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Property, Plant and Equipment - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Property, Plant and Equipment [Line Items]      
Depreciation expense $ 9,028,000 $ 9,833,000 $ 10,180,000
Capital expenditure commitments $ 1,089,000    
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