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Commitments and Contingencies - Legal Matters - Additional Information (Detail) | 6 Months Ended | 12 Months Ended | 186 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) Case | Dec. 31, 2014 USD ($) | Jun. 30, 2017 USD ($) Case | Dec. 31, 2016 Case
Commitments And Contingencies Disclosure [Abstract] |  |  |  |
Cumulative settlement payments for cases involving asbestos-related claims | $ |  | $ 500,000 | $ 1,200,000 |
Cumulative settlement payments made for cases involving asbestos-related claims with all legal fees other than corporate counsel expenses | $ |  |  | 1,100,000 |
Average cost per settled claim excluding legal fees | $ | $ 27,000 |  | $ 27,000 |
Number of claims pending | Case | 221 |  | 221 | 229
Number of new cases filed | Case | 27 |  |  |
Number of cases dismissed | Case | 30 |  |  |
Number of cases settled | Case | 5 |  |  |
Settlement recovering expense | $ |  | $ 200,000 |  |
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. |  |  |

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- Definition Describes management's process to evaluate the contingency matter and to estimate the impact on the financial statements and ongoing operations, such as added credit risk or loss of customers, including pertinent information to adequately disclose the matter and significant assumptions underlying the estimates. + 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 (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 9 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14557-108349 + Details
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