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Supplemental Financial Information (Schedule of Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2016 | Sep. 30, 2015
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | $ 101,245 | $ 44,488
Cash Flows from Investing Activities |  |
Cash paid for acquisitions | (2,314) | (140,620)
Net proceeds from sale of property and equipment | 249 | 26,392
Purchases of property, plant, and equipment | (7,600) | (6,822)
Net proceeds from sale of business | 8,250 | 0
Other, net | 1,118 | 1,154
Net cash used in investing activities | (297) | (119,896)
Cash Flows from Financing Activities |  |
Purchase of treasury stock at market prices | (1,178) | (568)
Long-term debt payments | 400 | 47,592
Proceeds from long-term debt | 0 | 58,192
Net proceeds from issuance of common stock | 2,892 | 237
Payment of debt issuance costs | (54) | 0
Inter Company Financing | 0 | 0
Excess tax benefit from stock compensation | 941 | 0
Net cash used in financing activities | 2,201 | 10,269
Effect of exchange rate changes on cash | 1,055 | (2,140)
Net increase (decrease) in cash and cash equivalents | 104,204 | (67,279)
Cash and cash equivalents at beginning of year | 68,858 | 110,610
Cash and cash equivalents at end of period | 173,062 | 43,331
Reportable Legal Entities | Gibraltar Industries, Inc. |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | (34,186) | (13,231)
Cash Flows from Investing Activities |  |
Cash paid for acquisitions | 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 | 0
Net cash used in investing activities | 0 | 0
Cash Flows from Financing Activities |  |
Purchase of treasury stock at market prices | (1,178) | (568)
Long-term debt payments | 0 | 0
Proceeds from long-term debt |  | 0
Net proceeds from issuance of common stock | 2,892 | 237
Payment of debt issuance costs | 0 |
Inter Company Financing | 31,531 | 13,562
Excess tax benefit from stock compensation | 941 |
Net cash used in financing activities | 34,186 | 13,231
Effect of exchange rate changes on cash | 0 | 0
Net increase (decrease) 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
Reportable Legal Entities | Guarantor Subsidiaries |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 118,849 | 52,060
Cash Flows from Investing Activities |  |
Cash paid for acquisitions | (2,314) | (113,828)
Net proceeds from sale of property and equipment | 220 | 26,392
Purchases of property, plant, and equipment | (7,177) | (6,458)
Net proceeds from sale of business | 0 |
Other, net | 1,118 | 1,154
Net cash used in investing activities | (8,153) | (92,740)
Cash Flows from Financing Activities |  |
Purchase of treasury stock at market prices | 0 | 0
Long-term debt payments | 400 | 47,592
Proceeds from long-term debt |  | 58,192
Net proceeds from issuance of common stock | 0 | 0
Payment of debt issuance costs | (54) |
Inter Company Financing | (55) | (42,500)
Excess tax benefit from stock compensation | 0 |
Net cash used in financing activities | (509) | (31,900)
Effect of exchange rate changes on cash | 0 | 0
Net increase (decrease) in cash and cash equivalents | 110,187 | (72,580)
Cash and cash equivalents at beginning of year | 39,597 | 91,466
Cash and cash equivalents at end of period | 149,784 | 18,886
Reportable Legal Entities | Non-Guarantor Subsidiaries |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 16,582 | 5,659
Cash Flows from Investing Activities |  |
Cash paid for acquisitions | 0 | (26,792)
Net proceeds from sale of property and equipment | 29 | 0
Purchases of property, plant, and equipment | (423) | (364)
Net proceeds from sale of business | 8,250 |
Other, net | 0 | 0
Net cash used in investing activities | 7,856 | (27,156)
Cash Flows from Financing Activities |  |
Purchase of treasury stock at market prices | 0 | 0
Long-term debt payments | 0 | 0
Proceeds from long-term debt |  | 0
Net proceeds from issuance of common stock | 0 | 0
Payment of debt issuance costs | 0 |
Inter Company Financing | (31,476) | 28,938
Excess tax benefit from stock compensation | 0 |
Net cash used in financing activities | (31,476) | 28,938
Effect of exchange rate changes on cash | 1,055 | (2,140)
Net increase (decrease) in cash and cash equivalents | (5,983) | 5,301
Cash and cash equivalents at beginning of year | 29,261 | 19,144
Cash and cash equivalents at end of period | 23,278 | 24,445
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 | 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 | 0
Net cash used in investing activities | 0 | 0
Cash Flows from Financing Activities |  |
Purchase of treasury stock at market prices | 0 | 0
Long-term debt payments | 0 | 0
Proceeds from long-term debt |  | 0
Net proceeds from issuance of common stock | 0 | 0
Payment of debt issuance costs | 0 |
Inter Company Financing | 0 | 0
Excess tax benefit from stock compensation | 0 |
Net cash used in financing activities | 0 | 0
Effect of exchange rate changes on cash | 0 | 0
Net increase (decrease) 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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