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Merger (Details)
 3 Months Ended 12 Months Ended
Feb. 11, 2015
USD ($)
$ / shares
shares
Feb. 10, 2015
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
segment
$ / shares
shares
Sep. 30, 2014
USD ($)
$ / shares
shares
Common stock, par value (in dollars per share) | $ / shares     $ 0.01   $ 0.01 $ 0.01
Split-effected Common Stock | shares         1.76  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed            
Net deferred tax asset     $ 29,661,000   $ 29,661,000 $ 14,368,000
Common stock, shares outstanding | shares     21,580,865   21,580,865 14,194,810
Number of operating segments | segment         1  
Pro Forma Information            
Shares used in calculation of earnings per share | shares       21,400,593 21,537,480 21,367,677
Pro forma total revenues       $ 76,897,000 $ 248,295,000 $ 373,544,000
Pro forma net loss       $ (7,722,000) $ (30,256,000) $ (13,383,000)
Pro forma net loss per share            
Basic | $ / shares       $ (0.36) $ (1.40) $ (0.63)
Diluted | $ / shares       $ (0.36) $ (1.40) $ (0.63)
Legacy TGC            
Common stock, par value (in dollars per share) | $ / shares   $ 0.01        
Reverse stock split ratio   0.33        
Split-effected Common Stock | shares 1.760          
Increase in preliminary estimated amount of property, plant and equipment     $ 5,055,000      
Increase in preliminary estimated amount of current liability     943,000      
Decrease in preliminary estimated amount of current assets     625,000      
Decrease in preliminary estimated amount of intangible assets     2,953,000      
Decrease in deferred tax assets related to adjustments to preliminary estimates     534,000      
Increase in depreciation     628,000      
Decrease in amortization expense     $ 697,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed            
Stock consideration $ 42,902,000          
Interest bearing debt assumed 12,048,000          
Debt-free current liabilities 13,590,000          
Total purchase price consideration including liabilities assumed 68,540,000          
Current assets excluding cash and cash equivalents 15,531,000          
Cash and cash equivalents 12,382,000          
Total current assets 27,913,000          
Fair value of property, plant and equipment 33,867,000          
Identified intangible assets 400,000          
Net deferred tax asset 6,360,000          
Total indicated value of assets $ 68,540,000          
Common stock, shares outstanding | shares 7,381,476          
Accrued taxes $ 865,000          
Pre-tax merger-related costs         $ 3,314,000  
Number of operating segments | segment         1  
Legacy TGC | Minimum            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed            
Estimated useful lives of property, plant and equipment 18 months          
Legacy TGC | Maximum            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed            
Estimated useful lives of property, plant and equipment 12 years          
Legacy Dawson            
Common stock, par value (in dollars per share) | $ / shares $ 0.33