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Merger (Details)
 3 Months Ended 12 Months Ended
Feb. 11, 2015
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Dec. 31, 2015
USD ($)
$ / 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 (in shares) | shares       1.76    
Fair value of assets acquired and liabilities assumed            
Net deferred tax asset   $ 29,661,000   $ 29,424,000 $ 29,661,000  
Common stock, shares outstanding | shares   21,580,865   21,656,406 21,580,865  
Accrual for uncertain tax positions and contingencies related to certain tax matters         $ 715,000  
Revenues       $ 133,330,000 $ 234,685,000 $ 261,683,000
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 (in shares) | shares 1.760          
Increase in preliminary estimated amount of property 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        
Fair value of 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 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          
Accrual for uncertain tax positions and contingencies related to certain tax matters $ 865,000          
Pre-tax merger-related costs         $ 3,314,000  
Legacy TGC | Minimum            
Fair value of assets acquired and liabilities assumed            
Estimated useful lives of property and equipment 18 months          
Legacy TGC | Maximum            
Fair value of assets acquired and liabilities assumed            
Estimated useful lives of property and equipment 12 years          
Legacy Dawson            
Common stock, par value (in dollars per share) | $ / shares $ 0.3333