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Contingencies - Additional Information (Detail) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Site Contingency [Line Items] |  |
Environmental and legal losses | $ 25,800,000 | $ 25,800,000
Cash outlays related to legal and environmental matters | $ 400,000 | $ 300,000
Contribution for future response costs | 5.00% |
Payment of environmental response costs | $ 2,500,000 |
Minimum [Member] |  |
Site Contingency [Line Items] |  |
Environmental and legal losses | 25,600,000 |
Maximum [Member] |  |
Site Contingency [Line Items] |  |
Environmental and legal losses | $ 46,300,000 |

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- Definition Life to date payments for environmental remediation response activities. + References No definition available. + Details
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- Definition Reflects the estimated amount of loss from the specified contingency as of the balance sheet date. + 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=25496072&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=25496072&loc=d3e14557-108349 + Details
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- Definition The amount of cash paid for the settlement of litigation or for other legal issues during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3536-108585 + Details
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