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Supplemental Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Consolidating Statements of Operations | GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENT OF OPERATIONS YEAR ENDED DECEMBER 31, 2016 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Net sales | $ | — |  |  | $ | 950,945 |  |  | $ | 78,184 |  |  | $ | (21,148 | ) |  | $ | 1,007,981 |
Cost of sales | — |  |  | 722,315 |  |  | 62,729 |  |  | (21,825 | ) |  | 763,219 |
Gross profit | — |  |  | 228,630 |  |  | 15,455 |  |  | 677 |  |  | 244,762 |
Selling, general, and administrative expense | 14,302 |  |  | 137,343 |  |  | 9,454 |  |  | — |  |  | 161,099 |
Intangible asset impairment | — |  |  | 7,980 |  |  | 2,195 |  |  | — |  |  | 10,175 |
(Loss) income from operations | (14,302 | ) |  | 83,307 |  |  | 3,806 |  |  | 677 |  |  | 73,488 |
Interest expense (income) | 13,609 |  |  | 1,042 |  |  | (74 | ) |  | — |  |  | 14,577 |
Other expense (income) | 8,716 |  |  | 512 |  |  | (300 | ) |  | — |  |  | 8,928 |
(Loss) income before taxes | (36,627 | ) |  | 81,753 |  |  | 4,180 |  |  | 677 |  |  | 49,983 |
(Benefit of) provision for income taxes | (11,768 | ) |  | 27,551 |  |  | 481 |  |  | — |  |  | 16,264 |
(Loss) income from continuing operations | (24,859 | ) |  | 54,202 |  |  | 3,699 |  |  | 677 |  |  | 33,719 |
Discontinued operations: |  |  |  |  |  |  |  |  |
Loss before taxes | — |  |  | (70 | ) |  | — |  |  | — |  |  | (70 | )
Benefit of income taxes | — |  |  | (26 | ) |  | — |  |  | — |  |  | (26 | )
Loss from discontinued operations | — |  |  | (44 | ) |  | — |  |  | — |  |  | (44 | )
Equity in earnings from subsidiaries | 57,857 |  |  | 3,699 |  |  | — |  |  | (61,556 | ) |  | — |
Net income | $ | 32,998 |  |  | $ | 57,857 |  |  | $ | 3,699 |  |  | $ | (60,879 | ) |  | $ | 33,675 |
GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENT OF OPERATIONS YEAR ENDED DECEMBER 31, 2015 (in thousands)
Consolidated Statements of Comprehensive Income | GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Year ended December 31, 2017 |  |  |  |  |  |  |  |  |
Net income (loss) | $ | 63,584 |  |  | $ | 72,261 |  |  | $ | (943 | ) |  | $ | (72,342 | ) |  | $ | 62,560 |
Other comprehensive income: |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | — |  |  | — |  |  | 3,150 |  |  | — |  |  | 3,150 |
Adjustment to retirement benefit liability, net of tax | — |  |  | (9 | ) |  | — |  |  | — |  |  | (9 | )
Adjustment to post-retirement healthcare benefit liability, net of tax | — |  |  | 214 |  |  | — |  |  | — |  |  | 214 |
Other comprehensive income | — |  |  | 205 |  |  | 3,150 |  |  | — |  |  | 3,355 |
Total comprehensive income | $ | 63,584 |  |  | $ | 72,466 |  |  | $ | 2,207 |  |  | $ | (72,342 | ) |  | $ | 65,915 |
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Year ended December 31, 2016 |  |  |  |  |  |  |  |  |
Net income | $ | 32,998 |  |  | $ | 57,857 |  |  | $ | 3,699 |  |  | $ | (60,879 | ) |  | $ | 33,675 |
Other comprehensive income: |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | — |  |  | — |  |  | 6,945 |  |  | — |  |  | 6,945 |
Adjustment to retirement benefit liability, net of tax | — |  |  | 55 |  |  | — |  |  | — |  |  | 55 |
Adjustment to post-retirement healthcare benefit liability, net of tax | — |  |  | 695 |  |  | — |  |  | — |  |  | 695 |
Other comprehensive income | — |  |  | 750 |  |  | 6,945 |  |  | — |  |  | 7,695 |
Total comprehensive income | $ | 32,998 |  |  | $ | 58,607 |  |  | $ | 10,644 |  |  | $ | (60,879 | ) |  | $ | 41,370 |
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Year ended December 31, 2015 |  |  |  |  |  |  |  |  |
Net income (loss) | $ | 27,036 |  |  | $ | 36,401 |  |  | $ | (1,213 | ) |  | $ | (38,776 | ) |  | $ | 23,448 |
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | — |  |  | — |  |  | (6,228 | ) |  | — |  |  | (6,228 | )
Adjustment to retirement benefit liability, net of tax | — |  |  | 34 |  |  | 15 |  |  | — |  |  | 49 |
Adjustment to post-retirement healthcare benefit liability, net of tax | — |  |  | 171 |  |  | — |  |  | — |  |  | 171 |
Unrealized loss on cash flow hedges, net of tax | — |  |  | 143 |  |  | — |  |  | — |  |  | 143 |
Other comprehensive income (loss) | — |  |  | 348 |  |  | (6,213 | ) |  | — |  |  | (5,865 | )
Total comprehensive income (loss) | $ | 27,036 |  |  | $ | 36,749 |  |  | $ | (7,426 | ) |  | $ | (38,776 | ) |  | $ | 17,583 |
Consolidating Balance Sheets | GIBRALTAR INDUSTRIES, INC. CONSOLIDATING BALANCE SHEET DECEMBER 31, 2017 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Assets |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | 192,604 |  |  | $ | 29,676 |  |  | $ | — |  |  | $ | 222,280 |
Accounts receivable, net | — |  |  | 138,903 |  |  | 6,482 |  |  | — |  |  | 145,385 |
Intercompany balances | 324 |  |  | 4,166 |  |  | (4,490 | ) |  | — |  |  | — |
Inventories | — |  |  | 82,457 |  |  | 3,915 |  |  | — |  |  | 86,372 |
Other current assets | 5,415 |  |  | (368 | ) |  | 3,680 |  |  | — |  |  | 8,727 |
Total current assets | 5,739 |  |  | 417,762 |  |  | 39,263 |  |  | — |  |  | 462,764 |
Property, plant, and equipment, net | — |  |  | 93,906 |  |  | 3,192 |  |  | — |  |  | 97,098 |
Goodwill | — |  |  | 298,258 |  |  | 22,816 |  |  | — |  |  | 321,074 |
Acquired intangibles | — |  |  | 97,171 |  |  | 8,597 |  |  | — |  |  | 105,768 |
Other assets | — |  |  | 4,681 |  |  | — |  |  | — |  |  | 4,681 |
Investment in subsidiaries | 739,970 |  |  | 61,746 |  |  | — |  |  | (801,716 | ) |  | — |
| $ | 745,709 |  |  | $ | 973,524 |  |  | $ | 73,868 |  |  | $ | (801,716 | ) |  | $ | 991,385 |
Liabilities and Shareholders’ Equity |  |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |
Accounts payable | $ | — |  |  | $ | 77,786 |  |  | $ | 4,601 |  |  | $ | — |  |  | $ | 82,387 |
Accrued expenses | 5,469 |  |  | 67,746 |  |  | 2,252 |  |  | — |  |  | 75,467 |
Billings in excess of cost | — |  |  | 9,840 |  |  | 2,939 |  |  | — |  |  | 12,779 |
Current maturities of long-term debt | — |  |  | 400 |  |  | — |  |  | — |  |  | 400 |
Total current liabilities | 5,469 |  |  | 155,772 |  |  | 9,792 |  |  | — |  |  | 171,033 |
Long-term debt | 208,521 |  |  | 1,100 |  |  | — |  |  | — |  |  | 209,621 |
Deferred income taxes | — |  |  | 28,907 |  |  | 2,330 |  |  | — |  |  | 31,237 |
Other non-current liabilities | — |  |  | 47,775 |  |  | — |  |  | — |  |  | 47,775 |
Shareholders’ equity | 531,719 |  |  | 739,970 |  |  | 61,746 |  |  | (801,716 | ) |  | 531,719 |
| $ | 745,709 |  |  | $ | 973,524 |  |  | $ | 73,868 |  |  | $ | (801,716 | ) |  | $ | 991,385 |
GIBRALTAR INDUSTRIES, INC. CONSOLIDATING BALANCE SHEET DECEMBER 31, 2016 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Assets |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | 143,826 |  |  | $ | 26,351 |  |  | $ | — |  |  | $ | 170,177 |
Accounts receivable, net | — |  |  | 117,526 |  |  | 6,546 |  |  | — |  |  | 124,072 |
Intercompany balances | (615 | ) |  | 6,152 |  |  | (5,537 | ) |  | — |  |  | — |
Inventories | — |  |  | 85,483 |  |  | 4,129 |  |  | — |  |  | 89,612 |
Other current assets | 13,783 |  |  | (10,070 | ) |  | 3,623 |  |  | — |  |  | 7,336 |
Total current assets | 13,168 |  |  | 342,917 |  |  | 35,112 |  |  | — |  |  | 391,197 |
