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Property, Plant and Equipment - Additional Information (Detail) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 10,180,000 $ 10,546,000 $ 11,083,000
Capital expenditure commitments $ 936,000    
Maximum [Member]
      
Property, Plant and Equipment [Line Items]      
Depreciation and amortization period 39 years    
Minimum [Member]
      
Property, Plant and Equipment [Line Items]      
Depreciation and amortization period 3 years