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Segment Information - Results of Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended			3 Months Ended					3 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2014	Sep. 30, 2014 Electrical Infrastructure [Member]	Sep. 30, 2013 Electrical Infrastructure [Member]	Jun. 30, 2014 Electrical Infrastructure [Member]	Sep. 30, 2014 Oil Gas & Chemical [Member]	Sep. 30, 2013 Oil Gas & Chemical [Member]	Jun. 30, 2014 Oil Gas & Chemical [Member]	Sep. 30, 2014 Storage Solutions [Member]	Sep. 30, 2013 Storage Solutions [Member]	Jun. 30, 2014 Storage Solutions [Member]	Sep. 30, 2014 Industrial [Member]	Sep. 30, 2013 Industrial [Member]	Jun. 30, 2014 Industrial [Member]	Sep. 30, 2014 Other Segments [Member]	Jun. 30, 2014 Other Segments [Member]	Sep. 30, 2014 Intersegment Eliminations [Member]	Sep. 30, 2013 Intersegment Eliminations [Member]	Sep. 30, 2014 Intersegment Eliminations [Member] Electrical Infrastructure [Member]	Sep. 30, 2013 Intersegment Eliminations [Member] Electrical Infrastructure [Member]	Sep. 30, 2014 Intersegment Eliminations [Member] Oil Gas & Chemical [Member]	Sep. 30, 2013 Intersegment Eliminations [Member] Oil Gas & Chemical [Member]	Sep. 30, 2014 Intersegment Eliminations [Member] Storage Solutions [Member]	Sep. 30, 2013 Intersegment Eliminations [Member] Storage Solutions [Member]	Sep. 30, 2014 Intersegment Eliminations [Member] Industrial [Member]	Sep. 30, 2013 Intersegment Eliminations [Member] Industrial [Member]	Dec. 21, 2013 Kvaerner NAC
Segment Reporting Information [Line Items]
Gross revenues	$ 322,582	$ 226,906		$ 55,673	$ 32,877		$ 54,199	$ 62,792		$ 133,350	$ 108,546		$ 79,360	$ 22,691				$ 899	$ 689	$ 0	$ 0	$ 840	$ 297	$ 59	$ 392	$ 0	$ 0
Consolidated revenues	321,683	226,217		55,673	32,877		53,359	62,495		133,291	108,154		79,360	22,691
Gross profit	28,379	25,476		(489)	3,330		4,386	7,531		14,518	12,837		9,964	1,778
Operating income	8,547	10,762		(3,656)	1,300		578	3,263		7,103	5,832		4,522	367
Segment assets	548,314		568,932	116,255		120,264	81,071		72,406	179,996		200,493	100,734		105,049	70,258	70,720
Goodwill	$ 72,065		$ 69,837	$ 43,062		$ 43,243	$ 13,529		$ 10,943	$ 9,910		$ 10,027	$ 5,564		$ 5,624													$ 39,232

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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