Supplemental Financial Information (Schedule Of Condensed Consolidating Statements Of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Schedule Of Supplemental Financial Information [Line Items]
Net cash (used in) provided by operating activities of continuing operations	$ (3,785)	$ 5,269
Net cash used in operating activities of discontinued operations	0	(7)
Net cash (used in) provided by operating activities	(3,785)	5,262
Purchases of property, plant, and equipment	(11,498)	(4,741)
Cash paid for acquisitions, net of cash acquired	0	(146)
Other investing activities	121	0
Net proceeds from sale of property and equipment	5,950	247
Net cash used in investing activities	(5,427)	(4,640)
Long-term debt payments	(407)	(205,080)
Proceeds from long-term debt	0	210,000
Payment of note redemption fees	0	(3,702)
Purchase of treasury stock at market prices	(408)	(636)
Payment of deferred financing costs	0	(3,755)
Net proceeds from issuance of common stock	404	336
Intercompany financing	0	0
Excess tax benefit from stock compensation	81	62
Net cash used in financing activities	(330)	(2,775)
Effect of exchange rate changes on cash	260	(1,238)
Net decrease in cash and cash equivalents	(9,282)	(3,391)
Cash and cash equivalents at beginning of year	97,039	48,028
Cash and cash equivalents at end of period	87,757	44,637
Gibraltar Industries, Inc.
Schedule Of Supplemental Financial Information [Line Items]
Net cash (used in) provided by operating activities of continuing operations		(2,905)
Net cash used in operating activities of discontinued operations		0
Net cash (used in) provided by operating activities	(6,664)	(2,905)
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	(408)	(636)
Payment of deferred financing costs		(3,755)
Net proceeds from issuance of common stock	404	336
Intercompany financing	6,587	4,600
Excess tax benefit from stock compensation	81	62
Net cash used in financing activities	6,664	2,905
Effect of exchange rate changes on cash	0	0
Net decrease 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 (used in) provided by operating activities of continuing operations		7,090
Net cash used in operating activities of discontinued operations		(7)
Net cash (used in) provided by operating activities	272	7,083
Purchases of property, plant, and equipment	(9,232)	(3,533)
Cash paid for acquisitions, net of cash acquired		(146)
Other investing activities	121
Net proceeds from sale of property and equipment	5,947	247
Net cash used in investing activities	(3,164)	(3,432)
Long-term debt payments	(407)	(1,080)
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	(6,028)	(4,095)
Excess tax benefit from stock compensation	0	0
Net cash used in financing activities	(6,435)	(5,175)
Effect of exchange rate changes on cash	0	0
Net decrease in cash and cash equivalents	(9,327)	(1,524)
Cash and cash equivalents at beginning of year	75,856	26,163
Cash and cash equivalents at end of period	66,529	24,639
Non-Guarantor Subsidiaries
Schedule Of Supplemental Financial Information [Line Items]
Net cash (used in) provided by operating activities of continuing operations		1,084
Net cash used in operating activities of discontinued operations		0
Net cash (used in) provided by operating activities	2,607	1,084
Purchases of property, plant, and equipment	(2,266)	(1,208)
Cash paid for acquisitions, net of cash acquired		0
Other investing activities	0
Net proceeds from sale of property and equipment	3	0
Net cash used in investing activities	(2,263)	(1,208)
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	(559)	(505)
Excess tax benefit from stock compensation	0	0
Net cash used in financing activities	(559)	(505)
Effect of exchange rate changes on cash	260	(1,238)
Net decrease in cash and cash equivalents	45	(1,867)
Cash and cash equivalents at beginning of year	21,183	21,865
Cash and cash equivalents at end of period	21,228	19,998
Eliminations
Schedule Of Supplemental Financial Information [Line Items]
Net cash (used in) provided by operating activities of continuing operations		0
Net cash used in operating activities of discontinued operations		0
Net cash (used in) 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 decrease 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