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Supplemental Financial Information (Consolidating Statements of Operations) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Condensed Income Statements, Captions [Line Items]                      
Net sales: $ 240,913 $ 280,086 $ 266,036 $ 215,337 $ 258,112 $ 274,574 $ 247,627 $ 206,605 $ 1,002,372 $ 986,918 $ 1,007,981
Cost of sales                 760,012 750,374 763,219
Gross profit 53,260 70,279 70,503 48,318 56,729 68,735 61,825 49,255 242,360 236,544 244,762
Selling, general, and administrative expense                 146,840 143,448 161,099
Intangible asset impairment                 1,552 247 10,175
Income from operations 18,447 29,404 32,274 13,843 22,547 35,693 24,930 9,679 93,968 92,849 73,488
Interest expense, net 2,759 2,906 3,130 3,269 3,420 3,486 3,550 3,576 12,064 14,032 14,577
Other expense                 1,959 909 8,928
Income before taxes                 79,945 77,908 49,983
Provision for income taxes                 16,136 14,943 16,264
Income from continuing operations 13,117 19,503 22,837 8,352 25,176 20,619 13,174 3,996 63,809 62,965 33,719
Loss before taxes                 0 (644) (70)
Benefit of income taxes                 0 (239) (26)
Loss from discontinued operations         0 0 (405) 0 0 (405) (44)
Equity in earnings from subsidiaries                 0 0 0
Net income $ 13,117 $ 19,503 $ 22,837 $ 8,352 $ 25,176 $ 20,619 $ 12,769 $ 3,996 63,809 62,560 33,675
Gibraltar Industries, Inc.                      
Condensed Income Statements, Captions [Line Items]                      
Net sales:                 0 0 0
Cost of sales                 0 0 0
Gross profit                 0 0 0
Selling, general, and administrative expense                 151 147 14,302
Intangible asset impairment                 0 0 0
Income from operations                 (151) (147) (14,302)
Interest expense, net                 13,609 13,609 13,609
Other expense                 0 0 8,716
Income before taxes                 (13,760) (13,756) (36,627)
Provision for income taxes                 (3,853) (5,079) (11,768)
Income from continuing operations                   (8,677) (24,859)
Loss before taxes                   0 0
Benefit of income taxes                   0 0
Loss from discontinued operations                   0 0
Equity in earnings from subsidiaries                 74,544 72,261 57,857
Net income                 64,637 63,584 32,998
Guarantor Subsidiaries                      
Condensed Income Statements, Captions [Line Items]                      
Net sales:                 960,142 947,604 950,945
Cost of sales                 728,187 719,587 722,315
Gross profit                 231,955 228,017 228,630
Selling, general, and administrative expense                 139,726 133,409 137,343
Intangible asset impairment                 615 200 7,980
Income from operations                 91,614 94,408 83,307
Interest expense, net                 (1,279) 512 1,042
Other expense                 3,396 500 512
Income before taxes                 89,497 93,396 81,753
Provision for income taxes                 18,544 19,787 27,551
Income from continuing operations                   73,609 54,202
Loss before taxes                   (644) (70)
Benefit of income taxes                   (239) (26)
Loss from discontinued operations                   (405) (44)
Equity in earnings from subsidiaries                 3,591 (943) 3,699
Net income                 74,544 72,261 57,857
Non-Guarantor Subsidiaries                      
Condensed Income Statements, Captions [Line Items]                      
Net sales:                 64,090 52,738 78,184
Cost of sales                 52,857 43,187 62,729
Gross profit                 11,233 9,551 15,455
Selling, general, and administrative expense                 6,963 9,892 9,454
Intangible asset impairment                 937 47 2,195
Income from operations                 3,333 (388) 3,806
Interest expense, net                 (266) (89) (74)
Other expense                 (1,437) 409 (300)
Income before taxes                 5,036 (708) 4,180
Provision for income taxes                 1,445 235 481
Income from continuing operations                   (943) 3,699
Loss before taxes                   0 0
Benefit of income taxes                   0 0
Loss from discontinued operations                   0 0
Equity in earnings from subsidiaries                 0 0 0
Net income                 3,591 (943) 3,699
Eliminations                      
Condensed Income Statements, Captions [Line Items]                      
Net sales:                 (21,860) (13,424) (21,148)
Cost of sales                 (21,032) (12,400) (21,825)
Gross profit                 (828) (1,024) 677
Selling, general, and administrative expense                 0 0 0
Intangible asset impairment                 0 0 0
Income from operations                 (828) (1,024) 677
Interest expense, net                 0 0 0
Other expense                 0 0 0
Income before taxes                 (828) (1,024) 677
Provision for income taxes                 0 0 0
Income from continuing operations                   (1,024) 677
Loss before taxes                   0 0
Benefit of income taxes                   0 0
Loss from discontinued operations                   0 0
Equity in earnings from subsidiaries                 (78,135) (71,318) (61,556)
Net income                 $ (78,963) $ (72,342) $ (60,879)