v2.4.0.8
Goodwill and Intangible Assets, Net - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Dec. 31, 2011
Goodwill And Intangible Assets [Line Items]            
Amortization expense $ 709 $ 756 $ 2,143 $ 2,270 $ 3,027 $ 1,260
Total amortization expense, 2013         2,853  
Total amortization expense, 2014         2,641  
Total amortization expense, 2015         2,641  
Total amortization expense, 2016         2,641  
Total amortization expense, 2017         2,641  
Total amortization expense, thereafter         16,098  
Goodwill 13,846   13,846   0  
Accumulated impairment losses $ 0   $ 0   $ 0  
Weighted Average [Member] | Patents and Related Technologies [Member]
            
Goodwill And Intangible Assets [Line Items]            
Weighted average useful life     12 years 4 months 24 days   12 years 4 months 24 days  
Weighted Average [Member] | Favorable Rent Asset [Member]
            
Goodwill And Intangible Assets [Line Items]            
Weighted average useful life         3 years 4 months 24 days