Supplemental Financial Information (Schedule Of Consolidating Balance Sheets, Supplemental Disclosures) (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010	May 24, 2010	Dec. 31, 2009
Cash and cash equivalents	$ 21,093,000	$ 60,866,000	$ 26,817,000		$ 23,596,000
Accounts receivable, net	124,753,000	70,371,000
Inventories	115,742,000	77,848,000
Other current assets	24,746,000	20,229,000
Assets of discontinued operations	2,501,000	13,063,000
Total current assets	288,835,000	242,377,000
Property, plant, and equipment, net	157,529,000	145,783,000
Goodwill	350,363,000	298,346,000
Acquired intangibles	99,308,000	66,301,000
Equity method investment		1,345,000		1,500,000
Other Assets Noncurrent	7,570,000	16,766,000
Assets of discontinued operations		39,972,000
Total assets	903,605,000	810,890,000
Accounts payable	84,181,000	56,775,000
Accrued expenses	55,280,000	36,785,000
Current maturities of long-term debt	408,000	408,000
Liabilities of discontinued operations	31,000	6,150,000
Total current liabilities	139,900,000	100,118,000
Long-term debt	226,590,000	206,789,000
Deferred income taxes	51,661,000	37,119,000
Other non-current liabilities	22,877,000	23,221,000
Liabilities of discontinued operations		2,790,000
Shareholders' equity	462,577,000	440,853,000
Total liabilities and shareholders' equity	903,605,000	810,890,000
Gibraltar Industries, Inc. [Member]
Cash and cash equivalents
Intercompany balances	(86,329,000)	17,194,000
Other current assets	3,319,000	6,592,000
Total current assets	(83,010,000)	23,786,000
Other Assets Noncurrent	3,251,000	3,613,000
Investment in subsidiaries	745,840,000	616,787,000
Total assets	666,081,000	644,186,000
Accrued expenses	1,360,000	1,360,000
Total current liabilities	1,360,000	1,360,000
Long-term debt	202,144,000	201,973,000
Shareholders' equity	462,577,000	440,853,000
Total liabilities and shareholders' equity	666,081,000	644,186,000
Guarantor Subsidiaries [Member]
Cash and cash equivalents	3,312,000	46,349,000	14,386,000		10,105,000
Accounts receivable, net	107,564,000	57,268,000
Intercompany balances	110,415,000	5,657,000
Inventories	107,153,000	71,355,000
Other current assets	20,341,000	12,750,000
Assets of discontinued operations	2,501,000	10,501,000
Total current assets	351,286,000	203,880,000
Property, plant, and equipment, net	144,464,000	132,355,000
Goodwill	320,843,000	270,245,000
Acquired intangibles	88,981,000	55,827,000
Equity method investment		1,345,000
Other Assets Noncurrent	4,318,000	13,152,000
Assets of discontinued operations		34,503,000
Investment in subsidiaries	55,737,000	55,172,000
Total assets	965,629,000	766,479,000
Accounts payable	74,751,000	48,739,000
Accrued expenses	50,888,000	33,053,000
Current maturities of long-term debt	408,000	408,000
Liabilities of discontinued operations	31,000	4,576,000
Total current liabilities	126,078,000	86,776,000
Long-term debt	24,446,000	4,816,000
Deferred income taxes	47,000,000	35,176,000
Other non-current liabilities	22,265,000	22,763,000
Liabilities of discontinued operations		161,000
Shareholders' equity	745,840,000	616,787,000
Total liabilities and shareholders' equity	965,629,000	766,479,000
Non-Guarantor Subsidiaries [Member]
Cash and cash equivalents	17,781,000	14,517,000	12,431,000		13,491,000
Accounts receivable, net	17,189,000	13,103,000
Intercompany balances	(24,086,000)	(22,851,000)
Inventories	8,589,000	6,493,000
Other current assets	1,086,000	887,000
Assets of discontinued operations		2,562,000
Total current assets	20,559,000	14,711,000
Property, plant, and equipment, net	13,065,000	13,428,000
Goodwill	29,520,000	28,101,000
Acquired intangibles	10,327,000	10,474,000
Other Assets Noncurrent	1,000	1,000
Assets of discontinued operations		5,469,000
Total assets	73,472,000	72,184,000
Accounts payable	9,430,000	8,036,000
Accrued expenses	3,032,000	2,372,000
Liabilities of discontinued operations		1,574,000
Total current liabilities	12,462,000	11,982,000
Deferred income taxes	4,661,000	1,943,000
Other non-current liabilities	612,000	458,000
Liabilities of discontinued operations		2,629,000
Shareholders' equity	55,737,000	55,172,000
Total liabilities and shareholders' equity	73,472,000	72,184,000
Eliminations [Member]
Cash and cash equivalents
Investment in subsidiaries	(801,577,000)	(671,959,000)
Total assets	(801,577,000)	(671,959,000)
Shareholders' equity	(801,577,000)	(671,959,000)
Total liabilities and shareholders' equity	$ (801,577,000)	$ (671,959,000)