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Income Taxes - Schedule of Reconciliation of Federal Statutory Rate to Company's Effective Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |  |
Federal income tax provision at statutory rate |  | 21.00% | 35.00% | 35.00%
State income taxes, net of federal income tax benefit |  | (15.90%) | (1.80%) | 7.00%
Foreign income tax rate differential |  | (18.90%) | (58.00%) | 24.40%
Tax effect of tax credits |  | 1.30% | (20.10%) |
Provision for (resolution of) tax matters |  | 46.50% | 27.80% | 0.40%
Rate changes due to enacted legislation |  | 7.20% | (1.30%) | 1.90%
State benefit due to enacted legislation |  |  | (8.20%) |
Effect of U.S. tax law change | [1] | (7.50%) | 107.50% |
Global Intangible Low-taxed Income |  | 33.80% |  |
Stock-based compensation |  | 10.00% | (0.20%) | 0.20%
Nondeductible officer's compensation |  | 5.20% |  |
Valuation allowance |  | 15.70% | 47.00% | (1.80%)
Other |  | 7.80% | 1.10% | (0.40%)
Actual tax rate |  | 106.20% | 128.80% | 66.70%
[1] | Due to the TCJA which was enacted in December 2017, provisional mandatory transition tax on accumulated foreign earnings was accrued as of December 31, 2017. Our U.S. deferred tax assets and liabilities as of December 31, 2017 were re-measured from 35% to 21%.

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