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Supplemental Financial Information (Schedule of Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | $ 11,758 | $ (3,785)
Cash paid for acquisitions | (134,318) | 0
Purchases of property, plant, and equipment | (4,624) | (11,498)
Other investing activities | 1,154 | 121
Net proceeds from sale of property and equipment | 26,181 | 5,950
Net cash used in investing activities | (111,607) | (5,427)
Long-term debt payments | (11,792) | (407)
Proceeds from long-term debt | 41,392 | 0
Purchase of treasury stock at market prices | (387) | (408)
Net proceeds from issuance of common stock | 180 | 404
Intercompany financing | 0 | 0
Excess tax benefit from stock compensation | 37 | 81
Net cash provided by (used in) financing activities | 29,430 | (330)
Effect of exchange rate changes on cash | (769) | 260
Net decrease in cash and cash equivalents | (71,188) | (9,282)
Cash and cash equivalents at beginning of year | 110,610 | 97,039
Cash and cash equivalents at end of period | 39,422 |
Gibraltar Industries, Inc. |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | (6,621) | (6,664)
Cash paid for acquisitions | 0 |
Purchases of property, plant, and equipment | 0 | 0
Other investing activities | 0 | 0
Net proceeds from sale of property and equipment | 0 | 0
Net cash used in investing activities | 0 | 0
Long-term debt payments | 0 | 0
Proceeds from long-term debt | 0 |
Purchase of treasury stock at market prices | (387) | (408)
Net proceeds from issuance of common stock | 180 | 404
Intercompany financing | 6,791 | 6,587
Excess tax benefit from stock compensation | 37 | 81
Net cash provided by (used in) financing activities | 6,621 | 6,664
Effect of exchange rate changes on cash | 0 | 0
Net 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 |
Guarantor Subsidiaries |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 16,091 | 272
Cash paid for acquisitions | (106,055) |
Purchases of property, plant, and equipment | (4,307) | (9,232)
Other investing activities | 1,154 | 121
Net proceeds from sale of property and equipment | 26,181 | 5,947
Net cash used in investing activities | (83,027) | (3,164)
Long-term debt payments | (11,792) | (407)
Proceeds from long-term debt | 41,392 |
Purchase of treasury stock at market prices | 0 | 0
Net proceeds from issuance of common stock | 0 | 0
Intercompany financing | (36,970) | (6,028)
Excess tax benefit from stock compensation | 0 | 0
Net cash provided by (used in) financing activities | (7,370) | (6,435)
Effect of exchange rate changes on cash | 0 | 0
Net decrease in cash and cash equivalents | (74,306) | (9,327)
Cash and cash equivalents at beginning of year | 91,466 | 75,856
Cash and cash equivalents at end of period | 17,160 |
Non-Guarantor Subsidiaries |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 2,288 | 2,607
Cash paid for acquisitions | (28,263) |
Purchases of property, plant, and equipment | (317) | (2,266)
Other investing activities | 0 | 0
Net proceeds from sale of property and equipment | 0 | 3
Net cash used in investing activities | (28,580) | (2,263)
Long-term debt payments | 0 | 0
Proceeds from long-term debt | 0 |
Purchase of treasury stock at market prices | 0 | 0
Net proceeds from issuance of common stock | 0 | 0
Intercompany financing | 30,179 | (559)
Excess tax benefit from stock compensation | 0 | 0
Net cash provided by (used in) financing activities | 30,179 | (559)
Effect of exchange rate changes on cash | (769) | 260
Net decrease in cash and cash equivalents | 3,118 | 45
Cash and cash equivalents at beginning of year | 19,144 | 21,183
Cash and cash equivalents at end of period | 22,262 |
Eliminations |  |
Schedule Of Supplemental Financial Information [Line Items] |  |
Net cash provided by (used in) operating activities | 0 | 0
Cash paid for acquisitions | 0 |
Purchases of property, plant, and equipment | 0 | 0
Other investing activities | 0 | 0
Net proceeds from sale of property and equipment | 0 | 0
Net cash used in investing activities | 0 | 0
Long-term debt payments | 0 | 0
Proceeds from long-term debt | 0 |
Purchase of treasury stock at market prices | 0 | 0
Net proceeds from issuance of common stock | 0 | 0
Intercompany financing | 0 | 0
Excess tax benefit from stock compensation | 0 | 0
Net cash provided by (used in) financing activities | 0 | 0
Effect of exchange rate changes on cash | 0 | 0
Net 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 |

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