Supplemental Financial Information (Schedule Of Consolidating Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	$ 78,186	$ 97,039	$ 30,288	$ 48,028
Accounts receivable, net	106,639	90,082
Inventories	127,200	121,152
Other current assets	16,803	14,127
Total current assets	328,828	322,400
Property, plant, and equipment, net	130,476	131,752
Goodwill	340,942	341,174
Acquired intangibles	90,294	91,777
Other assets	6,495	7,059
Total assets	897,035	894,162
Accounts payable	82,813	69,625
Accrued expenses	42,739	49,879
Current maturities of long-term debt	405	409
Total current liabilities	125,957	119,913
Long-term debt	213,600	213,598
Deferred income taxes	55,113	55,124
Other non-current liabilities	32,877	33,778
Total shareholders' equity	469,488	471,749
Total liabilities and shareholders' equity	897,035	894,162
Gibraltar Industries, Inc. [Member]
Schedule Of Supplemental Financial Information [Line Items]
Intercompany balances	25,306	23,618
Other current assets	1,245	7,578
Total current assets	26,551	31,196
Other assets	3,294	3,415
Investment in subsidiaries	651,528	652,689
Total assets	681,373	687,300
Accrued expenses	1,885	5,551
Total current liabilities	1,885	5,551
Long-term debt	210,000	210,000
Total shareholders' equity	469,488	471,749
Total liabilities and shareholders' equity	681,373	687,300
Guarantor Subsidiaries [Member]
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	57,601	75,856	9,375	26,163
Accounts receivable, net	94,937	79,356
Intercompany balances	(2,582)	(1,655)
Inventories	117,693	111,676
Other current assets	14,497	5,722
Total current assets	282,146	270,955
Property, plant, and equipment, net	117,395	119,587
Goodwill	334,123	334,123
Acquired intangibles	84,667	86,014
Other assets	3,201	3,643
Investment in subsidiaries	32,499	33,259
Total assets	854,031	847,581
Accounts payable	75,171	62,464
Accrued expenses	38,225	42,418
Current maturities of long-term debt	405	409
Total current liabilities	113,801	105,291
Long-term debt	3,600	3,598
Deferred income taxes	52,759	52,746
Other non-current liabilities	32,343	33,257
Total shareholders' equity	651,528	652,689
Total liabilities and shareholders' equity	854,031	847,581
Non-Guarantor Subsidiaries [Member]
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	20,585	21,183	20,913	21,865
Accounts receivable, net	11,702	10,726
Intercompany balances	(22,724)	(21,963)
Inventories	9,507	9,476
Other current assets	1,061	827
Total current assets	20,131	20,249
Property, plant, and equipment, net	13,081	12,165
Goodwill	6,819	7,051
Acquired intangibles	5,627	5,763
Other assets		1
Total assets	45,658	45,229
Accounts payable	7,642	7,161
Accrued expenses	2,629	1,910
Total current liabilities	10,271	9,071
Deferred income taxes	2,354	2,378
Other non-current liabilities	534	521
Total shareholders' equity	32,499	33,259
Total liabilities and shareholders' equity	45,658	45,229
Eliminations [Member]
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents
Investment in subsidiaries	(684,027)	(685,948)
Total assets	(684,027)	(685,948)
Total shareholders' equity	(684,027)	(685,948)
Total liabilities and shareholders' equity	$ (684,027)	$ (685,948)