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Commitments and Contingencies - Legal Matters - Additional Information (Detail) (USD $)
 0 Months Ended 3 Months Ended 9 Months Ended
Jan. 14, 2013
Feb. 15, 2012
Sep. 30, 2013
Cases
Sep. 30, 2013
Cases
Dec. 31, 2012
Cases
Oct. 12, 2012
Commitment And Contingencies [Abstract]            
Cumulative settlement payments for cases involving asbestos-related claims       $ 740,000    
Average cost per settled claim excluding legal fees     25,000 25,000    
Number of claims pending     175 175 153  
Number of new cases filed     43      
Number of cases dismissed     21      
Number of cases settled     0      
Liability for amount completely withdrawn from the Unions Pension Trust Fund           5,300,000
Plaintiffs claim to have suffered property damages and other loss       75,000,000    
Loss contingency damages sought value from third plaintiffs 1,000,000          
Loss contingency damages sought value from two plaintiffs 5,000,000          
Company's stock worth   21,000        
Plaintiffs' legal costs   106,000        
Accruals for estimated losses     $ 2,500,000 $ 2,500,000    
Assessment regarding Loss contingency impact Description       We are not aware of pending claims or assessments, other than as described above, which may have a material adverse impact on our liquidity, financial position, results of operations, or cash flows.