Property, plant, and equipment, net | — |  |  | 104,642 |  |  | 3,662 |  |  | — |  |  | 108,304 |
Goodwill | — |  |  | 282,300 |  |  | 21,732 |  |  | — |  |  | 304,032 |
Acquired intangibles | — |  |  | 101,520 |  |  | 9,270 |  |  | — |  |  | 110,790 |
Other assets | — |  |  | 3,922 |  |  | — |  |  | — |  |  | 3,922 |
Investment in subsidiaries | 663,118 |  |  | 58,477 |  |  | — |  |  | (721,595 | ) |  | — |
| $ | 676,286 |  |  | $ | 893,778 |  |  | $ | 69,776 |  |  | $ | (721,595 | ) |  | $ | 918,245 |
Liabilities and Shareholders’ Equity |  |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |
Accounts payable | $ | — |  |  | $ | 66,363 |  |  | $ | 3,581 |  |  | $ | — |  |  | $ | 69,944 |
Accrued expenses | 7,369 |  |  | 60,004 |  |  | 3,019 |  |  | — |  |  | 70,392 |
Billings in excess of cost | — |  |  | 9,301 |  |  | 2,051 |  |  | — |  |  | 11,352 |
Current maturities of long-term debt | — |  |  | 400 |  |  | — |  |  | — |  |  | 400 |
Total current liabilities | 7,369 |  |  | 136,068 |  |  | 8,651 |  |  | — |  |  | 152,088 |
Long-term debt | 208,037 |  |  | 1,200 |  |  | — |  |  | — |  |  | 209,237 |
Deferred income taxes | — |  |  | 35,354 |  |  | 2,648 |  |  | — |  |  | 38,002 |
Other non-current liabilities | — |  |  | 58,038 |  |  | — |  |  | — |  |  | 58,038 |
Shareholders’ equity | 460,880 |  |  | 663,118 |  |  | 58,477 |  |  | (721,595 | ) |  | 460,880 |
| $ | 676,286 |  |  | $ | 893,778 |  |  | $ | 69,776 |  |  | $ | (721,595 | ) |  | $ | 918,245 |
Condensed Consolidating Statements of Cash Flows | GIBRALTAR INDUSTRIES, INC. CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS DECEMBER 31, 2017 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |
Net cash (used in) provided by operating activities | $ | (15,172 | ) |  | $ | 83,114 |  |  | $ | 2,128 |  |  | $ | — |  |  | $ | 70,070 |
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |
Purchases of property, plant, and equipment | — |  |  | (11,026 | ) |  | (373 | ) |  | — |  |  | (11,399 | )
Acquisitions, net of cash acquired | — |  |  | (18,494 | ) |  | — |  |  | — |  |  | (18,494 | )
Net proceeds from sale of property and equipment | — |  |  | 12,905 |  |  | 191 |  |  | — |  |  | 13,096 |
Net cash used in investing activities | — |  |  | (16,615 | ) |  | (182 | ) |  | — |  |  | (16,797 | )
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |
Long-term debt payments | — |  |  | (400 | ) |  | — |  |  | — |  |  | (400 | )
Purchase of treasury stock at market prices | (2,872 | ) |  | — |  |  | — |  |  | — |  |  | (2,872 | )
Intercompany financing | 17,370 |  |  | (17,321 | ) |  | (49 | ) |  | — |  |  | — |
Net proceeds from issuance of common stock | 674 |  |  | — |  |  | — |  |  | — |  |  | 674 |
Net cash provided by (used in) financing activities | 15,172 |  |  | (17,721 | ) |  | (49 | ) |  | — |  |  | (2,598 | )
Effect of exchange rate changes on cash | — |  |  | — |  |  | 1,428 |  |  | — |  |  | 1,428 |
Net increase in cash and cash equivalents | — |  |  | 48,778 |  |  | 3,325 |  |  | — |  |  | 52,103 |
Cash and cash equivalents at beginning of year | — |  |  | 143,826 |  |  | 26,351 |  |  | — |  |  | 170,177 |
Cash and cash equivalents at end of year | $ | — |  |  | $ | 192,604 |  |  | $ | 29,676 |  |  | $ | — |  |  | $ | 222,280 |
GIBRALTAR INDUSTRIES, INC. CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS DECEMBER 31, 2016 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |
Net cash (used in) provided by operating activities | $ | (34,243 | ) |  | $ | 140,890 |  |  | $ | 17,340 |  |  | $ | — |  |  | $ | 123,987 |
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |
Purchases of property, plant, and equipment | — |  |  | (10,321 | ) |  | (458 | ) |  | — |  |  | (10,779 | )
