XML 71 R56.htm IDEA: XBRL DOCUMENT
v3.22.4

Inventories (Summary of Activity within the Reserve for Excess, Obsolete, and Slow Moving Inventory) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Inventory [Roll Forward] |  |  |
Beginning balance | $ 4,400 | $ 4,161 | $ 3,463
Excess, obsolete and slow moving inventory expense | 1,582 | 215 | 355
Scrapped inventory and other adjustments | (197) | (24) | (343)
Ending balance | $ 6,179 | $ 4,400 | $ 4,161

X
- Definition Inventory [Roll Forward] + References No definition available. + Details
Name: | rock_InventoryRollForward
Namespace Prefix: | rock_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Inventory valuation excess, obsolete, and slow-moving inventory + References No definition available. + Details
Name: | rock_InventoryValuationExcessObsoleteAndSlowMovingInventory
Namespace Prefix: | rock_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Inventory valuation scrapped inventory and other adjustments. + References No definition available. + Details
Name: | rock_InventoryValuationScrappedInventoryAndOtherAdjustments
Namespace Prefix: | rock_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of valuation reserve for inventory. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(6)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 330 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.BB) -URI https://asc.fasb.org/extlink&oid=27011343&loc=d3e100047-122729 + Details
Name: | us-gaap_InventoryValuationReserves
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant