Supplemental Financial Information (Schedule Of Condensed Consolidating Statements Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Schedule Of Supplemental Financial Information [Line Items]
Net cash provided by operating activities of continuing operations	$ 18,185	$ 37,916
Net cash used in operating activities of discontinued operations	(40)	(9)
Net cash provided by operating activities	18,145	37,907
Purchases of property, plant, and equipment	(19,180)	(8,816)
Cash paid for acquisitions, net of cash acquired	0	(5,344)
Other investing activities	121	0
Net proceeds from sale of property and equipment	5,958	12,447
Net cash used in investing activities	(13,101)	(1,713)
Long-term debt payments	(407)	(205,084)
Proceeds from long-term debt	0	210,000
Payment of note redemption fees	0	(3,702)
Purchase of treasury stock at market prices	(505)	(642)
Payment of deferred financing costs	0	(3,858)
Net proceeds from issuance of common stock	508	342
Intercompany financing	0	0
Excess tax benefit from stock compensation	99	62
Net cash used in financing activities	(305)	(2,882)
Effect of exchange rate changes on cash	(765)	(492)
Net increase in cash and cash equivalents	3,974	32,820
Cash and cash equivalents at beginning of year	97,039	48,028
Cash and cash equivalents at end of period	101,013	80,848
Gibraltar Industries, Inc.
Schedule Of Supplemental Financial Information [Line Items]
Net cash provided by operating activities of continuing operations	(13,297)	(9,040)
Net cash used in operating activities of discontinued operations	0	0
Net cash provided by operating activities	(13,297)	(9,040)
Purchases of property, plant, and equipment	0	0
Cash paid for acquisitions, net of cash acquired		0
Other investing activities	0
Net proceeds from sale of property and equipment	0	0
Net cash used in investing activities	0	0
Long-term debt payments	0	(204,000)
Proceeds from long-term debt		210,000
Payment of note redemption fees		(3,702)
Purchase of treasury stock at market prices	(505)	(642)
Payment of deferred financing costs		(3,858)
Net proceeds from issuance of common stock	508	342
Intercompany financing	13,195	10,838
Excess tax benefit from stock compensation	99	62
Net cash used in financing activities	13,297	9,040
Effect of exchange rate changes on cash	0	0
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of year	0	0
Cash and cash equivalents at end of period	0	0
Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net cash provided by operating activities of continuing operations	27,470	44,203
Net cash used in operating activities of discontinued operations	(40)	(9)
Net cash provided by operating activities	27,430	44,194
Purchases of property, plant, and equipment	(16,297)	(6,196)
Cash paid for acquisitions, net of cash acquired		(5,344)
Other investing activities	121
Net proceeds from sale of property and equipment	5,955	12,434
Net cash used in investing activities	(10,221)	894
Long-term debt payments	(407)	(1,084)
Proceeds from long-term debt		0
Payment of note redemption fees		0
Purchase of treasury stock at market prices	0	0
Payment of deferred financing costs		0
Net proceeds from issuance of common stock	0	0
Intercompany financing	(12,573)	(10,211)
Excess tax benefit from stock compensation	0	0
Net cash used in financing activities	(12,980)	(11,295)
Effect of exchange rate changes on cash	0	0
Net increase in cash and cash equivalents	4,229	33,793
Cash and cash equivalents at beginning of year	75,856	26,163
Cash and cash equivalents at end of period	80,085	59,956
Non-Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net cash provided by operating activities of continuing operations	4,012	2,753
Net cash used in operating activities of discontinued operations	0	0
Net cash provided by operating activities	4,012	2,753
Purchases of property, plant, and equipment	(2,883)	(2,620)
Cash paid for acquisitions, net of cash acquired		0
Other investing activities	0
Net proceeds from sale of property and equipment	3	13
Net cash used in investing activities	(2,880)	(2,607)
Long-term debt payments	0	0
Proceeds from long-term debt		0
Payment of note redemption fees		0
Purchase of treasury stock at market prices	0	0
Payment of deferred financing costs		0
Net proceeds from issuance of common stock	0	0
Intercompany financing	(622)	(627)
Excess tax benefit from stock compensation	0	0
Net cash used in financing activities	(622)	(627)
Effect of exchange rate changes on cash	(765)	(492)
Net increase in cash and cash equivalents	(255)	(973)
Cash and cash equivalents at beginning of year	21,183	21,865
Cash and cash equivalents at end of period	20,928	20,892
Eliminations
Schedule Of Supplemental Financial Information [Line Items]
Net cash provided by operating activities of continuing operations	0	0
Net cash used in operating activities of discontinued operations	0	0
Net cash provided by operating activities	0	0
Purchases of property, plant, and equipment	0	0
Cash paid for acquisitions, net of cash acquired		0
Other investing activities	0
Net proceeds from sale of property and equipment	0	0
Net cash used in investing activities	0	0
Long-term debt payments	0	0
Proceeds from long-term debt		0
Payment of note redemption fees		0
Purchase of treasury stock at market prices	0	0
Payment of deferred financing costs		0
Net proceeds from issuance of common stock	0	0
Intercompany financing	0	0
Excess tax benefit from stock compensation	0	0
Net cash used in financing activities	0	0
Effect of exchange rate changes on cash	0	0
Net increase in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of year	0	0
Cash and cash equivalents at end of period	$ 0	$ 0