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Commitments and Contingencies - Legal Matters - Additional Information (Detail)
3 Months Ended 195 Months Ended
Mar. 31, 2018
USD ($)
Case
Mar. 31, 2018
USD ($)
Case
Dec. 31, 2017
Case
Commitments And Contingencies Disclosure [Abstract]      
Cumulative settlement payments for cases involving asbestos-related claims | $   $ 2,900,000  
Cumulative settlement payments made for cases involving asbestos-related claims with all legal fees other than corporate counsel expenses | $   2,800,000  
Average cost per settled claim excluding legal fees | $ $ 37,000 $ 37,000  
Number of claims pending 180 180 218
Number of new cases filed 16    
Number of cases dismissed 15    
Number of cases settled 39    
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.