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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, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Schedule Of Supplemental Financial Information [Line Items] |  |  |  |  |  |  |  |
Net income | $ 19,503 | $ 22,837 | $ 8,352 | $ 20,619 | $ 12,769 | $ 3,996 | $ 50,692 | $ 37,384
Other comprehensive income (loss): |  |  |  |  |  |  |  |
Foreign currency translation adjustment | 139 | (1,787) | 110 | 1,581 | 1,091 | 679 | (1,538) | 3,351
Cumulative effect of accounting change (see Note 2) |  |  |  |  |  |  | (350) |
Adjustment to retirement benefit liability, net of tax | (5) |  |  | (2) |  |  | (15) | (8)
Adjustment to post employment health care benefit liability, net of tax | 32 | $ 31 | $ 32 | 29 | $ 30 | $ 29 | 95 | 88
Other comprehensive income (loss) | 166 |  |  | 1,608 |  |  | (1,808) | 3,431
Total comprehensive income | 19,669 |  |  | 22,227 |  |  | 48,884 | 40,815
Reportable Legal Entities | Guarantor Subsidiaries |  |  |  |  |  |  |  |
Schedule Of Supplemental Financial Information [Line Items] |  |  |  |  |  |  |  |
Net income | 22,149 |  |  | 23,211 |  |  | 58,637 | 44,356
Other comprehensive income (loss): |  |  |  |  |  |  |  |
Foreign currency translation adjustment | 0 |  |  | 0 |  |  | 0 | 0
Cumulative effect of accounting change (see Note 2) |  |  |  |  |  |  | (350) |
Adjustment to retirement benefit liability, net of tax | (5) |  |  | (2) |  |  | (15) | (8)
Adjustment to post employment health care benefit liability, net of tax | 32 |  |  | 29 |  |  | 95 | 88
Other comprehensive income (loss) | 27 |  |  | 27 |  |  | (270) | 80
Total comprehensive income | 22,176 |  |  | 23,238 |  |  | 58,367 | 44,436
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |  |  |  |  |  |  |
Schedule Of Supplemental Financial Information [Line Items] |  |  |  |  |  |  |  |
Net income | 888 |  |  | 293 |  |  | 3,312 | (1,747)
Other comprehensive income (loss): |  |  |  |  |  |  |  |
Foreign currency translation adjustment | 139 |  |  | 1,581 |  |  | (1,538) | 3,351
Cumulative effect of accounting change (see Note 2) |  |  |  |  |  |  | 0 |
Adjustment to retirement benefit liability, net of tax | 0 |  |  | 0 |  |  | 0 | 0
Adjustment to post employment health care benefit liability, net of tax | 0 |  |  | 0 |  |  | 0 | 0
Other comprehensive income (loss) | 139 |  |  | 1,581 |  |  | (1,538) | 3,351
Total comprehensive income | 1,027 |  |  | 1,874 |  |  | 1,774 | 1,604
Reportable Legal Entities | Gibraltar Industries, Inc. |  |  |  |  |  |  |  |
Schedule Of Supplemental Financial Information [Line Items] |  |  |  |  |  |  |  |
Net income | 19,674 |  |  | 20,899 |  |  | 51,205 | 37,846
Other comprehensive income (loss): |  |  |  |  |  |  |  |
Foreign currency translation adjustment | 0 |  |  | 0 |  |  | 0 | 0
Cumulative effect of accounting change (see Note 2) |  |  |  |  |  |  | 0 |
Adjustment to retirement benefit liability, net of tax | 0 |  |  | 0 |  |  | 0 | 0
Adjustment to post employment health care benefit liability, net of tax | 0 |  |  | 0 |  |  | 0 | 0
Other comprehensive income (loss) | 0 |  |  | 0 |  |  | 0 | 0
Total comprehensive income | 19,674 |  |  | 20,899 |  |  | 51,205 | 37,846
Eliminations |  |  |  |  |  |  |  |
Schedule Of Supplemental Financial Information [Line Items] |  |  |  |  |  |  |  |
Net income | (23,208) |  |  | (23,784) |  |  | (62,462) | (43,071)
Other comprehensive income (loss): |  |  |  |  |  |  |  |
Foreign currency translation adjustment | 0 |  |  | 0 |  |  | 0 | 0
Cumulative effect of accounting change (see Note 2) |  |  |  |  |  |  | 0 |
Adjustment to retirement benefit liability, net of tax | 0 |  |  | 0 |  |  | 0 | 0
Adjustment to post employment health care benefit liability, net of tax | 0 |  |  | 0 |  |  | 0 | 0
Other comprehensive income (loss) | 0 |  |  | 0 |  |  | 0 | 0
Total comprehensive income | $ (23,208) |  |  | $ (23,784) |  |  | $ (62,462) | $ (43,071)

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