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Other - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Certain Asset Accounts [Line items]      
Depreciation and amortization expense $ 7,700,000us-gaap_Depreciation $ 7,700,000us-gaap_Depreciation $ 7,800,000us-gaap_Depreciation
Machinery, furniture and equipment 85,556,000us-gaap_MachineryAndEquipmentGross 79,132,000us-gaap_MachineryAndEquipmentGross  
Accumulated Depreciation and amortization 89,623,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment 80,201,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment  
Assets Held under Capital Leases      
Certain Asset Accounts [Line items]      
Machinery, furniture and equipment 2,100,000us-gaap_MachineryAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
2,100,000us-gaap_MachineryAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
 
Accumulated Depreciation and amortization $ 2,000,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember
$ 1,900,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetsHeldUnderCapitalLeasesMember