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Supplemental Financial Information (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 15, 2016 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash (used in) provided by operating activities of continuing operations |  | $ 122,738 | $ 86,684 | $ 32,583
Net cash used in operating activities of discontinued operations |  | 0 | 0 | (41)
Net cash provided by operating activities |  | 122,738 | 86,684 | 32,542
Cash Flows from Investing Activities |  |  |  |
Other, net |  | 1,118 | 1,154 | 277
Purchases of property, plant, and equipment |  | (10,779) | (12,373) | (23,291)
Acquisitions, net of cash acquired |  | (23,412) | (140,621) | 0
Net proceeds from sale of property and equipment |  | 953 | 26,500 | 5,992
Net proceeds from sale of business | $ 8,300 | 8,250 | 0 | 0
Net cash used in investing activities |  | (23,870) | (125,340) | (17,022)
Cash Flows from Financing Activities |  |  |  |
Long-term debt payments |  | (400) | (73,642) | (407)
Proceeds from long-term debt |  | 0 | 73,242 | 0
Payment of debt issuance costs |  | (54) | (1,166) | (35)
Purchase of treasury stock at market prices |  | (1,539) | (956) | (575)
Intercompany financing |  | 0 | 0 | 0
Excess tax benefit from stock compensation |  | 1,249 | 537 | 100
Net proceeds from issuance of common stock |  | 3,341 | 1,801 | 595
Net cash provided by (used in) financing activities |  | 2,597 | (184) | (322)
Effect of exchange rate changes on cash |  | (146) | (2,912) | (1,627)
Net increase (decrease) in cash and cash equivalents |  | 101,319 | (41,752) | 13,571
Cash and cash equivalents at beginning of year |  | 68,858 | 110,610 | 97,039
Cash and cash equivalents at end of year |  | 170,177 | 68,858 | 110,610
Gibraltar Industries, Inc. |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash (used in) provided by operating activities of continuing operations |  |  |  | (13,437)
Net cash used in operating activities of discontinued operations |  |  |  | 0
Net cash provided by operating activities |  | (34,243) | (13,309) | (13,437)
Cash Flows from Investing Activities |  |  |  |
Other, net |  | 0 | 0 | 0
Purchases of property, plant, and equipment |  | 0 | 0 | 0
Acquisitions, net of cash acquired |  | 0 | 0 |
Net proceeds from sale of property and equipment |  | 0 | 0 | 0
Net proceeds from sale of business |  | 0 |  |
Net cash used in investing activities |  | 0 | 0 | 0
Cash Flows from Financing Activities |  |  |  |
Long-term debt payments |  | 0 | 0 | 0
Proceeds from long-term debt |  |  | 0 |
Payment of debt issuance costs |  | 0 | 0 | 0
Purchase of treasury stock at market prices |  | (1,539) | (956) | (575)
Intercompany financing |  | 31,192 | 11,927 | 13,317
Excess tax benefit from stock compensation |  | 1,249 | 537 | 100
Net proceeds from issuance of common stock |  | 3,341 | 1,801 | 595
Net cash provided by (used in) financing activities |  | 34,243 | 13,309 | 13,437
Effect of exchange rate changes on cash |  | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents |  | 0 | 0 | 0
Cash and cash equivalents at beginning of year |  | 0 | 0 | 0
Cash and cash equivalents at end of year |  | 0 | 0 | 0
Guarantor Subsidiaries |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash (used in) provided by operating activities of continuing operations |  |  |  | 40,820
Net cash used in operating activities of discontinued operations |  |  |  | (41)
Net cash provided by operating activities |  | 139,641 | 94,440 | 40,779
Cash Flows from Investing Activities |  |  |  |
Other, net |  | 1,118 | 1,154 | 277
Purchases of property, plant, and equipment |  | (10,321) | (11,754) | (19,286)
Acquisitions, net of cash acquired |  | (23,412) | (114,145) |
Net proceeds from sale of property and equipment |  | 230 | 26,500 | 5,989
