Description of Business - Additional Information (Details) $ in Thousands, € in Millions, £ in Millions, SFr in Millions					1 Months Ended					3 Months Ended									12 Months Ended			24 Months Ended
	Mar. 01, 2015 USD ($)	Mar. 31, 2014 USD ($)	Jul. 02, 2013 USD ($)	Jul. 01, 2013 USD ($)	Feb. 28, 2015 USD ($)	Dec. 31, 2014 CHF (SFr)	Dec. 31, 2014 USD ($)	Jun. 30, 2013 EUR (€)	Jun. 30, 2013 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Sep. 30, 2013 EUR (€)	Sep. 30, 2013 USD ($)	Jun. 30, 2013 USD ($)	Dec. 31, 2015 USD ($) country continent	Dec. 31, 2014 USD ($) plant	Dec. 31, 2013 USD ($)	Jun. 30, 2015 GBP (£)	Jun. 30, 2015 USD ($)	Feb. 01, 2016	Feb. 28, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of Countries in which Entity Operates | country																			80
Number of Continents on Which the Company Operates | continent																			6
Number of Years in Which the Company has Operated																			40 years
Business Acquisition [Line Items]
Proceeds from Divestiture of Businesses																			$ 0	$ 1,123	$ 0
Total consideration recorded																€ 14	$ 18,300
Gain (loss) on disposition of business																	11,300
Transaction expenses																	$ 500
Long-term Purchase Commitment, Amount																						£ 2.3	$ 3,600
Payments to Acquire Businesses, Gross																			150,000
Proceeds from sale of interests in German joint venture																			0	0	18,300
Gross equity in earnings of affiliate companies																			0	570	5,159
Proceeds from Equity Method Investment, Dividends or Distributions																			0	590	10,691
Loss on sale of interests in Bayou Coating, L.L.C.																				(500)
Payments to Noncontrolling Interests																			472	617	287
Tangible Asset Impairment Charges													$ 11,900
Additions to goodwill through acquisitions																			3,998
Goodwill							$ 293,023					$ 293,023							249,120	293,023
Schultz
Business Acquisition [Line Items]
Total consideration recorded	$ 7,662
Payments to Acquire Businesses, Gross	6,700										$ 7,100
Business Combination, Working Capital Adjustment	400
Business Combination, Consideration Transferred, Liabilities Incurred	1,000
Additions to goodwill through acquisitions										$ 400	$ 3,600
Goodwill	$ 3,998
Brinderson LP
Business Acquisition [Line Items]
Total consideration recorded			$ 146,605
Payments to Acquire Businesses, Gross				$ 150,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net				147,600															146,600
Payments for (Proceeds from) Previous Acquisition												(5,500)
Change in goodwill related to acquisitions												1,000							(1,000)
Goodwill				$ 76,248			76,248					76,248								76,248	77,248
Fyfe Asia
Business Acquisition [Line Items]
Change in goodwill related to acquisitions																				(1,098)
Goodwill							21,106					21,106								21,106	20,008
Video Injection - Instituform SAS
Business Acquisition [Line Items]
Gain (loss) on disposition of business					$ (2,900)
Ka-te
Business Acquisition [Line Items]
Proceeds from Divestiture of Businesses						SFr 1.1	1,100
Gain (loss) on disposition of business							$ (500)
Bayou Coating
Business Acquisition [Line Items]
Ownership interest		49.00%													49.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners		51.00%													51.00%
Proceeds from sale of interests in German joint venture		$ 9,100
Non-cash charge related to goodwill, pre-tax																		$ 2,700
Non-cash charge related to goodwill, post-tax																		1,800
Gross equity in earnings of affiliate companies															$ 1,200
Proceeds from Equity Method Investment, Dividends or Distributions															$ 700
Delta Double Jointing
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent																									59.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners																									41.00%
Payments to Noncontrolling Interests		$ 600
Bayou Welding Works
Business Acquisition [Line Items]
Goodwill and Intangible Asset Impairment																		3,900
Goodwill and Intangible Asset Impairment, Net of Tax																		2,400
Tangible Asset Impairment Charges																		1,100
Tangible Asset Impairment Charges, Net of Tax																		700
Closure charges of welding business																		$ 100	0	0	(5,019)
General and administrative expense												1,400								1,400
Operating loss																			$ 0	$ (6,008)	$ (11,247)
Operating expenses | Brinderson LP
Business Acquisition [Line Items]
Change in goodwill related to acquisitions												$ (4,500)
Pre-Acquisition Related Contingencies | Brinderson LP
Business Acquisition [Line Items]
Additions to goodwill through acquisitions														$ 14,500
Restructuring Plan 2014
Business Acquisition [Line Items]
Number of plant closures | plant																				2
Minimum | Restructuring Plan 2014
Business Acquisition [Line Items]
Period of capital investments in the remaining coating facilities																				2 years
Maximum | Restructuring Plan 2014
Business Acquisition [Line Items]
Period of capital investments in the remaining coating facilities																				3 years
Insituform Germany
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent									50.00%								50.00%	50.00%
Total consideration recorded								€ 14	$ 18,300
Gain (loss) on disposition of business									11,300
Transaction expenses									$ 500									$ 500
Long-term Purchase Commitment, Amount																						£ 2.3	$ 3,600
Subsequent Event | Bayou Perma-Pipe Canada, Ltd | Disposed of by Sale
Business Acquisition [Line Items]
Ownership percentage																								51.00%