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Supplemental Financial Information (Consolidating Statements Of Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net (loss) income $ 4,009 $ (13,727) $ 7,732 $ (3,647) $ (3,924) $ 7,301 $ 7,906 $ 1,362 $ (5,633) $ 12,645 $ 16,523
Foreign currency translation adjustment                 (2,108) 2,353 (1,232)
Adjustment to retirement benefit liability, net of tax                 53 (79) (187)
Adjustment to post-retirement healthcare benefit liability, net of tax                 45 (499) 129
Other comprehensive (loss) income                 (2,010) 1,775 (1,290)
Total comprehensive (loss) income                 (7,643) 14,420 15,233
Gibraltar Industries, Inc. [Member]
                      
Net (loss) income                 (4,864) 13,614 17,782
Total comprehensive (loss) income                 (4,864) 13,614 17,782
Guarantor Subsidiaries [Member]
                      
Net (loss) income                 9,041 24,535 28,392
Adjustment to retirement benefit liability, net of tax                 53 (79) (187)
Adjustment to post-retirement healthcare benefit liability, net of tax                 45 (499) 129
Other comprehensive (loss) income                 98 (578) (58)
Total comprehensive (loss) income                 9,139 23,957 28,334
Non-Guarantor Subsidiaries [Member]
                      
Net (loss) income                 (19,351) 3,960 3,979
Foreign currency translation adjustment                 (2,108) 2,353 (1,232)
Other comprehensive (loss) income                 (2,108) 2,353 (1,232)
Total comprehensive (loss) income                 (21,459) 6,313 2,747
Eliminations [Member]
                      
Net (loss) income                 9,541 (29,464) (33,630)
Total comprehensive (loss) income                 $ 9,541 $ (29,464) $ (33,630)