Net proceeds from sale of business |  | 0 |  |
Net cash used in investing activities |  | (32,385) | (98,245) | (13,020)
Cash Flows from Financing Activities |  |  |  |
Long-term debt payments |  | (400) | (73,642) | (407)
Proceeds from long-term debt |  |  | 73,242 |
Payment of debt issuance costs |  | (54) | (1,166) | (35)
Purchase of treasury stock at market prices |  | 0 | 0 | 0
Intercompany financing |  | (2,573) | (46,498) | (11,707)
Excess tax benefit from stock compensation |  | 0 | 0 | 0
Net proceeds from issuance of common stock |  | 0 | 0 | 0
Net cash provided by (used in) financing activities |  | (3,027) | (48,064) | (12,149)
Effect of exchange rate changes on cash |  | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents |  | 104,229 | (51,869) | 15,610
Cash and cash equivalents at beginning of year |  | 39,597 | 91,466 | 75,856
Cash and cash equivalents at end of year |  | 143,826 | 39,597 | 91,466
Non-Guarantor Subsidiaries |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash (used in) provided by operating activities of continuing operations |  |  |  | 5,200
Net cash used in operating activities of discontinued operations |  |  |  | 0
Net cash provided by operating activities |  | 17,340 | 5,553 | 5,200
Cash Flows from Investing Activities |  |  |  |
Other, net |  | 0 | 0 | 0
Purchases of property, plant, and equipment |  | (458) | (619) | (4,005)
Acquisitions, net of cash acquired |  | 0 | (26,476) |
Net proceeds from sale of property and equipment |  | 723 | 0 | 3
Net proceeds from sale of business |  | 8,250 |  |
Net cash used in investing activities |  | 8,515 | (27,095) | (4,002)
Cash Flows from Financing Activities |  |  |  |
Long-term debt payments |  | 0 | 0 | 0
Proceeds from long-term debt |  |  | 0 |
Payment of debt issuance costs |  | 0 | 0 | 0
Purchase of treasury stock at market prices |  | 0 | 0 | 0
Intercompany financing |  | (28,619) | 34,571 | (1,610)
Excess tax benefit from stock compensation |  | 0 | 0 | 0
Net proceeds from issuance of common stock |  | 0 | 0 | 0
Net cash provided by (used in) financing activities |  | (28,619) | 34,571 | (1,610)
Effect of exchange rate changes on cash |  | (146) | (2,912) | (1,627)
Net increase (decrease) in cash and cash equivalents |  | (2,910) | 10,117 | (2,039)
Cash and cash equivalents at beginning of year |  | 29,261 | 19,144 | 21,183
Cash and cash equivalents at end of year |  | 26,351 | 29,261 | 19,144
Eliminations |  |  |  |
Condensed Cash Flow Statements, Captions [Line Items] |  |  |  |
Net cash (used in) provided by operating activities of continuing operations |  |  |  | 0
Net cash used in operating activities of discontinued operations |  |  |  | 0
Net cash provided by operating activities |  | 0 | 0 | 0
Cash Flows from Investing Activities |  |  |  |
Other, net |  | 0 | 0 | 0
Purchases of property, plant, and equipment |  | 0 | 0 | 0
Acquisitions, net of cash acquired |  | 0 | 0 |
Net proceeds from sale of property and equipment |  | 0 | 0 | 0
Net proceeds from sale of business |  | 0 |  |
Net cash used in investing activities |  | 0 | 0 | 0
Cash Flows from Financing Activities |  |  |  |
Long-term debt payments |  | 0 | 0 | 0
Proceeds from long-term debt |  |  | 0 |
Payment of debt issuance costs |  | 0 | 0 | 0
Purchase of treasury stock at market prices |  | 0 | 0 | 0
Intercompany financing |  | 0 | 0 | 0
Excess tax benefit from stock compensation |  | 0 | 0 | 0
Net proceeds from issuance of common stock |  | 0 | 0 | 0
Net cash provided by (used in) financing activities |  | 0 | 0 | 0
Effect of exchange rate changes on cash |  | 0 | 0 | 0
Net increase (decrease) in cash and cash equivalents |  | 0 | 0 | 0
Cash and cash equivalents at beginning of year |  | 0 | 0 | 0
Cash and cash equivalents at end of year |  | $ 0 | $ 0 | $ 0

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