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Commitments and Contingencies - Activity Related to Asbestos Claims (Detail) - Asbestos Related Matters [Member] - Claim Claim in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Number of Pending Claims [Roll Forward] |  |  |
Pending claims - Beginning | 30 | 37 | 62
New claims | 4 | 4 | 4
Settlements | (2) | (1) | (1)
Dismissals | (6) | (10) | (28)
Pending claims - Ending | 26 | 30 | 37
Active [Member] |  |  |
Number of Pending Claims [Roll Forward] |  |  |
Pending claims - Ending | 26 |  |

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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 + Details
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