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Supplemental Financial Information (Consolidating Statements of Comprehensive Income) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 220 | $ 13,632 | $ 4,087 | $ 5,509 | $ (95,709) | $ 9,540 | $ 6,431 | $ (2,086) | $ 23,448 | $ (81,824) | $ (5,633)
Other comprehensive (loss) income: |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | (6,228) | (4,364) | (2,108)
Unrealized loss on cash flow hedges, net of tax |  |  |  |  |  |  |  |  | 143 | (143) | 0
Adjustment to retirement benefit liability, net of tax |  |  |  |  |  |  |  |  | 49 | (24) | 53
Adjustment to post-retirement healthcare benefit liability, net of tax |  |  |  |  |  |  |  |  | 171 | (1,435) | 45
Other comprehensive loss |  |  |  |  |  |  |  |  | (5,865) | (5,966) | (2,010)
Total comprehensive income (loss) |  |  |  |  |  |  |  |  | 17,583 | (87,790) | (7,643)
Gibraltar Industries, Inc. |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 27,036 | (80,650) | (4,864)
Other comprehensive (loss) income: |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Unrealized loss on cash flow hedges, net of tax |  |  |  |  |  |  |  |  | 0 | 0 |
Adjustment to retirement benefit liability, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Adjustment to post-retirement healthcare benefit liability, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other comprehensive loss |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total comprehensive income (loss) |  |  |  |  |  |  |  |  | 27,036 | (80,650) | (4,864)
Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 36,401 | (71,191) | 9,041
Other comprehensive (loss) income: |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Unrealized loss on cash flow hedges, net of tax |  |  |  |  |  |  |  |  | 143 | (143) |
Adjustment to retirement benefit liability, net of tax |  |  |  |  |  |  |  |  | 34 | 3 | 53
Adjustment to post-retirement healthcare benefit liability, net of tax |  |  |  |  |  |  |  |  | 171 | (1,435) | 45
Other comprehensive loss |  |  |  |  |  |  |  |  | 348 | (1,575) | 98
Total comprehensive income (loss) |  |  |  |  |  |  |  |  | 36,749 | (72,766) | 9,139
Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (1,213) | 2,929 | (19,351)
Other comprehensive (loss) income: |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | (6,228) | (4,364) | (2,108)
Unrealized loss on cash flow hedges, net of tax |  |  |  |  |  |  |  |  | 0 | 0 |
Adjustment to retirement benefit liability, net of tax |  |  |  |  |  |  |  |  | 15 | (27) | 0
Adjustment to post-retirement healthcare benefit liability, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other comprehensive loss |  |  |  |  |  |  |  |  | (6,213) | (4,391) | (2,108)
Total comprehensive income (loss) |  |  |  |  |  |  |  |  | (7,426) | (1,462) | (21,459)
Eliminations |  |  |  |  |  |  |  |  |  |  |
Condensed Statement of Income Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | (38,776) | 67,088 | 9,541
Other comprehensive (loss) income: |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment |  |  |  |  |  |  |  |  | 0 | 0 | 0
Unrealized loss on cash flow hedges, net of tax |  |  |  |  |  |  |  |  | 0 | 0 |
Adjustment to retirement benefit liability, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Adjustment to post-retirement healthcare benefit liability, net of tax |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other comprehensive loss |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total comprehensive income (loss) |  |  |  |  |  |  |  |  | $ (38,776) | $ 67,088 | $ 9,541

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