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Other - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Certain Asset Accounts [Line items]      
Depreciation and amortization expense $ 7,800,000 $ 7,500,000 $ 8,200,000
Purchase consideration paid     2,500,000
Business acquisition adjusted book value of acquired assets     0
Business acquisition goodwill     (2,500,000)
Extraordinary gain     2,500,000
Accumulated depreciation and amortization
      
Certain Asset Accounts [Line items]      
Accumulated Depreciation and amortization 1,900,000 1,900,000  
Machinery, furniture and equipment
      
Certain Asset Accounts [Line items]      
Accumulated Depreciation and amortization $ 2,100,000 $ 2,100,000