Quarterly report pursuant to Section 13 or 15(d)

Loss per Share of Common Stock - Basic and Diluted Loss Per Share of Common Stock (Detail)

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Loss per Share of Common Stock - Basic and Diluted Loss Per Share of Common Stock (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Calculation of basic loss per share of common stock:    
Net loss attributable to common stockholders $ (553)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ (14,637)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator for basic weighted average shares of common stock 20,210,975us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 15,746,714us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic loss per share of common stock $ (0.03)us-gaap_EarningsPerShareBasic $ (0.93)us-gaap_EarningsPerShareBasic
Calculation of diluted loss per share of common stock:    
Net loss attributable to common stockholders (553)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic (14,637)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Add: Income impact of assumed conversion of senior common stock 0us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther 0us-gaap_DilutiveSecuritiesEffectOnBasicEarningsPerShareOther
Net loss attributable to common stockholders plus assumed conversions $ (553)good_NetIncomeLossAvailableToCommonStockholdersPlusAssumedConversion $ (14,637)good_NetIncomeLossAvailableToCommonStockholdersPlusAssumedConversion
Denominator for basic weighted average shares of common stock 20,210,975us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 15,746,714us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of convertible senior common stock 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities 0us-gaap_IncrementalCommonSharesAttributableToConversionOfDebtSecurities
Denominator for diluted weighted average shares of common stock 20,210,975us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 15,746,714us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted loss per share of common stock $ (0.03)us-gaap_EarningsPerShareDiluted $ (0.93)us-gaap_EarningsPerShareDiluted