Supplemental Financial Information (Schedule Of Consolidating Statements Of Operations) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Schedule Of Supplemental Financial Information [Line Items]
Net sales	$ 191,032	$ 196,801
Cost of sales	161,168	160,624
Gross profit	29,864	36,177
Selling, general, and administrative expense	29,531	30,981
(Loss) income from operations	333	5,196
Interest expense (income)	3,640	11,160
Other expense (income)	30	(66)
(Loss) income before taxes	(3,337)	(5,898)
(Benefit of) provision for income taxes	(1,251)	(2,255)
(Loss) income from continuing operations	(2,086)	(3,643)
Loss from discontinued operations before taxes		(7)
Benefit of income taxes		(3)
Loss from discontinued operations		(4)
Net loss	(2,086)	(3,647)
Gibraltar Industries, Inc. [Member]
Schedule Of Supplemental Financial Information [Line Items]
Selling, general, and administrative expense	36	158
(Loss) income from operations	(36)	(158)
Interest expense (income)	3,361	10,883
(Loss) income before taxes	(3,397)	(11,041)
(Benefit of) provision for income taxes	(1,177)	(4,197)
(Loss) income from continuing operations	(2,220)	(6,844)
Equity in earnings from subsidiaries	315	3,407
Net loss	(1,905)	(3,437)
Guarantor Subsidiaries [Member]
Schedule Of Supplemental Financial Information [Line Items]
Net sales	172,781	178,049
Cost of sales	145,161	144,395
Gross profit	27,620	33,654
Selling, general, and administrative expense	27,763	28,881
(Loss) income from operations	(143)	4,773
Interest expense (income)	314	308
Other expense (income)	30	(66)
(Loss) income before taxes	(487)	4,531
(Benefit of) provision for income taxes	(234)	1,758
(Loss) income from continuing operations	(253)	2,773
Loss from discontinued operations before taxes		(7)
Benefit of income taxes		(3)
Loss from discontinued operations		(4)
Equity in earnings from subsidiaries	568	638
Net loss	315	3,407
Non-Guarantor Subsidiaries [Member]
Schedule Of Supplemental Financial Information [Line Items]
Net sales	22,919	23,217
Cost of sales	20,494	20,484
Gross profit	2,425	2,733
Selling, general, and administrative expense	1,732	1,942
(Loss) income from operations	693	791
Interest expense (income)	(35)	(31)
(Loss) income before taxes	728	822
(Benefit of) provision for income taxes	160	184
(Loss) income from continuing operations	568	638
Net loss	568	638
Eliminations [Member]
Schedule Of Supplemental Financial Information [Line Items]
Net sales	(4,668)	(4,465)
Cost of sales	(4,487)	(4,255)
Gross profit	(181)	(210)
(Loss) income from operations	(181)	(210)
(Loss) income before taxes	(181)	(210)
(Loss) income from continuing operations	(181)	(210)
Equity in earnings from subsidiaries	(883)	(4,045)
Net loss	$ (1,064)	$ (4,255)