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Commitments and Contingencies - Additional Information (Detail) - Claim
Claim in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Other Commitments [Line Items]        
Asbestos-related liability and asset measurement period 10 years      
Asbestos Related Matters [Member]        
Other Commitments [Line Items]        
Outstanding Active Pending Asbestos Claims 24 26 30 37
Percentage of asbestos liability related to pending claims 22.00%      
Percentage of Estimated Receivable from Insurers with A- or Better Credit Rating 79.00%      
Percentage of Asbestos Asset Related to Coverage in Place Agreements 62.00%