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Equity (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Summary of changes in the components of equity        
Balance, December 31, 2012     $ 118,097  
Accrued dividends on preferred stock     (615)  
Repurchases of Class B common stock from employees     (270) (133)
Exercise of stock options     53 5
Issuance of common stock to subsidiary deferred stock unit holders         
Grants of equity of subsidiaries         
Stock-based compensation     2,931  
Comprehensive (loss) income:        
Net (loss) income 2,042 (1,084) (4,223) (3,595)
Other comprehensive income (loss) 235 112 336 45
Comprehensive (loss) income 2,277 (972) (3,887) (3,550)
Balance, September 30, 2013 116,309   116,309  
Attributable to Genie [Member]
        
Summary of changes in the components of equity        
Balance, December 31, 2012     122,490  
Accrued dividends on preferred stock     (615)  
Repurchases of Class B common stock from employees     (270)  
Exercise of stock options     53  
Issuance of common stock to subsidiary deferred stock unit holders     1,837  
Grants of equity of subsidiaries     357  
Stock-based compensation     2,931  
Comprehensive (loss) income:        
Net (loss) income     (5,420)  
Other comprehensive income (loss)     349  
Comprehensive (loss) income     (5,071)  
Balance, September 30, 2013 121,712   121,712  
Noncontrolling Interests [Member]
        
Summary of changes in the components of equity        
Balance, December 31, 2012     (4,393)  
Accrued dividends on preferred stock         
Repurchases of Class B common stock from employees         
Exercise of stock options         
Issuance of common stock to subsidiary deferred stock unit holders     (1,837)  
Grants of equity of subsidiaries     (357)  
Stock-based compensation         
Comprehensive (loss) income:        
Net (loss) income     1,197  
Other comprehensive income (loss)     (13)  
Comprehensive (loss) income     1,184  
Balance, September 30, 2013 $ (5,403)   $ (5,403)