Supplemental Financial Information (Schedule Of Consolidating Balance Sheets) (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	$ 87,757,000	$ 97,039,000	$ 44,637,000	$ 48,028,000
Accounts receivable, net of reserve of $4,672 and $4,774 in 2014 and 2013	129,765,000	90,082,000
Intercompany balances	0	0
Inventories	126,577,000	121,152,000
Other current assets	18,148,000	14,127,000
Total current assets	362,247,000	322,400,000
Property, plant, and equipment, net	128,774,000	131,752,000
Goodwill	341,196,000	341,174,000
Acquired intangibles	88,974,000	91,777,000
Other assets	7,436,000	7,059,000
Investment in subsidiaries	0	0
Total assets	928,627,000	894,162,000
Accounts payable	99,264,000	69,625,000
Accrued expenses	50,848,000	49,879,000
Current maturities of long-term debt	400,000	409,000
Total current liabilities	150,512,000	119,913,000
Long-term debt	213,200,000	213,598,000
Deferred income taxes	55,178,000	55,124,000
Other non-current liabilities	32,227,000	33,778,000
Total shareholders’ equity	477,510,000	471,749,000
Total liabilities and shareholders' equity	928,627,000	894,162,000
Gibraltar Industries, Inc.
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	0	0	0	0
Accounts receivable, net of reserve of $4,672 and $4,774 in 2014 and 2013	0	0
Intercompany balances	26,553,000	23,618,000
Inventories	0	0
Other current assets	2,403,000	7,578,000
Total current assets	28,956,000	31,196,000
Property, plant, and equipment, net	0	0
Goodwill	0	0
Acquired intangibles	0	0
Other assets	3,173,000	3,415,000
Investment in subsidiaries	660,238,000	652,689,000
Total assets	692,367,000	687,300,000
Accounts payable	0	0
Accrued expenses	4,857,000	5,551,000
Current maturities of long-term debt	0	0
Total current liabilities	4,857,000	5,551,000
Long-term debt	210,000,000	210,000,000
Deferred income taxes	0	0
Other non-current liabilities	0	0
Total shareholders’ equity	477,510,000	471,749,000
Total liabilities and shareholders' equity	692,367,000	687,300,000
Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	66,529,000	75,856,000	24,639,000	26,163,000
Accounts receivable, net of reserve of $4,672 and $4,774 in 2014 and 2013	117,885,000	79,356,000
Intercompany balances	(4,178,000)	(1,655,000)
Inventories	117,024,000	111,676,000
Other current assets	14,338,000	5,722,000
Total current assets	311,598,000	270,955,000
Property, plant, and equipment, net	115,308,000	119,587,000
Goodwill	334,123,000	334,123,000
Acquired intangibles	83,325,000	86,014,000
Other assets	4,263,000	3,643,000
Investment in subsidiaries	34,287,000	33,259,000
Total assets	882,904,000	847,581,000
Accounts payable	91,509,000	62,464,000
Accrued expenses	43,104,000	42,418,000
Current maturities of long-term debt	400,000	409,000
Total current liabilities	135,013,000	105,291,000
Long-term debt	3,200,000	3,598,000
Deferred income taxes	52,773,000	52,746,000
Other non-current liabilities	31,680,000	33,257,000
Total shareholders’ equity	660,238,000	652,689,000
Total liabilities and shareholders' equity	882,904,000	847,581,000
Non-Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	21,228,000	21,183,000	19,998,000	21,865,000
Accounts receivable, net of reserve of $4,672 and $4,774 in 2014 and 2013	11,880,000	10,726,000
Intercompany balances	(22,375,000)	(21,963,000)
Inventories	9,553,000	9,476,000
Other current assets	1,407,000	827,000
Total current assets	21,693,000	20,249,000
Property, plant, and equipment, net	13,466,000	12,165,000
Goodwill	7,073,000	7,051,000
Acquired intangibles	5,649,000	5,763,000
Other assets	0	1,000
Investment in subsidiaries	0	0
Total assets	47,881,000	45,229,000
Accounts payable	7,755,000	7,161,000
Accrued expenses	2,887,000	1,910,000
Current maturities of long-term debt	0	0
Total current liabilities	10,642,000	9,071,000
Long-term debt	0	0
Deferred income taxes	2,405,000	2,378,000
Other non-current liabilities	547,000	521,000
Total shareholders’ equity	34,287,000	33,259,000
Total liabilities and shareholders' equity	47,881,000	45,229,000
Eliminations
Schedule Of Supplemental Financial Information [Line Items]
Cash and cash equivalents	0	0	0	0
Accounts receivable, net of reserve of $4,672 and $4,774 in 2014 and 2013	0	0
Intercompany balances	0	0
Inventories	0	0
Other current assets	0	0
Total current assets	0	0
Property, plant, and equipment, net	0	0
Goodwill	0	0
Acquired intangibles	0	0
Other assets	0	0
Investment in subsidiaries	(694,525,000)	(685,948,000)
Total assets	(694,525,000)	(685,948,000)
Accounts payable	0	0
Accrued expenses	0	0
Current maturities of long-term debt	0	0
Total current liabilities	0	0
Long-term debt	0	0
Deferred income taxes	0	0
Other non-current liabilities	0	0
Total shareholders’ equity	(694,525,000)	(685,948,000)
Total liabilities and shareholders' equity	$ (694,525,000)	$ (685,948,000)