Segment Information - Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Jun. 30, 2015
Segment Reporting Information [Line Items]
Gross revenues	$ 320,489	$ 322,582
Consolidated revenues	319,331	321,683
Gross profit	34,584	28,379
Operating income	15,101	8,547
Segment assets	536,571		$ 568,331
Goodwill	70,940		71,518
Electrical Infrastructure [Member]
Segment Reporting Information [Line Items]
Gross revenues	65,625	55,673
Consolidated revenues	65,625	55,673
Gross profit	4,708	(489)
Operating income	1,200	(3,656)
Segment assets	136,564		129,725
Goodwill	41,998		42,374
Oil Gas & Chemical [Member]
Segment Reporting Information [Line Items]
Gross revenues	68,959	54,199
Consolidated revenues	68,311	53,359
Gross profit	5,683	4,386
Operating income	1,416	578
Segment assets	101,988		108,960
Goodwill	14,008		14,008
Storage Solutions [Member]
Segment Reporting Information [Line Items]
Gross revenues	144,570	133,350
Consolidated revenues	144,236	133,291
Gross profit	20,232	14,518
Operating income	11,549	7,103
Segment assets	172,900		172,857
Goodwill	9,533		9,664
Industrial [Member]
Segment Reporting Information [Line Items]
Gross revenues	41,335	79,360
Consolidated revenues	41,159	79,360
Gross profit	3,961	9,964
Operating income	936	4,522
Segment assets	59,360		102,761
Goodwill	5,401		5,472
Other Segments [Member]
Segment Reporting Information [Line Items]
Segment assets	65,759		$ 54,028
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Gross revenues	1,158	899
Intersegment Eliminations [Member] \| Electrical Infrastructure [Member]
Segment Reporting Information [Line Items]
Gross revenues	0	0
Intersegment Eliminations [Member] \| Oil Gas & Chemical [Member]
Segment Reporting Information [Line Items]
Gross revenues	648	840
Intersegment Eliminations [Member] \| Storage Solutions [Member]
Segment Reporting Information [Line Items]
Gross revenues	334	59
Intersegment Eliminations [Member] \| Industrial [Member]
Segment Reporting Information [Line Items]
Gross revenues	$ 176	$ 0

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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