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Selected Quarterly Financial Data (Unaudited) - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract] |  |  |  |
Estimated one-time tax provision |  | $ 44.0 |  | $ 44.0
Provision for transition tax |  | 40.3 | $ 37.2 | 40.3
Tax provision charge related to re-measurement of net deferred tax assets |  | $ 3.7 |  | $ 3.7
Measurement period adjustment to reduce transition tax | $ 3.1 |  | $ 3.1 |

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- Definition Estimated one-time tax provision as a result of the Tax Cuts and Jobs Act enacted in 2017. + References No definition available. + Details
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- Definition Measurement period adjustment to reduce transition tax related to Tax Cuts and Jobs Act enacted in 2017. + References No definition available. + Details
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- Definition Tax cuts and jobs act of 2017 provision for transition tax. + References No definition available. + Details
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- Definition Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- References No definition available. + Details
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