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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Components Of Income Tax Expense Benefit [Line Items] |  |  |
Income tax effective rate | 50.70% |  | 242.80%
Income tax expense (benefit) impact of the tax act | $ (0.5) | $ 8.3 |
Minimum [Member] |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |
Decrease in unrecognized tax benefits | 2.1 |  |
Maximum [Member] |  |  |
Components Of Income Tax Expense Benefit [Line Items] |  |  |
Decrease in unrecognized tax benefits | $ 4.1 |  |

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- Definition Tax cuts and jobs act of 2017 change in tax rate income tax expense benefit. + References No definition available. + Details
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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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