Acquisitions, net of cash acquired | — |  |  | (23,412 | ) |  | — |  |  | — |  |  | (23,412 | )
Net proceeds from sale of property and equipment | — |  |  | 230 |  |  | 723 |  |  | — |  |  | 953 |
Net proceeds from sale of business | — |  |  | — |  |  | 8,250 |  |  | — |  |  | 8,250 |
Other, net | — |  |  | 1,118 |  |  | — |  |  | — |  |  | 1,118 |
Net cash (used in) provided by investing activities | — |  |  | (32,385 | ) |  | 8,515 |  |  | — |  |  | (23,870 | )
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |
Long-term debt payments | — |  |  | (400 | ) |  | — |  |  | — |  |  | (400 | )
Payment of debt issuance costs | — |  |  | (54 | ) |  | — |  |  | — |  |  | (54 | )
Purchase of treasury stock at market prices | (1,539 | ) |  | — |  |  | — |  |  | — |  |  | (1,539 | )
Intercompany financing | 32,441 |  |  | (3,822 | ) |  | (28,619 | ) |  | — |  |  | — |
Net proceeds from issuance of common stock | 3,341 |  |  | — |  |  | — |  |  | — |  |  | 3,341 |
Net cash provided by (used in) financing activities | 34,243 |  |  | (4,276 | ) |  | (28,619 | ) |  | — |  |  | 1,348 |
Effect of exchange rate changes on cash | — |  |  | — |  |  | (146 | ) |  | — |  |  | (146 | )
Net increase (decrease) in cash and cash equivalents | — |  |  | 104,229 |  |  | (2,910 | ) |  | — |  |  | 101,319 |
Cash and cash equivalents at beginning of year | — |  |  | 39,597 |  |  | 29,261 |  |  | — |  |  | 68,858 |
Cash and cash equivalents at end of year | $ | — |  |  | $ | 143,826 |  |  | $ | 26,351 |  |  | $ | — |  |  | $ | 170,177 |
GIBRALTAR INDUSTRIES, INC. CONDENSED CONSOLIDATING STATEMENT OF CASH FLOWS DECEMBER 31, 2015 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Cash Flows from Operating Activities |  |  |  |  |  |  |  |  |
Net cash (used in) provided by operating activities | $ | (13,309 | ) |  | $ | 94,977 |  |  | $ | 5,553 |  |  | $ | — |  |  | $ | 87,221 |
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |
Purchases of property, plant, and equipment | — |  |  | (11,754 | ) |  | (619 | ) |  | — |  |  | (12,373 | )
Acquisitions, net of cash acquired | — |  |  | (114,145 | ) |  | (26,476 | ) |  | — |  |  | (140,621 | )
Net proceeds from sale of property and equipment | — |  |  | 26,500 |  |  | — |  |  | — |  |  | 26,500 |
Other, net | — |  |  | 1,154 |  |  |  |  |  |  | 1,154 |
Net cash used in investing activities | — |  |  | (98,245 | ) |  | (27,095 | ) |  | — |  |  | (125,340 | )
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |
Long-term debt payments | — |  |  | (73,642 | ) |  | — |  |  | — |  |  | (73,642 | )
Proceeds from long-term debt | — |  |  | 73,242 |  |  |  |  |  |  | 73,242 |
Payment of debt issuance costs | — |  |  | (1,166 | ) |  | — |  |  | — |  |  | (1,166 | )
Purchase of treasury stock at market prices | (956 | ) |  | — |  |  | — |  |  | — |  |  | (956 | )
Intercompany financing | 12,464 |  |  | (47,035 | ) |  | 34,571 |  |  | — |  |  | — |
Net proceeds from issuance of common stock | 1,801 |  |  | — |  |  | — |  |  | — |  |  | 1,801 |
Net cash provided by (used in) financing activities | 13,309 |  |  | (48,601 | ) |  | 34,571 |  |  | — |  |  | (721 | )
Effect of exchange rate changes on cash | — |  |  | — |  |  | (2,912 | ) |  | — |  |  | (2,912 | )
Net (decrease) increase in cash and cash equivalents | — |  |  | (51,869 | ) |  | 10,117 |  |  | — |  |  | (41,752 | )
Cash and cash equivalents at beginning of year | — |  |  | 91,466 |  |  | 19,144 |  |  | — |  |  | 110,610 |
Cash and cash equivalents at end of year | $ | — |  |  | $ | 39,597 |  |  | $ | 29,261 |  |  | $ | — |  |  | $ | 68,858 |

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