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Basis of Presentation and Summary of Significant Accounting Policies - Income Taxes (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Basis of Presentation and Summary of Significant Accounting Policies |  |  |  |
Effective corporate income tax rate |  | 35.00% | 35.00% | 35.00%
Estimate reduce value of deferred tax asset |  | $ (0.6) |  |
Scenario, Forecast |  |  |  |
Basis of Presentation and Summary of Significant Accounting Policies |  |  |  |
Effective corporate income tax rate | 21.00% |  |  |

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