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Equity Investment - Additional Information (Detail)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 3 Months Ended 6 Months Ended 1 Months Ended
Mar. 25, 2013
USD ($)
Feb. 28, 2014
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Jun. 30, 2013
USD ($)
Mar. 25, 2013
Feb. 28, 2014
TyraTech Inc.
USD ($)
Feb. 28, 2014
TyraTech Inc.
GBP (£)
Equity Method Investments [Line Items]                
Equity investment $ 3,687       $ 3,687      
Equity investment ownership position     23.96% 23.96%   29.27%    
Shares issued by equity investee             37,391,763 37,391,763
Amount raised by equity investee on shares issued       1,196 527   3,100 1,870
Gain from the dilution of the ownership position   256   256        
Loss from equity method investment     68 396        
Carrying value of equity investment     2,561 2,561        
Quoted market value of equity investment     $ 7,049 $ 7,049