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NET LOSS PER COMMON SHARE (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Nonvested shares outstanding 1,110,600   1,110,600  
Anti-dilutive shares (in shares)     1,110,600  
Common shares outstanding, basic:        
Weighted average common shares outstanding - Basic 60,487,189   60,459,145  
Common shares outstanding, diluted:        
Weighted average common shares outstanding - Basic 60,487,189   60,459,145  
Weighted-average common shares outstanding, diluted (in shares) 60,487,189   60,459,145  
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 $ (40,332)   $ (78,773)  
Net loss attributable to GS&T for the computation of diluted net loss per share $ (40,332)   $ (78,773)  
Predecessor        
Common shares outstanding, basic:        
Weighted average common shares outstanding - Basic   43,568,942   43,568,942
Common shares outstanding, diluted:        
Weighted average common shares outstanding - Basic   43,568,942   43,568,942
Weighted-average common shares outstanding, diluted (in shares)   43,568,942   43,568,942
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   $ (60,524)   $ (99,630)
Net loss attributable to GS&T for the computation of diluted net loss per share   $ (60,524)   $ (99,630)