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Segment Information - Results of Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Jun. 30, 2014	Dec. 21, 2013
Segment Reporting Information [Line Items]
Gross revenues	$ 318,321us-gaap_Revenues	$ 381,962us-gaap_Revenues	$ 985,814us-gaap_Revenues	$ 919,954us-gaap_Revenues
Consolidated revenues	314,155us-gaap_SalesRevenueServicesNet	381,516us-gaap_SalesRevenueServicesNet	978,718us-gaap_SalesRevenueServicesNet	918,731us-gaap_SalesRevenueServicesNet
Gross profit	2,632us-gaap_GrossProfit	39,944us-gaap_GrossProfit	46,966us-gaap_GrossProfit	99,570us-gaap_GrossProfit
Operating income	(14,448)us-gaap_OperatingIncomeLoss	18,819us-gaap_OperatingIncomeLoss	(9,572)us-gaap_OperatingIncomeLoss	44,398us-gaap_OperatingIncomeLoss
Segment assets	579,006us-gaap_Assets		579,006us-gaap_Assets		568,932us-gaap_Assets
Goodwill	71,377us-gaap_Goodwill		71,377us-gaap_Goodwill		69,837us-gaap_Goodwill
Electrical Infrastructure [Member]
Segment Reporting Information [Line Items]
Gross revenues	48,228	62,144	162,434	132,201
Consolidated revenues	48,228	62,144	162,434	132,201
Gross profit	(22,429)	5,971	(38,976)	13,155
Operating income	(24,306)	2,498	(46,484)	4,658
Segment assets	112,685		112,685		120,264
Goodwill	42,346		42,346		43,243
Oil Gas & Chemical [Member]
Segment Reporting Information [Line Items]
Gross revenues	97,612	63,112	228,230	188,025
Consolidated revenues	95,758	62,994	224,574	187,600
Gross profit	7,261	7,397	18,999	21,614
Operating income	2,563	3,252	5,823	8,922
Segment assets	106,346		106,346		72,406
Goodwill	13,997		13,997		10,943
Storage Solutions [Member]
Segment Reporting Information [Line Items]
Gross revenues	107,640	182,129	370,977	471,330
Consolidated revenues	107,163	181,801	370,259	470,532
Gross profit	11,247	19,269	39,996	51,894
Operating income	5,055	10,084	18,785	26,676
Segment assets	156,367		156,367		200,493
Goodwill	9,632		9,632		10,027
Industrial [Member]
Segment Reporting Information [Line Items]
Gross revenues	64,841	74,577	224,173	128,398
Consolidated revenues	63,006	74,577	221,451	128,398
Gross profit	6,553	7,307	26,947	12,907
Operating income	2,240	2,985	12,304	4,142
Segment assets	109,056		109,056		105,049
Goodwill	5,402		5,402		5,624
Other Segments [Member]
Segment Reporting Information [Line Items]
Segment assets	94,552		94,552		70,720
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Gross revenues	4,166	446	7,096	1,223
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	1,854	118	3,656	425
Intersegment Eliminations [Member] \| Storage Solutions [Member]
Segment Reporting Information [Line Items]
Gross revenues	477	328	718	798
Intersegment Eliminations [Member] \| Industrial [Member]
Segment Reporting Information [Line Items]
Gross revenues	1,835	0	2,722	0
Kvaerner NAC
Segment Reporting Information [Line Items]
Goodwill						$ 39,295