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Net Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Income (loss) from continuing operations $ 5,537us-gaap_IncomeLossFromContinuingOperations $ (2,086)us-gaap_IncomeLossFromContinuingOperations
Loss from discontinued operations (28)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity 0us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income (loss) $ 5,509us-gaap_NetIncomeLoss $ (2,086)us-gaap_NetIncomeLoss
Weighted average shares outstanding 31,191,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 31,034,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Common stock options and restricted stock 195,000us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Weighted average shares outstanding – Diluted 31,386,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 31,034,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Common shares    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from earnings per share calculation 453,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_CommonStockMember
515,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= us-gaap_CommonStockMember
Weighted Average Stock Options, Unvested Restricted Stock, and Unvested Restricted Stock Units    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive securities excluded from earnings per share calculation   209,000us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
/ us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareByAntidilutiveSecuritiesAxis
= rock_WeightedAverageStockOptionsUnvestedRestrictedStockandUnvestedRestrictedStockUnitsMember