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Supplemental Financial Information (Schedule of Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | $ (22,206) | $ 2,343
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired | 0 | (18,561)
Net proceeds from sale of property and equipment | 2,823 | 9,233
Purchases of property, plant, and equipment | (1,033) | (1,453)
Net cash provided by (used in) investing activities | 1,790 | (10,781)
Cash Flows from Financing Activities |  |
Purchase of treasury stock at market prices | (850) | (922)
Net proceeds from issuance of common stock | 226 | 11
Intercompany financing | 0 | 0
Net cash used in financing activities | (624) | (911)
Effect of exchange rate changes on cash | (499) | 73
Net decrease in cash and cash equivalents | (21,539) | (9,276)
Cash and cash equivalents at beginning of year | 222,280 |
Cash and cash equivalents at end of period | 200,741 |
Reportable Legal Entities | Guarantor Subsidiaries |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | (14,829) | 12,141
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired |  | (18,561)
Net proceeds from sale of property and equipment | 2,823 | 9,081
Purchases of property, plant, and equipment | (1,008) | (1,326)
Net cash provided by (used in) investing activities | 1,815 | (10,806)
Cash Flows from Financing Activities |  |
Purchase of treasury stock at market prices | 0 | 0
Net proceeds from issuance of common stock | 0 | 0
Intercompany financing | (6,660) | (6,398)
Net cash used in financing activities | (6,660) | (6,398)
Effect of exchange rate changes on cash | 0 | 0
Net decrease in cash and cash equivalents | (19,674) | (5,063)
Cash and cash equivalents at beginning of year | 192,604 |
Cash and cash equivalents at end of period | 172,930 |
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | (771) | (3,193)
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired |  | 0
Net proceeds from sale of property and equipment | 0 | 152
Purchases of property, plant, and equipment | (25) | (127)
Net cash provided by (used in) investing activities | (25) | 25
Cash Flows from Financing Activities |  |
Purchase of treasury stock at market prices | 0 | 0
Net proceeds from issuance of common stock | 0 | 0
Intercompany financing | (570) | (1,118)
Net cash used in financing activities | (570) | (1,118)
Effect of exchange rate changes on cash | (499) | 73
Net decrease in cash and cash equivalents | (1,865) | (4,213)
Cash and cash equivalents at beginning of year | 29,676 |
Cash and cash equivalents at end of period | 27,811 |
Reportable Legal Entities | Gibraltar Industries, Inc. |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | (6,606) | (6,605)
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 provided by (used in) investing activities | 0 | 0
Cash Flows from Financing Activities |  |
Purchase of treasury stock at market prices | (850) | (922)
Net proceeds from issuance of common stock | 226 | 11
Intercompany financing | 7,230 | 7,516
Net cash used in financing activities | 6,606 | 6,605
Effect of exchange rate changes on cash | 0 | 0
Net decrease 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 provided by (used in) investing activities | 0 | 0
Cash Flows from Financing Activities |  |
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 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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