Segment and Geographic Information - Financial Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 330,713	$ 356,595	$ 337,096	$ 309,166	$ 352,181	$ 350,138	$ 322,868	$ 306,234	$ 1,333,570	$ 1,331,421	$ 1,091,420
Operating income (loss)	(28,640)	24,938	14,523	9,125	(35,631)	(13,934)	$ 20,619	$ 9,134	19,946	(19,812)	66,882
Total assets	1,258,307				1,295,673				1,258,307	1,295,673	1,377,418
Capital expenditures									29,454	32,899	26,085
Depreciation and amortization									43,791	44,312	40,329
Goodwill impairment	43,500								43,484	51,512	0
Definite-lived intangible asset impairment									0	12,116	0
Restructuring charges	300	$ 1,500	$ 5,700	$ 3,500	9,500	$ 40,000			968	687	0
Acquisition-related expenses									1,912	1,375	5,831
Held-for-sale Assets
Segment Reporting Information [Line Items]
Total assets	21,060				0				21,060	0	0
Discontinued Operations
Segment Reporting Information [Line Items]
Total assets	0				0				0	0	8,356
Infrastructure Solutions
Segment Reporting Information [Line Items]
Goodwill impairment									0
Corrosion Protection
Segment Reporting Information [Line Items]
Goodwill impairment	10,000								9,957
Energy Services
Segment Reporting Information [Line Items]
Goodwill impairment	33,500								33,527
Operating Segments
Segment Reporting Information [Line Items]
Revenues									1,333,570	1,331,421
Operating Segments | Infrastructure Solutions
Segment Reporting Information [Line Items]
Revenues									556,234	567,205	529,301
Operating income (loss)									46,867	(6,194)	28,487
Total assets	508,817				485,785				508,817	485,785	514,778
Capital expenditures									7,657	13,096	8,828
Depreciation and amortization									14,836	15,726	16,552
Operating Segments | Corrosion Protection
Segment Reporting Information [Line Items]
Revenues									437,921	458,409	453,886
Operating income (loss)									(1,771)	(31,010)	37,253
Total assets	489,519				506,659				489,519	506,659	547,280
Capital expenditures									17,226	12,107	14,399
Depreciation and amortization									18,834	19,259	18,736
Operating Segments | Energy Services
Segment Reporting Information [Line Items]
Revenues									339,415	305,807	108,233
Operating income (loss)									(25,150)	17,392	1,142
Total assets	183,763				197,858				183,763	197,858	190,688
Capital expenditures									2,202	3,720	968
Depreciation and amortization									7,641	7,004	3,218
Corporate, Non-Segment
Segment Reporting Information [Line Items]
Total assets	$ 55,148				$ 105,371				55,148	105,371	116,316
Capital expenditures									2,369	3,976	1,890
Depreciation and amortization									$ 2,480	$ 2,323	$ 1,823