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Income Taxes - Deferred Taxes - Additional Information (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Income Tax [Line Items] |  |
Deferred tax assets, operating loss carryforwards | $ 1.5 |
Deferred tax assets, valuation allowance | 294.8 | $ 325.3
Valuation allowance, deferred tax asset, change in amount | 35.2 | 34.3
Valuation allowances and reserves deductions | $ 30.5 | $ 17.9
Tax credit carryfoward, expiration range | 2020 |
Deferred tax asset, operating loss carryforwards, foreign (do not expire) | $ 973.0 |
Deferred tax assets, operating loss carryforwards, subject to expiration | 572.0 |
U.S. Federal NOL's [Member] |  |
Income Tax [Line Items] |  |
Deferred tax assets, operating loss carryforwards | 296.0 |
U.S. Federal NOL's [Member] | NOL Not Utilized in the Current Year [Member] |  |
Income Tax [Line Items] |  |
Deferred tax assets, operating loss carryforwards | 289.0 |
U.S. Federal NOL's [Member] | NOL Utilized in the Current Year [Member] |  |
Income Tax [Line Items] |  |
Deferred tax assets, operating loss carryforwards | $ 31.0 |
Minimum [Member] |  |
Income Tax [Line Items] |  |
Operating loss carryforwards, expiration date | Jan. 01, 2018 |
Maximum [Member] |  |
Income Tax [Line Items] |  |
Operating loss carryforwards, expiration date | Dec. 31, 2037 |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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