XML 50 R38.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Supplemental Financial Information (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2017
Condensed Financial Information of Parent Company Only Disclosure [Abstract] |
Schedule Of Consolidating Statements Of Operations | GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF OPERATIONS THREE MONTHS ENDED JUNE 30, 2017 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Net sales | $ | — |  |  | $ | 238,652 |  |  | $ | 10,627 |  |  | $ | (1,652 | ) |  | $ | 247,627 |
Cost of sales | — |  |  | 178,779 |  |  | 8,739 |  |  | (1,716 | ) |  | 185,802 |
Gross profit | — |  |  | 59,873 |  |  | 1,888 |  |  | 64 |  |  | 61,825 |
Selling, general, and administrative expense | 34 |  |  | 33,681 |  |  | 3,180 |  |  | — |  |  | 36,895 |
(Loss) income from operations | (34 | ) |  | 26,192 |  |  | (1,292 | ) |  | 64 |  |  | 24,930 |
Interest expense (income) | 3,403 |  |  | 162 |  |  | (15 | ) |  | — |  |  | 3,550 |
Other expense | — |  |  | 115 |  |  | 238 |  |  | — |  |  | 353 |
(Loss) income before taxes | (3,437 | ) |  | 25,915 |  |  | (1,515 | ) |  | 64 |  |  | 21,027 |
(Benefit of) provision for income taxes | (1,340 | ) |  | 9,360 |  |  | (167 | ) |  | — |  |  | 7,853 |
(Loss) income from continuing operations | (2,097 | ) |  | 16,555 |  |  | (1,348 | ) |  | 64 |  |  | 13,174 |
Discontinued operations: |  |  |  |  |  |  |  |  |
Loss from discontinued operations before taxes | — |  |  | (644 | ) |  | — |  |  | — |  |  | (644 | )
Benefit of income taxes | — |  |  | (239 | ) |  | — |  |  | — |  |  | (239 | )
Loss from discontinued operations | — |  |  | (405 | ) |  | — |  |  | — |  |  | (405 | )
Equity in earnings (loss) from subsidiaries | 14,802 |  |  | (1,348 | ) |  | — |  |  | (13,454 | ) |  | — |
Net income (loss) | $ | 12,705 |  |  | $ | 14,802 |  |  | $ | (1,348 | ) |  | $ | (13,390 | ) |  | $ | 12,769 |
GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF OPERATIONS THREE MONTHS ENDED JUNE 30, 2016 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Net sales | $ | — |  |  | $ | 247,912 |  |  | $ | 19,922 |  |  | $ | (2,096 | ) |  | $ | 265,738 |
Cost of sales | — |  |  | 183,557 |  |  | 15,075 |  |  | (1,737 | ) |  | 196,895 |
Gross profit | — |  |  | 64,355 |  |  | 4,847 |  |  | (359 | ) |  | 68,843 |
Selling, general, and administrative expense | 14,134 |  |  | 29,206 |  |  | (3,073 | ) |  | — |  |  | 40,267 |
(Loss) income from operations | (14,134 | ) |  | 35,149 |  |  | 7,920 |  |  | (359 | ) |  | 28,576 |
Interest expense (income) | 3,401 |  |  | 285 |  |  | (20 | ) |  | — |  |  | 3,666 |
Other expense (income) | 8,533 |  |  | 225 |  |  | (563 | ) |  | — |  |  | 8,195 |
(Loss) income before taxes | (26,068 | ) |  | 34,639 |  |  | 8,503 |  |  | (359 | ) |  | 16,715 |
(Benefit of) provision for income taxes | (8,275 | ) |  | 5,293 |  |  | 1,085 |  |  | — |  |  | (1,897 | )
Equity in earnings from subsidiaries | 36,764 |  |  | 7,418 |  |  | — |  |  | (44,182 | ) |  | — |
Net income | $ | 18,971 |  |  | $ | 36,764 |  |  | $ | 7,418 |  |  | $ | (44,541 | ) |  | $ | 18,612 |
GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF OPERATIONS SIX MONTHS ENDED JUNE 30, 2017 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Net sales | $ | — |  |  | $ | 436,400 |  |  | $ | 21,869 |  |  | $ | (4,037 | ) |  | $ | 454,232 |
Cost of sales | — |  |  | 329,286 |  |  | 17,721 |  |  | (3,855 | ) |  | 343,152 |
Gross profit | — |  |  | 107,114 |  |  | 4,148 |  |  | (182 | ) |  | 111,080 |
Selling, general, and administrative expense | 77 |  |  | 70,187 |  |  | 6,207 |  |  | — |  |  | 76,471 |
(Loss) income from operations | (77 | ) |  | 36,927 |  |  | (2,059 | ) |  | (182 | ) |  | 34,609 |
Interest expense (income) | 6,805 |  |  | 354 |  |  | (33 | ) |  | — |  |  | 7,126 |
Other expense | — |  |  | 245 |  |  | 162 |  |  | — |  |  | 407 |
(Loss) income before taxes | (6,882 | ) |  | 36,328 |  |  | (2,188 | ) |  | (182 | ) |  | 27,076 |
(Benefit of) provision for income taxes | (2,684 | ) |  | 12,738 |  |  | (148 | ) |  | — |  |  | 9,906 |
(Loss) income from continuing operations | (4,198 | ) |  | 23,590 |  |  | (2,040 | ) |  | (182 | ) |  | 17,170 |
Discontinued operations: |  |  |  |  |  |  |  |  |
Loss from discontinued operations before taxes | — |  |  | (644 | ) |  | — |  |  | — |  |  | (644 | )
Benefit of income taxes | — |  |  | (239 | ) |  | — |  |  | — |  |  | (239 | )
Loss from discontinued operations | — |  |  | (405 | ) |  | — |  |  | — |  |  | (405 | )
Equity in earnings (loss) from subsidiaries | 21,145 |  |  | (2,040 | ) |  | — |  |  | (19,105 | ) |  | — |
Net income (loss) | $ | 16,947 |  |  | $ | 21,145 |  |  | $ | (2,040 | ) |  | $ | (19,287 | ) |  | $ | 16,765 |
GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF OPERATIONS SIX MONTHS ENDED JUNE 30, 2016 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Net sales | $ | — |  |  | $ | 463,125 |  |  | $ | 47,215 |  |  | $ | (6,931 | ) |  | $ | 503,409 |
Cost of sales | — |  |  | 348,996 |  |  | 37,715 |  |  | (6,295 | ) |  | 380,416 |
Gross profit | — |  |  | 114,129 |  |  | 9,500 |  |  | (636 | ) |  | 122,993 |
Selling, general, and administrative expense | 14,174 |  |  | 61,117 |  |  | 1,365 |  |  | — |  |  | 76,656 |
(Loss) income from operations | (14,174 | ) |  | 53,012 |  |  | 8,135 |  |  | (636 | ) |  | 46,337 |
Interest expense (income) | 6,804 |  |  | 595 |  |  | (42 | ) |  | — |  |  | 7,357 |
Other expense (income) | 8,487 |  |  | 441 |  |  | (768 | ) |  | — |  |  | 8,160 |
(Loss) income before taxes | (29,465 | ) |  | 51,976 |  |  | 8,945 |  |  | (636 | ) |  | 30,820 |
(Benefit of) provision for income taxes | (9,482 | ) |  | 11,385 |  |  | 1,276 |  |  | — |  |  | 3,179 |
Equity in earnings from subsidiaries | 48,260 |  |  | 7,669 |  |  | — |  |  | (55,929 | ) |  | — |
Net income | $ | 28,277 |  |  | $ | 48,260 |  |  | $ | 7,669 |  |  | $ | (56,565 | ) |  | $ | 27,641 |
Schedule Of Consolidating Statements Of Comprehensive Income | IBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME THREE MONTHS ENDED JUNE 30, 2017 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Net income (loss) | $ | 12,705 |  |  | $ | 14,802 |  |  | $ | (1,348 | ) |  | $ | (13,390 | ) |  | $ | 12,769 |
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | — |  |  | — |  |  | 1,091 |  |  | — |  |  | 1,091 |
Adjustment to retirement benefit liability, net of tax | — |  |  | (3 | ) |  | — |  |  | — |  |  | (3 | )
Adjustment to post employment health care benefit liability, net of tax | — |  |  | 30 |  |  | — |  |  | — |  |  | 30 |
Other comprehensive income | — |  |  | 27 |  |  | 1,091 |  |  | — |  |  | 1,118 |
Total comprehensive income (loss) | $ | 12,705 |  |  | $ | 14,829 |  |  | $ | (257 | ) |  | $ | (13,390 | ) |  | $ | 13,887 |
GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME THREE MONTHS ENDED JUNE 30, 2016 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Net income | $ | 18,971 |  |  | $ | 36,764 |  |  | $ | 7,418 |  |  | $ | (44,541 | ) |  | $ | 18,612 |
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | — |  |  | — |  |  | 7,753 |  |  | — |  |  | 7,753 |
Adjustment to retirement benefit liability, net of tax | — |  |  | (1 | ) |  | — |  |  | — |  |  | (1 | )
Adjustment to post employment health care benefit liability, net of tax | — |  |  | 38 |  |  | — |  |  | — |  |  | 38 |
Other comprehensive income | — |  |  | 37 |  |  | 7,753 |  |  | — |  |  | 7,790 |
Total comprehensive income | $ | 18,971 |  |  | $ | 36,801 |  |  | $ | 15,171 |  |  | $ | (44,541 | ) |  | $ | 26,402 |
GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME SIX MONTHS ENDED JUNE 30, 2017 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Net income (loss) | $ | 16,947 |  |  | $ | 21,145 |  |  | $ | (2,040 | ) |  | $ | (19,287 | ) |  | $ | 16,765 |
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | — |  |  | — |  |  | 1,770 |  |  | — |  |  | 1,770 |
Adjustment to retirement benefit liability, net of tax | — |  |  | (6 | ) |  | — |  |  | — |  |  | (6 | )
Adjustment to post employment health care benefit liability, net of tax | — |  |  | 59 |  |  | — |  |  | — |  |  | 59 |
Other comprehensive income | — |  |  | 53 |  |  | 1,770 |  |  | — |  |  | 1,823 |
Total comprehensive income (loss) | $ | 16,947 |  |  | $ | 21,198 |  |  | $ | (270 | ) |  | $ | (19,287 | ) |  | $ | 18,588 |
GIBRALTAR INDUSTRIES, INC. CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME SIX MONTHS ENDED JUNE 30, 2016 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Net income | $ | 28,277 |  |  | $ | 48,260 |  |  | $ | 7,669 |  |  | $ | (56,565 | ) |  | $ | 27,641 |
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | — |  |  | — |  |  | 10,831 |  |  | — |  |  | 10,831 |
Adjustment to retirement benefit liability, net of tax | — |  |  | (2 | ) |  | — |  |  | — |  |  | (2 | )
Adjustment to post employment health care benefit liability, net of tax | — |  |  | 76 |  |  | — |  |  | — |  |  | 76 |
Other comprehensive income | — |  |  | 74 |  |  | 10,831 |  |  | — |  |  | 10,905 |
Total comprehensive income | $ | 28,277 |  |  | $ | 48,334 |  |  | $ | 18,500 |  |  | $ | (56,565 | ) |  | $ | 38,546 |
Schedule Of Consolidating Balance Sheets | RALTAR INDUSTRIES, INC. CONSOLIDATING BALANCE SHEETS JUNE 30, 2017 (in thousands)
| Gibraltar Industries, Inc. |  | Guarantor Subsidiaries |  | Non-Guarantor Subsidiaries |  | Eliminations |  | Total
Assets |  |  |  |  |  |  |  |  |
Current assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ | — |  |  | $ | 158,843 |  |  | $ | 23,536 |  |  | $ | — |  |  | $ | 182,379 |
Accounts receivable, net | — |  |  | 131,513 |  |  | 7,358 |  |  | — |  |  | 138,871 |
Intercompany balances | (10,789 | ) |  | 15,604 |  |  | (4,815 | ) |  | — |  |  | — |
Inventories | — |  |  | 81,927 |  |  | 4,138 |  |  | — |  |  | 86,065 |
Other current assets | 2,730 |  |  | 1,498 |  |  | 4,123 |  |  | — |  |  | 8,351 |
Total current assets | (8,059 | ) |  | 389,385 |  |  | 34,340 |  |  | — |  |  | 415,666 |
Property, plant, and equipment, net | — |  |  | 92,450 |  |  | 3,419 |  |  | — |  |  | 95,869 |
Goodwill | — |  |  | 298,399 |  |  | 22,449 |  |  | — |  |  | 320,848 |
Acquired intangibles | — |  |  | 101,232 |  |  | 9,093 |  |  | — |  |  | 110,325 |
Other assets | — |  |  | 4,750 |  |  | — |  |  | — |  |  | 4,750 |
Investment in subsidiaries | 705,610 |  |  | 58,978 |  |  | — |  |  | (764,588 | ) |  | — |
| $ | 697,551 |  |  | $ | 945,194 |  |  | $ | 69,301 |  |  | $ | (764,588 | ) |  | $ | 947,458 |
Liabilities and Shareholders’ Equity |  |  |  |  |  |  |  |  |
Current liabilities: |  |  |  |  |  |  |  |  |
Accounts payable | $ | — |  |  | $ | 84,230 |  |  | $ | 3,777 |  |  | $ | — |  |  | $ | 88,007 |
Accrued expenses | 7,369 |  |  | 60,533 |  |  | 1,487 |  |  | — |  |  | 69,389 |
Billings in excess of cost | — |  |  | 11,524 |  |  | 2,439 |  |  |  |  | 13,963 |
Current maturities of long-term debt | — |  |  | 400 |  |  | — |  |  | — |  |  | 400 |
Total current liabilities | 7,369 |  |  | 156,687 |  |  | 7,703 |  |  | — |  |  | 171,759 |
Long-term debt | 208,279 |  |  | 950 |  |  | — |  |  | — |  |  | 209,229 |
Deferred income taxes | — |  |  | 35,583 |  |  | 2,620 |  |  | — |  |  | 38,203 |
Other non-current liabilities | — |  |  | 46,364 |  |  | — |  |  | — |  |  | 46,364 |
Shareholders’ equity | 481,903 |  |  | 705,610 |  |  | 58,978 |  |  | (764,588 | ) |  | 481,903 |
| $ | 697,551 |  |  | $ | 945,194 |  |  | $ | 69,301 |  |  | $ | (764,588 | ) |  | $ | 947,458 |
GIBRALTAR INDUSTRIES, INC. CONSOLIDATING BALANCE SHEETS 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 |
Schedule Of Condensed Consolidating Statements Of Cash Flows | GIBRALTAR INDUSTRIES, INC. CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS SIX MONTHS ENDED JUNE 30, 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 | $ | (6,640 | ) |  | $ | 31,687 |  |  | $ | (3,327 | ) |  | $ | — |  |  | $ | 21,720 |
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |
Cash paid for acquisitions | — |  |  | (18,494 | ) |  | — |  |  | — |  |  | (18,494 | )
Net proceeds from sale of property and equipment | — |  |  | 12,627 |  |  | 151 |  |  | — |  |  | 12,778 |
Purchases of property, plant, and equipment | — |  |  | (3,123 | ) |  | (151 | ) |  | — |  |  | (3,274 | )
Net cash used in investing activities | — |  |  | (8,990 | ) |  | — |  |  | — |  |  | (8,990 | )
Cash Flows from Financing Activities |  |  |  |  |  |  |  |  |
Long-term debt payments | — |  |  | (400 | ) |  | — |  |  | — |  |  | (400 | )
Purchase of treasury stock at market prices | (1,003 | ) |  | — |  |  | — |  |  | — |  |  | (1,003 | )
Net proceeds from issuance of common stock | 247 |  |  | — |  |  | — |  |  | — |  |  | 247 |
Intercompany financing | 7,396 |  |  | (7,280 | ) |  | (116 | ) |  | — |  |  | — |
Net cash provided by (used in) financing activities | 6,640 |  |  | (7,680 | ) |  | (116 | ) |  | — |  |  | (1,156 | )
