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Contingencies - Additional Information (Detail) $ in Millions | 5 Months Ended |  |
--- | --- | --- | ---
Jul. 31, 2018 Claim | Sep. 30, 2018 USD ($) | Dec. 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |
Number of arbitration claims filed | Claim | 325 |  |
Other Accrued Expenses [Member] |  |  |
Loss Contingencies [Line Items] |  |  |
Accrual for legal fees and settlements | $ |  | $ 0.9 | $ 8.7

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- Definition Amount of loss contingency liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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