XML 144 R128.htm IDEA: XBRL DOCUMENT
v3.6.0.2

Segment Information (Measurements Used by Management to Assess Performance of Segments) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales | $ 231,838 | $ 272,734 | $ 265,738 | $ 237,671 | $ 282,093 | $ 304,994 | $ 253,171 | $ 200,615 | $ 1,007,981 | $ 1,040,873 | $ 862,087
Income (loss) from operations: | 584 | $ 26,363 | $ 28,416 | $ 17,601 | 4,520 | $ 23,394 | $ 11,201 | $ 8,970 | 72,964 | 48,085 | (70,417)
Depreciation and amortization |  |  |  |  |  |  |  |  | 24,114 | 30,548 | 25,432
Total assets | 918,245 |  |  |  | 889,772 |  |  |  | 918,245 | 889,772 | 810,471
Capital expenditures |  |  |  |  |  |  |  |  | 10,779 | 12,373 | 23,291
Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations: |  |  |  |  |  |  |  |  | 43,214 | 12,659 | 0
Intersegment sales |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  | (1,495) | (1,536) | (1,260)
Unallocated Corporate Expenses |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Income (loss) from operations: |  |  |  |  |  |  |  |  | (36,797) | (26,959) | (12,199)
Depreciation and amortization |  |  |  |  |  |  |  |  | 377 | 662 | 823
Total assets | 153,338 |  |  |  | 37,235 |  |  |  | 153,338 | 37,235 | 108,229
Capital expenditures |  |  |  |  |  |  |  |  | 377 | 328 | 135
Residential Products | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 430,938 | 475,653 | 431,915
Income (loss) from operations: |  |  |  |  |  |  |  |  | 65,241 | 46,804 | 16,416
Depreciation and amortization |  |  |  |  |  |  |  |  | 9,297 | 9,967 | 10,699
Total assets | 331,975 |  |  |  | 363,339 |  |  |  | 331,975 | 363,339 | 394,092
Capital expenditures |  |  |  |  |  |  |  |  | 5,182 | 3,328 | 12,731
Industrial and Infrastructure Products |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 295,018 | 376,688 | 430,172
Industrial and Infrastructure Products | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales: |  |  |  |  |  |  |  |  | 296,513 | 378,224 | 431,432
Income (loss) from operations: |  |  |  |  |  |  |  |  | 1,306 | 15,581 | (74,634)
Depreciation and amortization |  |  |  |  |  |  |  |  | 8,237 | 12,108 | 13,910
Total assets | 225,691 |  |  |  | 273,987 |  |  |  | 225,691 | 273,987 | 308,150
Capital expenditures |  |  |  |  |  |  |  |  | 2,060 | 4,846 | 10,425
Renewable Energy & Conservation | Operating Segments |  |  |  |  |  |  |  |  |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net sales |  |  |  |  |  |  |  |  | 282,025 | 188,532 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  | 6,203 | 7,811 | 0
Total assets | $ 207,241 |  |  |  | $ 215,211 |  |  |  | 207,241 | 215,211 | 0
Capital expenditures |  |  |  |  |  |  |  |  | $ 3,160 | $ 3,871 | $ 0

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_Assets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
Name: | us-gaap_DepreciationDepletionAndAmortization
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net result for the period of deducting operating expenses from operating revenues. + References No definition available. + Details
Name: | us-gaap_OperatingIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_Revenues
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.1) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_SalesRevenueNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingOtherSignificantReconcilingItemLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_OperatingSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_IntersegmentEliminationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ConsolidationItemsAxis=us-gaap_CorporateNonSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rock_ResidentialProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rock_IndustrialAndInfrastructureProductsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=rock_RenewableEnergyandConservationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |