XML 40 R28.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Goodwill and Related Intangible Assets (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2014
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule Of Changes In Carrying Amount Of Goodwill | The changes in the carrying amount of goodwill for the six months ended June 30, 2014 are as follows (in thousands):
| Residential Products |  | Industrial and Infrastructure Products |  | Total
Balance at December 31, 2013 | $ | 195,520 |  |  | $ | 145,654 |  |  | $ | 341,174 |
Foreign currency translation | — |  |  | 22 |  |  | 22 |
Balance at June 30, 2014 | $ | 195,520 |  |  | $ | 145,676 |  |  | $ | 341,196 |
Schedule Of Acquired Intangible Assets | Acquired intangible assets consist of the following (in thousands):
| June 30, 2014 |  | December 31, 2013 |  |
| Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization |  | Estimated Life
Indefinite-lived intangible assets: |  |  |  |  |  |  |  |  |
Trademarks | $ | 45,791 |  |  | $ | — |  |  | $ | 45,724 |  |  | $ | — |  |  | Indefinite
Finite-lived intangible assets: |  |  |  |  |  |  |  |  |
Trademarks | 3,996 |  |  | 1,636 |  |  | 3,989 |  |  | 1,420 |  |  | 2 to 15 Years
Unpatented technology | 24,690 |  |  | 7,874 |  |  | 24,690 |  |  | 6,980 |  |  | 5 to 20 Years
Customer relationships | 54,279 |  |  | 30,716 |  |  | 54,171 |  |  | 28,926 |  |  | 5 to 16 Years
Non-compete agreements | 1,937 |  |  | 1,493 |  |  | 1,937 |  |  | 1,408 |  |  | 4 to 10 Years
Backlog | 1,330 |  |  | 1,330 |  |  | 1,330 |  |  | 1,330 |  |  | 1 to 2 Years
| 86,232 |  |  | 43,049 |  |  | 86,117 |  |  | 40,064 |  |  |
Total acquired intangible assets | $ | 132,023 |  |  | $ | 43,049 |  |  | $ | 131,841 |  |  | $ | 40,064 |  |  |
Schedule of Acquired Intangible Asset Amortization Expense | The following table summarizes the acquired intangible asset amortization expense for the three and six months ended June 30 (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2014 |  | 2013 |  | 2014 |  | 2013
Amortization expense | $ | 1,435 |  |  | $ | 1,677 |  |  | $ | 2,874 |  |  | $ | 3,396 |
Schedule Of Amortization Expense | Amortization expense related to acquired intangible assets for the remainder of fiscal 2014 and the next five years thereafter is estimated as follows (in thousands):
2014 | $2,844
2015 | $5,580
2016 | $5,245
2017 | $4,883
2018 | $4,321
2019 | $2,172

X
- Definition Schedule of Acquired Intangible Asset Amortization Expense [Table Text Block] + References No definition available. + Details
Name: | rock_ScheduleofAcquiredIntangibleAssetAmortizationExpenseTableTextBlock
Namespace Prefix: | rock_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
Name: | us-gaap_ScheduleOfAcquiredFiniteLivedIntangibleAssetsByMajorClassTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the amount of amortization expense expected to be recorded in succeeding fiscal years for finite-lived intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
Name: | us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of goodwill by reportable segment and in total which includes a rollforward schedule. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 + Details
Name: | us-gaap_ScheduleOfGoodwillTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration