XML 127 R129.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Supplemental Financial Information (Consolidating Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | --- | --- | ---
Current assets: |  |  |  |
Cash and cash equivalents | $ 110,610 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 97,039 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 48,028 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 54,117 us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net of reserve | 101,141 us-gaap_AccountsReceivableNetCurrent | 90,082 us-gaap_AccountsReceivableNetCurrent |  |
Intercompany balances | 0 rock_InterCompanyBalances | 0 rock_InterCompanyBalances |  |
Inventories | 128,743 us-gaap_InventoryNet | 121,152 us-gaap_InventoryNet |  |
Other current assets | 19,937 us-gaap_OtherAssetsCurrent | 14,127 us-gaap_OtherAssetsCurrent |  |
Total current assets | 360,431 us-gaap_AssetsCurrent | 322,400 us-gaap_AssetsCurrent |  |
Property, plant, and equipment, net | 129,575 us-gaap_PropertyPlantAndEquipmentNet | 131,752 us-gaap_PropertyPlantAndEquipmentNet |  |
Goodwill | 236,044 us-gaap_Goodwill | 341,174 us-gaap_Goodwill | 359,863 us-gaap_Goodwill |
Acquired intangibles | 82,215 us-gaap_IntangibleAssetsNetExcludingGoodwill | 91,777 us-gaap_IntangibleAssetsNetExcludingGoodwill |  |
Other assets | 5,895 us-gaap_OtherAssetsNoncurrent | 7,059 us-gaap_OtherAssetsNoncurrent |  |
Investment in subsidiaries | 0 us-gaap_Investments | 0 us-gaap_Investments |  |
Total assets | 814,160 us-gaap_Assets | 894,162 us-gaap_Assets | 883,674 us-gaap_Assets |
Current liabilities: |  |  |  |
Accounts payable | 81,246 us-gaap_AccountsPayableCurrent | 69,625 us-gaap_AccountsPayableCurrent |  |
Accrued expenses | 52,439 us-gaap_AccruedLiabilitiesCurrent | 49,879 us-gaap_AccruedLiabilitiesCurrent |  |
Current maturities of long-term debt | 400 us-gaap_LongTermDebtCurrent | 409 us-gaap_LongTermDebtCurrent |  |
Total current liabilities | 134,085 us-gaap_LiabilitiesCurrent | 119,913 us-gaap_LiabilitiesCurrent |  |
Long-term debt | 213,200 us-gaap_LongTermDebtNoncurrent | 213,598 us-gaap_LongTermDebtNoncurrent |  |
Deferred income taxes | 49,772 us-gaap_DeferredTaxLiabilitiesNoncurrent | 55,124 us-gaap_DeferredTaxLiabilitiesNoncurrent |  |
Other non-current liabilities | 29,874 us-gaap_OtherLiabilitiesNoncurrent | 33,778 us-gaap_OtherLiabilitiesNoncurrent |  |
Total shareholders’ equity | 387,229 us-gaap_StockholdersEquity | 471,749 us-gaap_StockholdersEquity | 476,822 us-gaap_StockholdersEquity | 459,936 us-gaap_StockholdersEquity
Total liabilities and shareholders' equity | 814,160 us-gaap_LiabilitiesAndStockholdersEquity | 894,162 us-gaap_LiabilitiesAndStockholdersEquity |  |
Gibraltar Industries, Inc. |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember
Accounts receivable, net of reserve | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Intercompany balances | 21,619 rock_InterCompanyBalances / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 23,618 rock_InterCompanyBalances / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Inventories | 0 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other current assets | 4,484 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 7,578 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total current assets | 26,103 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 31,196 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Property, plant, and equipment, net | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Goodwill | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Acquired intangibles | 0 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other assets | 2,931 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,415 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Investment in subsidiaries | 573,664 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 652,689 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total assets | 602,698 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 687,300 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Current liabilities: |  |  |  |
Accounts payable | 0 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Accrued expenses | 5,469 us-gaap_AccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,551 us-gaap_AccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Current maturities of long-term debt | 0 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total current liabilities | 5,469 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,551 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Long-term debt | 210,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 210,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Deferred income taxes | 0 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Other non-current liabilities | 0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total shareholders’ equity | 387,229 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 471,749 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Total liabilities and shareholders' equity | 602,698 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 687,300 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |
Guarantor Subsidiaries |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 91,466 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 75,856 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 26,163 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 34,691 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember
Accounts receivable, net of reserve | 91,713 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 79,356 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Intercompany balances | (1,850)rock_InterCompanyBalances / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | (1,655)rock_InterCompanyBalances / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Inventories | 120,091 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 111,676 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other current assets | 14,488 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 5,722 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total current assets | 315,908 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 270,955 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Property, plant, and equipment, net | 116,628 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 119,587 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Goodwill | 229,558 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 334,123 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Acquired intangibles | 77,259 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 86,014 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other assets | 2,964 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 3,643 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Investment in subsidiaries | 32,404 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 33,259 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total assets | 774,721 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 847,581 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Current liabilities: |  |  |  |
