Segment Information - Results of Operations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			6 Months Ended				3 Months Ended			6 Months Ended				3 Months Ended			6 Months Ended				3 Months Ended			6 Months Ended				3 Months Ended			6 Months Ended								3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		0 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2013		Dec. 31, 2012	Jun. 30, 2013	Dec. 31, 2013 Electrical Infrastructure [Member]		Dec. 31, 2012 Electrical Infrastructure [Member]	Dec. 31, 2013 Electrical Infrastructure [Member]		Dec. 31, 2012 Electrical Infrastructure [Member]	Jun. 30, 2013 Electrical Infrastructure [Member]	Dec. 31, 2013 Oil Gas & Chemical [Member]		Dec. 31, 2012 Oil Gas & Chemical [Member]	Dec. 31, 2013 Oil Gas & Chemical [Member]		Dec. 31, 2012 Oil Gas & Chemical [Member]	Jun. 30, 2013 Oil Gas & Chemical [Member]	Dec. 31, 2013 Storage Solutions [Member]		Dec. 31, 2012 Storage Solutions [Member]	Dec. 31, 2013 Storage Solutions [Member]		Dec. 31, 2012 Storage Solutions [Member]	Jun. 30, 2013 Storage Solutions [Member]	Dec. 31, 2013 Industrial [Member]		Dec. 31, 2012 Industrial [Member]	Dec. 31, 2013 Industrial [Member]		Dec. 31, 2012 Industrial [Member]	Jun. 30, 2013 Industrial [Member]	Dec. 31, 2013 Other Segments [Member]		Jun. 30, 2013 Other Segments [Member]	Dec. 31, 2012 Other Segments [Member]	Dec. 31, 2013 Intersegment Eliminations [Member]	Dec. 31, 2012 Intersegment Eliminations [Member]	Dec. 31, 2013 Intersegment Eliminations [Member]	Dec. 31, 2012 Intersegment Eliminations [Member]	Dec. 31, 2013 Intersegment Eliminations [Member] Electrical Infrastructure [Member]	Dec. 31, 2012 Intersegment Eliminations [Member] Electrical Infrastructure [Member]	Dec. 31, 2013 Intersegment Eliminations [Member] Electrical Infrastructure [Member]	Dec. 31, 2012 Intersegment Eliminations [Member] Electrical Infrastructure [Member]	Dec. 31, 2013 Intersegment Eliminations [Member] Oil Gas & Chemical [Member]	Dec. 31, 2012 Intersegment Eliminations [Member] Oil Gas & Chemical [Member]	Dec. 31, 2013 Intersegment Eliminations [Member] Oil Gas & Chemical [Member]	Dec. 31, 2012 Intersegment Eliminations [Member] Oil Gas & Chemical [Member]	Dec. 31, 2013 Intersegment Eliminations [Member] Storage Solutions [Member]	Dec. 31, 2012 Intersegment Eliminations [Member] Storage Solutions [Member]	Dec. 31, 2013 Intersegment Eliminations [Member] Storage Solutions [Member]	Dec. 31, 2012 Intersegment Eliminations [Member] Storage Solutions [Member]	Dec. 31, 2013 Intersegment Eliminations [Member] Industrial [Member]	Dec. 31, 2012 Intersegment Eliminations [Member] Industrial [Member]	Dec. 31, 2013 Intersegment Eliminations [Member] Industrial [Member]	Dec. 31, 2012 Intersegment Eliminations [Member] Industrial [Member]	Dec. 31, 2013 Matrix NAC	Dec. 31, 2013 Matrix NAC Electrical Infrastructure [Member]		Dec. 31, 2013 Matrix NAC Oil Gas & Chemical [Member]		Dec. 31, 2013 Matrix NAC Industrial [Member]		Dec. 31, 2013 Matrix NAC Other Segments [Member]
Segment Reporting Information [Line Items]
Gross revenues	$ 311,086		$ 221,974	$ 537,992		$ 432,734		$ 37,180		$ 50,123	$ 70,057		$ 83,393		$ 62,121		$ 66,635	$ 124,913		$ 133,732		$ 180,655		$ 98,183	$ 289,201		$ 203,601		$ 31,130		$ 7,033	$ 53,821		$ 12,008						$ 88	$ 538	$ 777	$ 1,690	$ 0	$ 0	$ 0	$ 0	$ 10	$ 0	$ 307	$ 0	$ 78	$ 538	$ 470	$ 1,690	$ 0	$ 0	$ 0	$ 0
Consolidated revenues	310,998		221,436	537,215		431,044		37,180		50,123	70,057		83,393		62,111		66,635	124,606		133,732		180,577		97,645	288,731		201,911		31,130		7,033	53,821		12,008																										5,400
Gross profit	34,150		22,333	59,626		44,577		3,854		6,629	7,184		11,335		6,686		8,045	14,217		15,912		19,788		7,748	32,625		17,717		3,822		(89)	5,600		(387)
Operating income	14,817		8,772	25,579		16,696		860		3,696	2,160		6,015		2,407		3,927	5,670		7,702		10,760		1,550	16,592		4,999		790		(401)	1,157		(2,020)																										0
Segment assets	535,907	[1]	376,074	535,907	[1]	376,074	409,978	89,205	[1]	72,229	89,205	[1]	72,229		71,086	[1]	76,044	71,086	[1]	76,044		179,666	[1]	163,906	179,666	[1]	163,906		104,043	[1]	14,555	104,043	[1]	14,555		91,907	[1]		49,340																						38,600	[1]	3,300	[1]	69,600	[1]
Goodwill	$ 67,122			$ 67,122			$ 30,836	$ 12,013			$ 12,013			$ 12,013	$ 5,088			$ 5,088			$ 5,088	$ 10,038			$ 10,038			$ 10,063	$ 3,672			$ 3,672			$ 3,672	$ 36,311		$ 0																						$ 36,311							$ 36,300

[1] December 31, 2013 balances include the assets of Matrix NAC and are allocated to the Electrical Infrastructure, Oil Gas & Chemical, and Industrial segments in the amounts of $38.6 million, $3.3 million and $69.6 million, respectively. Unallocated assets includes $36.3 million of Goodwill related to the acquisition. As previously noted, we are currently assessing the impact of the acquisition on our reporting units and expect to have the Goodwill analysis complete in the third quarter of fiscal 2014.