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Supplemental Financial Information (Schedule of Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2017 | Sep. 30, 2016
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | $ 48,831 | $ 102,186
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired | (18,494) | (2,314)
Net proceeds from sale of property and equipment | 12,935 | 249
Purchases of property, plant, and equipment | (5,152) | (7,600)
Net proceeds from sale of business | 0 | 8,250
Other, net | 0 | 1,118
Net cash used in investing activities | (10,711) | (297)
Cash Flows from Financing Activities |  |
Long-term debt payments | 400 | 400
Purchase of treasury stock at market prices | (1,982) | (1,178)
Net proceeds from issuance of common stock | 649 | 2,892
Payment of debt issuance costs | 0 | (54)
Intercompany financing | 0 | 0
Net cash used in financing activities | (1,733) | 1,260
Effect of exchange rate changes on cash | 1,468 | 1,055
Net increase in cash and cash equivalents | 37,855 | 104,204
Cash and cash equivalents at beginning of year | 170,177 | 68,858
Cash and cash equivalents at end of period | 208,032 | 173,062
Reportable Legal Entities | Guarantor Subsidiaries |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 64,702 | 119,790
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired | (18,494) | (2,314)
Net proceeds from sale of property and equipment | 12,935 | 220
Purchases of property, plant, and equipment | (4,929) | (7,177)
Net proceeds from sale of business |  | 0
Other, net |  | 1,118
Net cash used in investing activities | (10,488) | (8,153)
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
Payment of debt issuance costs |  | (54)
Intercompany financing | (14,813) | (996)
Net cash used in financing activities | (15,213) | (1,450)
Effect of exchange rate changes on cash | 0 | 0
Net increase in cash and cash equivalents | 39,001 | 110,187
Cash and cash equivalents at beginning of year | 143,826 | 39,597
Cash and cash equivalents at end of period | 182,827 | 149,784
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | (735) | 16,582
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired | 0 | 0
Net proceeds from sale of property and equipment | 0 | 29
Purchases of property, plant, and equipment | (223) | (423)
Net proceeds from sale of business |  | 8,250
Other, net |  | 0
Net cash used in investing activities | (223) | 7,856
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
Payment of debt issuance costs |  | 0
Intercompany financing | (1,656) | (31,476)
Net cash used in financing activities | (1,656) | (31,476)
Effect of exchange rate changes on cash | 1,468 | 1,055
Net increase in cash and cash equivalents | (1,146) | (5,983)
Cash and cash equivalents at beginning of year | 26,351 | 29,261
Cash and cash equivalents at end of period | 25,205 | 23,278
Reportable Legal Entities | Gibraltar Industries, Inc. |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | (15,136) | (34,186)
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 proceeds from sale of business |  | 0
Other, net |  | 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 | (1,982) | (1,178)
Net proceeds from issuance of common stock | 649 | 2,892
Payment of debt issuance costs |  | 0
Intercompany financing | 16,469 | 32,472
Net cash used in financing activities | 15,136 | 34,186
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 | 0
Cash and cash equivalents at end of period | 0 | 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 proceeds from sale of business |  | 0
Other, net |  | 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
Payment of debt issuance costs |  | 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 | 0
Cash and cash equivalents at end of period | $ 0 | $ 0

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