Accounts payable | 74,751 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 62,464 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Accrued expenses | 45,561 us-gaap_AccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 42,418 us-gaap_AccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Current maturities of long-term debt | 400 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 409 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total current liabilities | 120,712 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 105,291 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Long-term debt | 3,200 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 3,598 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Deferred income taxes | 47,717 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 52,746 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Other non-current liabilities | 29,428 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 33,257 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total shareholders’ equity | 573,664 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 652,689 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Total liabilities and shareholders' equity | 774,721 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember | 847,581 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_GuarantorSubsidiariesMember |  |
Non-Guarantor Subsidiaries |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 19,144 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 21,183 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 21,865 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 19,426 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember
Accounts receivable, net of reserve | 9,428 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 10,726 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Intercompany balances | (19,769)rock_InterCompanyBalances / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | (21,963)rock_InterCompanyBalances / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Inventories | 8,652 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 9,476 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other current assets | 965 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 827 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total current assets | 18,420 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 20,249 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Property, plant, and equipment, net | 12,947 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 12,165 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Goodwill | 6,486 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 7,051 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Acquired intangibles | 4,956 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 5,763 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other assets | 0 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Investment in subsidiaries | 0 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_Investments / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total assets | 42,809 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 45,229 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Current liabilities: |  |  |  |
Accounts payable | 6,495 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 7,161 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Accrued expenses | 1,409 us-gaap_AccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 1,910 us-gaap_AccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Current maturities of long-term debt | 0 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total current liabilities | 7,904 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 9,071 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Long-term debt | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Deferred income taxes | 2,055 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 2,378 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Other non-current liabilities | 446 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 521 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total shareholders’ equity | 32,404 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 33,259 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Total liabilities and shareholders' equity | 42,809 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember | 45,229 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_NonGuarantorSubsidiariesMember |  |
Eliminations |  |  |  |
Current assets: |  |  |  |
Cash and cash equivalents | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember
Accounts receivable, net of reserve | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_AccountsReceivableNetCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Intercompany balances | 0 rock_InterCompanyBalances / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 rock_InterCompanyBalances / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Inventories | 0 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_InventoryNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Other current assets | 0 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Total current assets | 0 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Property, plant, and equipment, net | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_PropertyPlantAndEquipmentNet / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Goodwill | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_Goodwill / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Acquired intangibles | 0 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_IntangibleAssetsNetExcludingGoodwill / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Other assets | 0 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Investment in subsidiaries | (606,068)us-gaap_Investments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (685,948)us-gaap_Investments / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Total assets | (606,068)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (685,948)us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Current liabilities: |  |  |  |
Accounts payable | 0 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_AccountsPayableCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Accrued expenses | 0 us-gaap_AccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_AccruedLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Current maturities of long-term debt | 0 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Total current liabilities | 0 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Long-term debt | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Deferred income taxes | 0 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_DeferredTaxLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Other non-current liabilities | 0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | 0 us-gaap_OtherLiabilitiesNoncurrent / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Total shareholders’ equity | (606,068)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | (685,948)us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |
Total liabilities and shareholders' equity | $ (606,068)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember | $ (685,948)us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ConsolidationEliminationsMember |  |

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- Definition Inter Company Balances + References No definition available. + Details
Name: | rock_InterCompanyBalances
Namespace Prefix: | rock_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Subparagraph a -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_AccountsPayableCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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