Supplemental Financial Information (Consolidating Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 110,610	$ 97,039	$ 48,028	$ 54,117
Accounts receivable, net of reserve	101,141us-gaap_AccountsReceivableNetCurrent	90,082us-gaap_AccountsReceivableNetCurrent
Intercompany balances	0rock_InterCompanyBalances	0rock_InterCompanyBalances
Inventories	128,743us-gaap_InventoryNet	121,152us-gaap_InventoryNet
Other current assets	19,937us-gaap_OtherAssetsCurrent	14,127us-gaap_OtherAssetsCurrent
Total current assets	360,431us-gaap_AssetsCurrent	322,400us-gaap_AssetsCurrent
Property, plant, and equipment, net	129,575us-gaap_PropertyPlantAndEquipmentNet	131,752us-gaap_PropertyPlantAndEquipmentNet
Goodwill	236,044us-gaap_Goodwill	341,174us-gaap_Goodwill	359,863us-gaap_Goodwill
Acquired intangibles	82,215	91,777
Other assets	5,895us-gaap_OtherAssetsNoncurrent	7,059us-gaap_OtherAssetsNoncurrent
Investment in subsidiaries	0us-gaap_Investments	0us-gaap_Investments
Total assets	814,160us-gaap_Assets	894,162us-gaap_Assets	883,674us-gaap_Assets
Current liabilities:
Accounts payable	81,246us-gaap_AccountsPayableCurrent	69,625us-gaap_AccountsPayableCurrent
Accrued expenses	52,439us-gaap_AccruedLiabilitiesCurrent	49,879us-gaap_AccruedLiabilitiesCurrent
Current maturities of long-term debt	400us-gaap_LongTermDebtCurrent	409us-gaap_LongTermDebtCurrent
Total current liabilities	134,085us-gaap_LiabilitiesCurrent	119,913us-gaap_LiabilitiesCurrent
Long-term debt	213,200us-gaap_LongTermDebtNoncurrent	213,598us-gaap_LongTermDebtNoncurrent
Deferred income taxes	49,772	55,124
Other non-current liabilities	29,874us-gaap_OtherLiabilitiesNoncurrent	33,778us-gaap_OtherLiabilitiesNoncurrent
Total shareholders’ equity	387,229us-gaap_StockholdersEquity	471,749us-gaap_StockholdersEquity	476,822us-gaap_StockholdersEquity	459,936us-gaap_StockholdersEquity
Total liabilities and shareholders' equity	814,160	894,162
Gibraltar Industries, Inc.
Current assets:
Cash and cash equivalents	0	0	0	0
Accounts receivable, net of reserve	0	0
Intercompany balances	21,619	23,618
Inventories	0	0
Other current assets	4,484	7,578
Total current assets	26,103	31,196
Property, plant, and equipment, net	0	0
Goodwill	0	0
Acquired intangibles	0	0
Other assets	2,931	3,415
Investment in subsidiaries	573,664	652,689
Total assets	602,698	687,300
Current liabilities:
Accounts payable	0	0
Accrued expenses	5,469	5,551
Current maturities of long-term debt	0	0
Total current liabilities	5,469	5,551
Long-term debt	210,000	210,000
Deferred income taxes	0	0
Other non-current liabilities	0	0
Total shareholders’ equity	387,229	471,749
Total liabilities and shareholders' equity	602,698	687,300
Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	91,466	75,856	26,163	34,691
Accounts receivable, net of reserve	91,713	79,356
Intercompany balances	(1,850)	(1,655)
Inventories	120,091	111,676
Other current assets	14,488	5,722
Total current assets	315,908	270,955
Property, plant, and equipment, net	116,628	119,587
Goodwill	229,558	334,123
Acquired intangibles	77,259	86,014
Other assets	2,964	3,643
Investment in subsidiaries	32,404	33,259
Total assets	774,721	847,581
Current liabilities:
Accounts payable	74,751	62,464
Accrued expenses	45,561	42,418
Current maturities of long-term debt	400	409
Total current liabilities	120,712	105,291
Long-term debt	3,200	3,598
Deferred income taxes	47,717	52,746
Other non-current liabilities	29,428	33,257
Total shareholders’ equity	573,664	652,689
Total liabilities and shareholders' equity	774,721	847,581
Non-Guarantor Subsidiaries
Current assets:
Cash and cash equivalents	19,144	21,183	21,865	19,426
Accounts receivable, net of reserve	9,428	10,726
Intercompany balances	(19,769)	(21,963)
Inventories	8,652	9,476
Other current assets	965	827
Total current assets	18,420	20,249
Property, plant, and equipment, net	12,947	12,165
Goodwill	6,486	7,051
Acquired intangibles	4,956	5,763
Other assets	0	1
Investment in subsidiaries	0	0
Total assets	42,809	45,229
Current liabilities:
Accounts payable	6,495	7,161
Accrued expenses	1,409	1,910
Current maturities of long-term debt	0	0
Total current liabilities	7,904	9,071
Long-term debt	0	0
Deferred income taxes	2,055	2,378
Other non-current liabilities	446	521
Total shareholders’ equity	32,404	33,259
Total liabilities and shareholders' equity	42,809	45,229
Eliminations
Current assets:
Cash and cash equivalents	0	0	0	0
Accounts receivable, net of reserve	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	(606,068)	(685,948)
Total assets	(606,068)	(685,948)
Current liabilities:
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	(606,068)	(685,948)
Total liabilities and shareholders' equity	$ (606,068)	$ (685,948)

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