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Segment Information - Results of Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2014	Dec. 21, 2013
Segment Reporting Information [Line Items]
Gross revenues	$ 344,911us-gaap_Revenues	$ 311,086us-gaap_Revenues	$ 667,493us-gaap_Revenues	$ 537,992us-gaap_Revenues
Consolidated revenues	342,880us-gaap_SalesRevenueServicesNet	310,998us-gaap_SalesRevenueServicesNet	664,563us-gaap_SalesRevenueServicesNet	537,215us-gaap_SalesRevenueServicesNet
Gross profit	15,955us-gaap_GrossProfit	34,150us-gaap_GrossProfit	44,334us-gaap_GrossProfit	59,626us-gaap_GrossProfit
Operating income	(3,671)us-gaap_OperatingIncomeLoss	14,817us-gaap_OperatingIncomeLoss	4,876us-gaap_OperatingIncomeLoss	25,579us-gaap_OperatingIncomeLoss
Segment assets	566,082us-gaap_Assets		566,082us-gaap_Assets		568,932us-gaap_Assets
Goodwill	72,212us-gaap_Goodwill		72,212us-gaap_Goodwill		69,837us-gaap_Goodwill
Electrical Infrastructure [Member]
Segment Reporting Information [Line Items]
Gross revenues	58,533	37,180	114,206	70,057
Consolidated revenues	58,533	37,180	114,206	70,057
Gross profit	(16,058)	3,854	(16,547)	7,184
Operating income	(18,522)	860	(22,178)	2,160
Segment assets	113,071		113,071		120,264
Goodwill	42,886		42,886		43,243
Oil Gas & Chemical [Member]
Segment Reporting Information [Line Items]
Gross revenues	76,419	62,121	130,618	124,913
Consolidated revenues	75,457	62,111	128,816	124,606
Gross profit	7,352	6,686	11,738	14,217
Operating income	2,682	2,407	3,260	5,670
Segment assets	79,843		79,843		72,406
Goodwill	13,997		13,997		10,943
Storage Solutions [Member]
Segment Reporting Information [Line Items]
Gross revenues	129,987	180,655	263,337	289,201
Consolidated revenues	129,805	180,577	263,096	288,731
Gross profit	14,231	19,788	28,749	32,625
Operating income	6,627	10,760	13,730	16,592
Segment assets	200,391		200,391		200,493
Goodwill	9,824		9,824		10,027
Industrial [Member]
Segment Reporting Information [Line Items]
Gross revenues	79,972	31,130	159,332	53,821
Consolidated revenues	79,085	31,130	158,445	53,821
Gross profit	10,430	3,822	20,394	5,600
Operating income	5,542	790	10,064	1,157
Segment assets	99,084		99,084		105,049
Goodwill	5,505		5,505		5,624
Other Segments [Member]
Segment Reporting Information [Line Items]
Segment assets	73,693		73,693		70,720
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Gross revenues	2,031	88	2,930	777
Intersegment Eliminations [Member] \| Electrical Infrastructure [Member]
Segment Reporting Information [Line Items]
Gross revenues	0	0	0	0
Intersegment Eliminations [Member] \| Oil Gas & Chemical [Member]
Segment Reporting Information [Line Items]
Gross revenues	962	10	1,802	307
Intersegment Eliminations [Member] \| Storage Solutions [Member]
Segment Reporting Information [Line Items]
Gross revenues	182	78	241	470
Intersegment Eliminations [Member] \| Industrial [Member]
Segment Reporting Information [Line Items]
Gross revenues	887	0	887	0
Kvaerner NAC
Segment Reporting Information [Line Items]
Goodwill						$ 39,295