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Supplemental Financial Information (Schedule of Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2017 | Jun. 30, 2016
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | $ 21,720 | $ 49,441
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 | 12,778 | 162
Purchases of property, plant, and equipment | (3,274) | (4,035)
Net proceeds from sale of business | 0 | 8,479
Other, net | 0 | 1,118
Net cash (used in) provided by investing activities | (8,990) | 3,410
Cash Flows from Financing Activities |  |
Long-term debt payments | 400 | 400
Payment of debt issuance costs |  | 54
Purchase of treasury stock at market prices | (1,003) | (462)
Net proceeds from issuance of common stock | 247 | 2,057
Payment of debt issuance costs | 0 | (54)
Intercompany financing | 0 | 0
Net cash used in financing activities | (1,156) | 1,141
Effect of exchange rate changes on cash | 628 | 1,264
Net increase in cash and cash equivalents | 12,202 | 55,256
Cash and cash equivalents at beginning of year | 170,177 | 68,858
Cash and cash equivalents at end of period | 182,379 | 124,114
Guarantor Subsidiaries |  |
Cash Flows from Financing Activities |  |
Purchase of treasury stock at market prices |  | 0
Non-Guarantor Subsidiaries |  |
Cash Flows from Financing Activities |  |
Purchase of treasury stock at market prices |  | 0
Reportable Legal Entities | Guarantor Subsidiaries |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 31,687 | 62,474
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 | 12,627 | 133
Purchases of property, plant, and equipment | (3,123) | (3,852)
Net proceeds from sale of business |  | 0
Other, net |  | 1,118
Net cash (used in) provided by investing activities | (8,990) | (4,915)
Cash Flows from Financing Activities |  |
Long-term debt payments | 400 | 400
Payment of debt issuance costs |  | 54
Purchase of treasury stock at market prices | 0 |
Net proceeds from issuance of common stock | 0 | 0
Intercompany financing | (7,280) | 4,060
Net cash used in financing activities | (7,680) | 3,606
Effect of exchange rate changes on cash | 0 | 0
Net increase in cash and cash equivalents | 15,017 | 61,165
Cash and cash equivalents at beginning of year | 143,826 | 39,597
Cash and cash equivalents at end of period | 158,843 | 100,762
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | (3,327) | 14,263
Cash Flows from Investing Activities |  |
Cash paid for acquisitions, net of cash acquired | 0 | 0
Net proceeds from sale of property and equipment | 151 | 29
Purchases of property, plant, and equipment | (151) | (183)
Net proceeds from sale of business |  | 8,479
Other, net |  | 0
Net cash (used in) provided by investing activities | 0 | 8,325
Cash Flows from Financing Activities |  |
Long-term debt payments | 0 | 0
Payment of debt issuance costs |  | 0
Purchase of treasury stock at market prices | 0 |
Net proceeds from issuance of common stock | 0 | 0
Intercompany financing | (116) | (29,761)
Net cash used in financing activities | (116) | (29,761)
Effect of exchange rate changes on cash | 628 | 1,264
Net increase in cash and cash equivalents | (2,815) | (5,909)
Cash and cash equivalents at beginning of year | 26,351 | 29,261
Cash and cash equivalents at end of period | 23,536 | 23,352
Reportable Legal Entities | Gibraltar Industries, Inc. |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | (6,640) | (27,296)
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) provided by investing activities | 0 | 0
Cash Flows from Financing Activities |  |
Long-term debt payments | 0 | 0
Payment of debt issuance costs |  | 0
Purchase of treasury stock at market prices | (1,003) | (462)
Net proceeds from issuance of common stock | 247 | 2,057
Intercompany financing | 7,396 | 25,701
Net cash used in financing activities | 6,640 | 27,296
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) provided by investing activities | 0 | 0
Cash Flows from Financing Activities |  |
Long-term debt payments | 0 | 0
Payment of debt issuance costs |  | 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 | 0
Cash and cash equivalents at end of period | $ 0 | $ 0

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