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NET LOSS PER COMMON SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2015 | Mar. 31, 2014
Nonvested shares outstanding | 1,110,600 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber |
Anti-dilutive shares (in shares) | 1,110,600 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |
Common shares outstanding, basic: |  |
Weighted average common shares outstanding - Basic | 60,430,789 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Common shares outstanding, diluted: |  |
Weighted average common shares outstanding - Basic | 60,430,789 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic |
Weighted-average common shares outstanding, diluted (in shares) | 60,430,789 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding |
Reconciliation of the net loss attributable to GS&T and the net loss attributable to GS&T for diluted net loss per share |  |
Net loss attributable to GS&T | $ (38,442)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic |
Net loss attributable to GS&T for the computation of diluted net loss per share | (38,442)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted |
Predecessor |  |
Common shares outstanding, basic: |  |
Weighted average common shares outstanding - Basic |  | 43,568,942 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Common shares outstanding, diluted: |  |
Weighted average common shares outstanding - Basic |  | 43,568,942 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Weighted-average common shares outstanding, diluted (in shares) |  | 43,568,942 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Reconciliation of the net loss attributable to GS&T and the net loss attributable to GS&T for diluted net loss per share |  |
Net loss attributable to GS&T |  | (39,105)us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember
Net loss attributable to GS&T for the computation of diluted net loss per share |  | $ (39,105)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted / us-gaap_StatementScenarioAxis = us-gaap_PredecessorMember

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 + Details
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- Definition Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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- Definition Net Income or Loss Available to Common Stockholders plus adjustments resulting from the assumption that dilutive convertible securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1505-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1377-109256 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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