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Supplemental Financial Information (Schedule of Consolidating Statements of Comprehensive Income) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Schedule Of Supplemental Financial Information [Line Items]        
Net income $ 13,632 $ 9,540 $ 23,228 $ 13,885
Other comprehensive income:        
Foreign currency translation adjustment (3,005) (2,734) (4,667) (2,096)
Reclassification of loss on cash flow hedges, net of tax 0 714 143 (242)
Adjustment to retirement benefit liability, net of tax 3 2 7 6
Adjustment to post-retirement health care liability, net of tax 36 19 110 56
Other comprehensive loss (2,966) (1,999) (4,407) (2,276)
Total comprehensive income 10,666 7,541 18,821 11,609
Gibraltar Industries, Inc.        
Schedule Of Supplemental Financial Information [Line Items]        
Net income 15,503 9,794 25,553 14,673
Other comprehensive income:        
Foreign currency translation adjustment 0 0 0 0
Reclassification of loss on cash flow hedges, net of tax 0 0 0 0
Adjustment to retirement benefit liability, net of tax 0 0 0 0
Adjustment to post-retirement health care liability, net of tax 0 0 0 0
Other comprehensive loss 0 0 0 0
Total comprehensive income 15,503 9,794 25,553 14,673
Guarantor Subsidiaries        
Schedule Of Supplemental Financial Information [Line Items]        
Net income 17,742 12,059 32,248 21,399
Other comprehensive income:        
Foreign currency translation adjustment 0 0 0 0
Reclassification of loss on cash flow hedges, net of tax 0 714 143 (242)
Adjustment to retirement benefit liability, net of tax 3 2 7 6
Adjustment to post-retirement health care liability, net of tax 36 19 110 56
Other comprehensive loss 39 735 260 (180)
Total comprehensive income 17,781 12,794 32,508 21,219
Non-Guarantor Subsidiaries        
Schedule Of Supplemental Financial Information [Line Items]        
Net income 1,411 854 1,959 2,216
Other comprehensive income:        
Foreign currency translation adjustment (3,005) (2,734) (4,667) (2,096)
Reclassification of loss on cash flow hedges, net of tax 0 0 0 0
Adjustment to retirement benefit liability, net of tax 0 0 0 0
Adjustment to post-retirement health care liability, net of tax 0 0 0 0
Other comprehensive loss (3,005) (2,734) (4,667) (2,096)
Total comprehensive income (1,594) (1,880) (2,708) 120
Eliminations        
Schedule Of Supplemental Financial Information [Line Items]        
Net income (21,024) (13,167) (36,532) (24,403)
Other comprehensive income:        
Foreign currency translation adjustment 0 0 0 0
Reclassification of loss on cash flow hedges, net of tax 0 0 0 0
Adjustment to retirement benefit liability, net of tax 0 0 0 0
Adjustment to post-retirement health care liability, net of tax 0 0 0 0
Other comprehensive loss 0 0 0 0
Total comprehensive income $ (21,024) $ (13,167) $ (36,532) $ (24,403)