Supplemental Financial Information (Condensed Consolidating Statements of Cash Flows) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities of continuing operations	$ 32,583	$ 60,304	$ 50,232
Net cash used in operating activities of discontinued operations	(41)	(9)	(151)
Net cash provided by operating activities	32,542	60,295	50,081
Cash Flows from Investing Activities
Other investing activities	277	0	0
Cash paid for acquisitions, net of cash acquired	0	(5,536)	(45,071)
Purchases of property, plant, and equipment	(23,291)	(14,940)	(11,351)
Net proceeds from sale of property and equipment	5,992	12,610	659
Net cash used in investing activities	(17,022)	(7,866)	(55,763)
Cash Flows from Financing Activities
Long-term debt payments	(407)us-gaap_RepaymentsOfLongTermDebt	(205,094)us-gaap_RepaymentsOfLongTermDebt	(473)us-gaap_RepaymentsOfLongTermDebt
Proceeds from long-term debt	0	210,000	0
Payment of deferred financing fees	(35)us-gaap_PaymentsOfFinancingCosts	(3,899)us-gaap_PaymentsOfFinancingCosts	(18)us-gaap_PaymentsOfFinancingCosts
Payment of note redemption fees	0	(3,702)	0
Purchase of treasury stock at market prices	(575)	(714)	(970)
Intercompany financing	0rock_InterCompanyFinancing	0rock_InterCompanyFinancing	0rock_InterCompanyFinancing
Excess tax benefit from stock compensation	100	72	10
Net proceeds from issuance of common stock	595	648	278
Net cash used in financing activities	(322)	(2,689)	(1,173)
Effect of exchange rate changes on cash	(1,627)	(729)	766
Net increase (decrease) in cash and cash equivalents	13,571	49,011	(6,089)
Cash and cash equivalents at beginning of year	97,039	48,028	54,117
Cash and cash equivalents at end of year	110,610	97,039	48,028
Gibraltar Industries, Inc.
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities of continuing operations	(13,437)	(9,023)	(16,435)
Net cash used in operating activities of discontinued operations	0	0	0
Net cash provided by operating activities	(13,437)	(9,023)	(16,435)
Cash Flows from Investing Activities
Other investing activities	0
Cash paid for acquisitions, net of cash acquired		0	0
Purchases of property, plant, and equipment	0	0	0
Net proceeds from sale of property and equipment	0	0	0
Net cash used in investing activities	0	0	0
Cash Flows from Financing Activities
Long-term debt payments	0	(204,000)	0
Proceeds from long-term debt		210,000
Payment of deferred financing fees	0	(3,858)	0
Payment of note redemption fees		(3,702)
Purchase of treasury stock at market prices	(575)	(714)	(970)
Intercompany financing	13,317	10,577	17,116
Excess tax benefit from stock compensation	100	72	11
Net proceeds from issuance of common stock	595	648	278
Net cash used in financing activities	13,437	9,023	16,435
Effect of exchange rate changes on cash	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of year	0	0	0
Cash and cash equivalents at end of year	0	0	0
Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities of continuing operations	40,820	64,994	58,628
Net cash used in operating activities of discontinued operations	(41)	(9)	(151)
Net cash provided by operating activities	40,779	64,985	58,477
Cash Flows from Investing Activities
Other investing activities	277
Cash paid for acquisitions, net of cash acquired		(5,536)	(42,366)
Purchases of property, plant, and equipment	(19,286)	(11,719)	(9,868)
Net proceeds from sale of property and equipment	5,989	12,592	311
Net cash used in investing activities	(13,020)	(4,663)	(51,923)
Cash Flows from Financing Activities
Long-term debt payments	(407)	(1,094)	(473)
Proceeds from long-term debt		0
Payment of deferred financing fees	(35)	(41)	(18)
Payment of note redemption fees		0
Purchase of treasury stock at market prices	0	0	0
Intercompany financing	(11,707)	(9,494)	(14,590)
Excess tax benefit from stock compensation	0	0	(1)
Net proceeds from issuance of common stock	0	0	0
Net cash used in financing activities	(12,149)	(10,629)	(15,082)
Effect of exchange rate changes on cash	0	0	0
Net increase (decrease) in cash and cash equivalents	15,610	49,693	(8,528)
Cash and cash equivalents at beginning of year	75,856	26,163	34,691
Cash and cash equivalents at end of year	91,466	75,856	26,163
Non-Guarantor Subsidiaries
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities of continuing operations	5,200	4,333	8,039
Net cash used in operating activities of discontinued operations	0	0	0
Net cash provided by operating activities	5,200	4,333	8,039
Cash Flows from Investing Activities
Other investing activities	0
Cash paid for acquisitions, net of cash acquired		0	(2,705)
Purchases of property, plant, and equipment	(4,005)	(3,221)	(1,483)
Net proceeds from sale of property and equipment	3	18	348
Net cash used in investing activities	(4,002)	(3,203)	(3,840)
Cash Flows from Financing Activities
Long-term debt payments	0	0	0
Proceeds from long-term debt		0
Payment of deferred financing fees	0	0	0
Payment of note redemption fees		0
Purchase of treasury stock at market prices	0	0	0
Intercompany financing	(1,610)	(1,083)	(2,526)
Excess tax benefit from stock compensation	0	0	0
Net proceeds from issuance of common stock	0	0	0
Net cash used in financing activities	(1,610)	(1,083)	(2,526)
Effect of exchange rate changes on cash	(1,627)	(729)	766
Net increase (decrease) in cash and cash equivalents	(2,039)	(682)	2,439
Cash and cash equivalents at beginning of year	21,183	21,865	19,426
Cash and cash equivalents at end of year	19,144	21,183	21,865
Eliminations
Condensed Cash Flow Statements, Captions [Line Items]
Net cash (used in) provided by operating activities of continuing operations	0	0	0
Net cash used in operating activities of discontinued operations	0	0	0
Net cash provided by operating activities	0	0	0
Cash Flows from Investing Activities
Other investing activities	0
Cash paid for acquisitions, net of cash acquired		0	0
Purchases of property, plant, and equipment	0	0	0
Net proceeds from sale of property and equipment	0	0	0
Net cash used in investing activities	0	0	0
Cash Flows from Financing Activities
Long-term debt payments	0	0	0
Proceeds from long-term debt		0
Payment of deferred financing fees	0	0	0
Payment of note redemption fees		0
Purchase of treasury stock at market prices	0	0	0
Intercompany financing	0	0	0
Excess tax benefit from stock compensation	0	0	0
Net proceeds from issuance of common stock	0	0	0
Net cash used in financing activities	0	0	0
Effect of exchange rate changes on cash	0	0	0
Net increase (decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents at beginning of year	0	0	0
Cash and cash equivalents at end of year	$ 0	$ 0	$ 0

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