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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Effective income tax percentage |  | 21.00% |  |  | 35.00% | 35.00% | 35.00%
Statutory tax rate, including state and local taxes |  | 25.90% |  |  | 39.00% |  |
Income tax expense |  | $ 5.8 | $ 3.8 |  | $ (49.6) | $ 6.7 | $ 4.3
Unrecognized tax benefits | $ 1.3 | 1.3 |  |  | 1.5 |  |
Accrued Interest included in unrecognized tax benefits | 0.2 | 0.2 |  |  | 0.4 |  |
Unrecognized tax benefits if recognized would impact on effective income tax rate | 1.3 | $ 1.3 |  |  |  |  |
Income tax examination description |  | With a few exceptions, we are no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2014. |  |  |  |  |
Tax benefit recognized from consolidation of financial statement |  |  |  |  | 59.4 |  |
Decrease of the net deferred tax asset and the recognition of a tax expense |  |  |  |  | 28.0 |  |
Recognition of tax benefit due to revaluation of valuation allowance |  |  |  |  | 54.4 |  |
Untaxed foreign earnings |  |  |  |  | 74.3 |  |
Tax expense |  |  |  |  | 26.0 |  |
Foreign earnings resulting in a tax benefit |  |  |  |  | 26.0 |  |
Deferred tax liability, tax benefit |  |  |  |  | 20.9 |  |
Increase of the valuation allowance and a tax expense |  |  |  |  | $ 20.9 |  |
Tax Credit Carryforward, Description |  |  |  |  | The Tax Act changes the current 20-year carryover period for a net operating loss ("NOL") to an indefinite carryover period for NOL's incurred after December 31, 2017. |  |
Net federal tax benefit, available from the loss carryovers |  |  |  |  | $ 70.5 |  |
Federal tax credit carryovers |  |  |  |  | 0.3 |  |
State tax credit carryovers benefit |  |  |  |  | 29.7 |  |
Federal net operating loss tax benefit, amount |  |  |  |  | 1.0 |  |
Valuation allowance |  |  |  |  | 90.7 | $ 159.9 |
Accrued interest and penalty |  |  |  |  | $ 0.4 |  |
Amount of unrecognized tax benefits |  |  |  |  | Of the total amount of unrecognized tax benefits, $1.5 represents the amount that, if recognized, would impact our effective income tax rate as of December 31, 2017. |  |
Overseas earnings available for reinvestment |  |  |  |  | $ 234.5 |  |
Deferred tax liability for the expected tax cost of repatriating such earnings |  |  |  |  | 5.1 |  |
Valuation Allowance [Member] |  |  |  |  |  |  |
Decrease of the valuation allowance and a tax expense |  |  |  |  | $ 33.0 |  |
Scenario, Plan [Member] |  |  |  |  |  |  |
Effective income tax percentage |  |  |  | 21.00% |  |  |
Research Tax Credit Carryforward [Member] |  |  |  |  |  |  |
Tax credit carryforward, expiration date |  |  |  |  | Dec. 31, 2027 |  |
Tax Cutsand Jobs Actof 2017 [Member] |  |  |  |  |  |  |
Income tax expense | 0.0 |  |  |  |  |  |
Increase in includible untaxed foreign earnings | 16.2 |  |  |  |  |  |
Tax benefit utilaization | 16.2 |  |  |  |  |  |
Tax Cutsand Jobs Actof 2017 [Member] | Foreign Income [Member] |  |  |  |  |  |  |
Income tax expense | 5.7 |  |  |  |  |  |
Tax Cutsand Jobs Actof 2017 [Member] | Operating Loss Carryforwards [Member] |  |  |  |  |  |  |
Income tax expense | $ (5.7) |  |  |  |  |  |
Earliest Tax Year [Member] |  |  |  |  |  |  |
Tax credit carryforward, expiration date |  |  |  |  | Dec. 31, 2021 |  |
Latest Tax Year [Member] |  |  |  |  |  |  |
Tax credit carryforward, expiration date |  |  |  |  | Dec. 31, 2029 |  |
Previously Reported [Member] |  |  |  |  |  |  |
Unrecognized tax benefits |  |  |  |  | $ 1.5 |  |

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