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Supplemental Financial Information (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities $ 97,545 $ 70,070 $ 123,987
Cash Flows from Investing Activities      
Purchases of property, plant, and equipment (12,457) (11,399) (10,779)
Acquisitions, net of cash acquired (5,241) (18,494) (23,412)
Net proceeds from sale of property and equipment 3,149 13,096 953
Net proceeds from sale of business 0 0 8,250
Net cash used in investing activities (14,549) (16,797) (23,870)
Other, net 0 0 1,118
Cash Flows from Financing Activities      
Long-term debt payments (400) (400) (400)
Payment of debt issuance costs 0 0 (54)
Purchase of treasury stock at market prices (7,165) (2,872) (1,539)
Intercompany financing 0 0 0
Net proceeds from issuance of common stock 1,385 674 3,341
Net cash (used in) provided by financing activities (6,180) (2,598) 1,348
Effect of exchange rate changes on cash (2,090) 1,428 (146)
Net increase in cash and cash equivalents 74,726 52,103 101,319
Cash and cash equivalents at beginning of year 222,280 170,177 68,858
Cash and cash equivalents at end of year 297,006 222,280 170,177
Gibraltar Industries, Inc.      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities (13,252) (15,172) (34,243)
Cash Flows from Investing Activities      
Purchases of property, plant, and equipment 0 0 0
Acquisitions, net of cash acquired 0 0 0
Net proceeds from sale of property and equipment 0 0 0
Net proceeds from sale of business     0
Net cash used in investing activities 0 0 0
Other, net     0
Cash Flows from Financing Activities      
Long-term debt payments 0 0 0
Payment of debt issuance costs     0
Purchase of treasury stock at market prices (7,165) (2,872) (1,539)
Intercompany financing 19,032 17,370 32,441
Net proceeds from issuance of common stock 1,385 674 3,341
Net cash (used in) provided by financing activities 13,252 15,172 34,243
Effect of exchange rate changes on cash 0 0 0
Net increase 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 provided by operating activities 103,543 83,114 140,890
Cash Flows from Investing Activities      
Purchases of property, plant, and equipment (12,054) (11,026) (10,321)
Acquisitions, net of cash acquired (5,241) (18,494) (23,412)
Net proceeds from sale of property and equipment 3,063 12,905 230
Net proceeds from sale of business     0
Net cash used in investing activities (14,232) (16,615) (32,385)
Other, net     1,118
Cash Flows from Financing Activities      
Long-term debt payments (400) (400) (400)
Payment of debt issuance costs     (54)
Purchase of treasury stock at market prices 0 0 0
Intercompany financing (18,799) (17,321) (3,822)
Net proceeds from issuance of common stock 0 0 0
Net cash (used in) provided by financing activities (19,199) (17,721) (4,276)
Effect of exchange rate changes on cash 0 0 0
Net increase in cash and cash equivalents 70,112 48,778 104,229
Cash and cash equivalents at beginning of year 192,604 143,826 39,597
Cash and cash equivalents at end of year 262,716 192,604 143,826
Non-Guarantor Subsidiaries      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities 7,254 2,128 17,340
Cash Flows from Investing Activities      
Purchases of property, plant, and equipment (403) (373) (458)
Acquisitions, net of cash acquired 0 0 0
Net proceeds from sale of property and equipment 86 191 723
Net proceeds from sale of business     8,250
Net cash used in investing activities (317) (182) 8,515
Cash Flows from Financing Activities      
Long-term debt payments 0 0 0
Payment of debt issuance costs     0
Purchase of treasury stock at market prices 0 0 0
Intercompany financing (233) (49) (28,619)
Net proceeds from issuance of common stock 0 0 0
Net cash (used in) provided by financing activities (233) (49) (28,619)
Effect of exchange rate changes on cash (2,090) 1,428 (146)
Net increase in cash and cash equivalents 4,614 3,325 (2,910)
Cash and cash equivalents at beginning of year 29,676 26,351 29,261
Cash and cash equivalents at end of year 34,290 29,676 26,351
Eliminations      
Condensed Cash Flow Statements, Captions [Line Items]      
Net cash provided by operating activities 0 0 0
Cash Flows from Investing Activities      
Purchases of property, plant, and equipment 0 0 0
Acquisitions, net of cash acquired 0 0 0
Net proceeds from sale of property and equipment 0 0 0
Net proceeds from sale of business     0
Net cash used in investing activities 0 0 0
Cash Flows from Financing Activities      
Long-term debt payments 0 0 0
Payment of debt issuance costs     0
Purchase of treasury stock at market prices 0 0 0
Intercompany financing 0 0 0
Net proceeds from issuance of common stock 0 0 0
Net cash (used in) provided by financing activities 0 0 0
Effect of exchange rate changes on cash 0 0 0
Net increase 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