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Schedule of Effective Tax Rate for Income Before Income Taxes (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule Of Effective Tax Rates [Line Items] |  |  |
Effective tax rates | (9.90%) | 74.50% | 19.70%
U.S. |  |  |
Schedule Of Effective Tax Rates [Line Items] |  |  |
Effective tax rates | 45.80% | 265.60% | 32.50%
Foreign |  |  |
Schedule Of Effective Tax Rates [Line Items] |  |  |
Effective tax rates | 16.40% | 6.30% | 8.90%

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