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Supplemental Financial Information (Schedule of Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2018 | Sep. 30, 2017
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | $ 38,210 | $ 48,831
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired | (5,241) | (18,494)
Net proceeds from sale of property and equipment | 3,147 | 12,935
Purchases of property, plant, and equipment | (6,767) | (5,152)
Net cash used in investing activities | (8,861) | (10,711)
Cash Flows from Financing Activities |  |
Long-term debt payments | (400) | (400)
Purchase of treasury stock at market prices | (6,549) | (1,982)
Net proceeds from issuance of common stock | 1,343 | 649
Intercompany financing | 0 | 0
Net cash used in financing activities | (5,606) | (1,733)
Effect of exchange rate changes on cash | (610) | 1,468
Net increase in cash and cash equivalents | 23,133 | 37,855
Cash and cash equivalents at beginning of year | 222,280 | 170,177
Cash and cash equivalents at end of period | 245,413 | 208,032
Reportable Legal Entities | Guarantor Subsidiaries |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 47,971 | 64,702
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired | (5,241) | (18,494)
Net proceeds from sale of property and equipment | 3,044 | 12,935
Purchases of property, plant, and equipment | (6,537) | (4,929)
Net cash used in investing activities | (8,734) | (10,488)
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 | (17,474) | (14,813)
Net cash used in financing activities | (17,874) | (15,213)
Effect of exchange rate changes on cash | 0 | 0
Net increase in cash and cash equivalents | 21,363 | 39,001
Cash and cash equivalents at beginning of year | 192,604 |
Cash and cash equivalents at end of period | 213,967 |
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 3,479 | (735)
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired | 0 | 0
Net proceeds from sale of property and equipment | 103 | 0
Purchases of property, plant, and equipment | (230) | (223)
Net cash used in investing activities | (127) | (223)
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 | (972) | (1,656)
Net cash used in financing activities | (972) | (1,656)
Effect of exchange rate changes on cash | (610) | 1,468
Net increase in cash and cash equivalents | 1,770 | (1,146)
Cash and cash equivalents at beginning of year | 29,676 |
Cash and cash equivalents at end of period | 31,446 |
Reportable Legal Entities | Gibraltar Industries, Inc. |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | (13,240) | (15,136)
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired | 0 | 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 | (6,549) | (1,982)
Net proceeds from issuance of common stock | 1,343 | 649
Intercompany financing | 18,446 | 16,469
Net cash used in financing activities | 13,240 | 15,136
Effect of exchange rate changes on cash | 0 | 0
Net 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 | 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 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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