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Stock-Based Compensation - Incentive Stock Options (Details) - Stock options - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Sep. 30, 2014
Sep. 30, 2013
Number of Optioned Shares        
Balance at the beginning of the period (in shares)   160,434    
Grants (in shares) 0 0    
Forfeited (in shares)   (1,760)    
Outstanding and vested Legacy TGC options   279,756    
Options cancelled   (10,000)    
Balance at the end of the period (in shares) 160,434 428,430    
Exercisable at the end of the period (in shares)   428,430    
Weighted Average Exercise Price        
Balance at the beginning of the period (in dollars per share)   $ 10.74    
Forfeited (in dollars per share)   10.74    
Outstanding and vested Legacy TGC options (in dollars per share)   14.25    
Legacy TGC options cancelled (in dollars per share)   11.79    
Balance at the end of the period (in dollars per share) $ 10.74 13.01    
Exercisable at the end of the period (in dollars per share)   $ 13.01    
Weighted Average Remaining Contractual Term        
Outstanding at the end of the period (in years)   2 years 11 months 5 days    
Exercisable at the end of the period (in years)   2 years 11 months 5 days    
Additional disclosures        
Tax deductions recorded when options are awarded   $ 0    
Unrecognized compensation expense related to share-based compensation plans   0    
Cash received from share-based payment arrangements $ 0 $ 0 $ 32,000 $ 608,000
Legacy Dawson Plan        
Number of Optioned Shares        
Grants (in shares) 0 0 0 0
Vested (in shares) 0 0 0 0
Exercised (in shares) 0 0   0
Additional disclosures        
Excess tax benefits from disqualifying dispositions $ 0 $ 0 $ 0 $ 0
Total intrinsic value of options exercised     $ 13,000