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Goodwill and Intangible Assets - Additional Information (Detail) (USD $)
1 Months Ended 6 Months Ended
Mar. 31, 2012
Feb. 29, 2012
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Goodwill and Intangible Assets Disclosure [Line Items]          
Aggregate amortization expense on intangible assets     $ 1,793,000 $ 2,010,000  
Goodwill     29,128,000   29,203,000
Decrease in goodwill due to foreign currency fluctuations     (75,000)    
Gross goodwill before impairments     30,248,000   30,323,000
Proceeds from sales of intangible assets 19,900,000 6,961,000 26,861,000    
Net book value of intangible assets sold 20,244,000        
Pre-tax net gain from sale of intangible assets     $ 6,602,000