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Supplemental Financial Information (Schedule of Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | $ (3,803) | $ 21,720
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired | 0 | (18,494)
Net proceeds from sale of property and equipment | 2,929 | 12,778
Purchases of property, plant, and equipment | (3,704) | (3,274)
Net cash used in investing activities | (775) | (8,990)
Cash Flows from Financing Activities |  |
Long-term debt payments | (400) | (400)
Purchase of treasury stock at market prices | (6,016) | (1,003)
Net proceeds from issuance of common stock | 526 | 247
Intercompany financing | 0 | 0
Net cash used in financing activities | (5,890) | (1,156)
Effect of exchange rate changes on cash | (1,069) | 628
Net (decrease) increase in cash and cash equivalents | (11,537) | 12,202
Cash and cash equivalents at beginning of year | 222,280 | 170,177
Cash and cash equivalents at end of period | 210,743 | 182,379
Reportable Legal Entities | Guarantor Subsidiaries |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 884 | 31,687
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired |  | (18,494)
Net proceeds from sale of property and equipment | 2,864 | 12,627
Purchases of property, plant, and equipment | (3,564) | (3,123)
Net cash used in investing activities | (700) | (8,990)
Cash Flows from Financing Activities |  |
Long-term debt payments | (400) | (400)
Purchase of treasury stock at market prices | 0 | 0
Net proceeds from issuance of common stock | 0 | 0
Intercompany financing | (10,509) | (7,280)
Net cash used in financing activities | (10,909) | (7,680)
Effect of exchange rate changes on cash | 0 | 0
Net (decrease) increase in cash and cash equivalents | (10,725) | 15,017
Cash and cash equivalents at beginning of year | 192,604 |
Cash and cash equivalents at end of period | 181,879 |
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 1,956 | (3,327)
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired |  | 0
Net proceeds from sale of property and equipment | 65 | 151
Purchases of property, plant, and equipment | (140) | (151)
Net cash used in investing activities | (75) | 0
Cash Flows from Financing Activities |  |
Long-term debt payments | 0 | 0
Purchase of treasury stock at market prices | 0 | 0
Net proceeds from issuance of common stock | 0 | 0
Intercompany financing | (1,624) | (116)
Net cash used in financing activities | (1,624) | (116)
Effect of exchange rate changes on cash | (1,069) | 628
Net (decrease) increase in cash and cash equivalents | (812) | (2,815)
Cash and cash equivalents at beginning of year | 29,676 |
Cash and cash equivalents at end of period | 28,864 |
Reportable Legal Entities | Gibraltar Industries, Inc. |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | (6,643) | (6,640)
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired |  | 0
Net proceeds from sale of property and equipment | 0 | 0
Purchases of property, plant, and equipment | 0 | 0
Net cash used in investing activities | 0 | 0
Cash Flows from Financing Activities |  |
Long-term debt payments | 0 | 0
Purchase of treasury stock at market prices | (6,016) | (1,003)
Net proceeds from issuance of common stock | 526 | 247
Intercompany financing | 12,133 | 7,396
Net cash used in financing activities | 6,643 | 6,640
Effect of exchange rate changes on cash | 0 | 0
Net (decrease) increase in cash and cash equivalents | 0 | 0
Cash and cash equivalents at beginning of year | 0 |
Cash and cash equivalents at end of period | 0 |
Eliminations |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 0 | 0
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired |  | 0
Net proceeds from sale of property and equipment | 0 | 0
Purchases of property, plant, and equipment | 0 | 0
Net cash used in investing activities | 0 | 0
Cash Flows from Financing Activities |  |
Long-term debt payments | 0 | 0
Purchase of treasury stock at market prices | 0 | 0
Net proceeds from issuance of common stock | 0 | 0
Intercompany financing | 0 | 0
Net cash used in financing activities | 0 | 0
Effect of exchange rate changes on cash | 0 | 0
Net (decrease) increase in cash and cash equivalents | 0 | $ 0
Cash and cash equivalents at beginning of year | 0 |
Cash and cash equivalents at end of period | $ 0 |

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