$ 4,599	$ 0
Schultz Mechanical Contractors, Inc.
General [Line Items]
Total consideration recorded			$ 7,700		7,662
Cash payments to acquire business			6,700
Purchase price			7,100
Working capital adjustment			(400)
Adjustment to account for deferred consideration			$ 1,000
Contingent consideration paid					500
Underground Solutions
General [Line Items]
Total consideration recorded					88,797
Cash payments to acquire business	$ 85,000
Discounted value of net operating loss tax assets	5,300
Consideration transferred, funds held in escrow	6,300
Foreign earnings repatriated	30,400
Foreign earnings repatriated, tax impact	$ 3,500
Working capital adjustment					$ (1,500)
Video Injection - Instituform SAS
General [Line Items]
Loss on disposition of business				$ 2,900
Bayou Perma-Pipe Canada, Ltd
General [Line Items]
Ownership interest		51.00%
Consideration received		$ 9,600
Proceeds from divestiture		7,600
Disposal, note receivable		$ 2,000
Expected loss from disposal, before tax							$ 600