Effect of exchange rate changes on cash | — |  |  | — |  |  | 628 |  |  | — |  |  | 628 |
Net increase (decrease) in cash and cash equivalents | — |  |  | 15,017 |  |  | (2,815 | ) |  | — |  |  | 12,202 |
Cash and cash equivalents at beginning of year | — |  |  | 143,826 |  |  | 26,351 |  |  | — |  |  | 170,177 |
Cash and cash equivalents at end of period | $ | — |  |  | $ | 158,843 |  |  | $ | 23,536 |  |  | $ | — |  |  | $ | 182,379 |
GIBRALTAR INDUSTRIES, INC. CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS SIX MONTHS ENDED JUNE 30, 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 | $ | (27,296 | ) |  | $ | 62,474 |  |  | $ | 14,263 |  |  | $ | — |  |  | $ | 49,441 |
Cash Flows from Investing Activities |  |  |  |  |  |  |  |  |
Cash paid for acquisitions | — |  |  | (2,314 | ) |  | — |  |  | — |  |  | (2,314 | )
Net proceeds from sale of property and equipment | — |  |  | 133 |  |  | 29 |  |  | — |  |  | 162 |
Purchases of property, plant, and equipment | — |  |  | (3,852 | ) |  | (183 | ) |  | — |  |  | (4,035 | )
Net proceeds from sale of business | — |  |  | — |  |  | 8,479 |  |  | — |  |  | 8,479 |
Other, net | — |  |  | 1,118 |  |  | — |  |  | — |  |  | 1,118 |
Net cash (used in) provided by investing activities | — |  |  | (4,915 | ) |  | 8,325 |  |  | — |  |  | 3,410 |
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 | (462 | ) |  | — |  |  | — |  |  | — |  |  | (462 | )
Net proceeds from issuance of common stock | 2,057 |  |  | — |  |  | — |  |  | — |  |  | 2,057 |
Intercompany financing | 25,701 |  |  | 4,060 |  |  | (29,761 | ) |  | — |  |  | — |
Net cash provided by (used in) financing activities | 27,296 |  |  | 3,606 |  |  | (29,761 | ) |  | — |  |  | 1,141 |
Effect of exchange rate changes on cash | — |  |  | — |  |  | 1,264 |  |  | — |  |  | 1,264 |
Net increase (decrease) in cash and cash equivalents | — |  |  | 61,165 |  |  | (5,909 | ) |  | — |  |  | 55,256 |
Cash and cash equivalents at beginning of year | — |  |  | 39,597 |  |  | 29,261 |  |  | — |  |  | 68,858 |
Cash and cash equivalents at end of period | $ | — |  |  | $ | 100,762 |  |  | $ | 23,352 |  |  | $ | — |  |  | $ | 124,114 |

X
- Definition Schedule Of Consolidated Statements Of Comprehensive Income [Table Text Block] + References No definition available. + Details
Name: | rock_ScheduleOfConsolidatedStatementsOfComprehensiveIncomeTableTextBlock
Namespace Prefix: | rock_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Consolidating Balance Sheets [Table Text Block] + References No definition available. + Details
Name: | rock_ScheduleOfConsolidatingBalanceSheetsTableTextBlock
Namespace Prefix: | rock_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Consolidating Statements Of Cash Flows [Table Text Block] + References No definition available. + Details
Name: | rock_ScheduleOfConsolidatingStatementsOfCashFlowsTableTextBlock
Namespace Prefix: | rock_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Schedule Of Consolidating Statements Of Operations [Table Text Block] + References No definition available. + Details
Name: | rock_ScheduleOfConsolidatingStatementsOfOperationsTableTextBlock
Namespace Prefix: | rock_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration