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Income Taxes - Reconciliation of the Federal Statutory Rate (Detail) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Income tax provision at federal statutory rate | 21.00% | 35.00% | 35.00%
Increase (decrease) in tax resulting from: |  |  |
State tax provision, net of federal benefit | 6.20% | 4.00% | 5.00%
Foreign tax rate differential | (0.20%) | (3.40%) | (4.40%)
Stock option compensation deduction | (1.10%) | 0.10% | 0.60%
Withholding taxes | 2.10% | 1.70% | 0.50%
Non-deductible expenses | 5.30% | 1.80% | 1.50%
Change in valuation allowance |  | 3.90% | 3.20%
Change in tax legislation | 1.90% | 5.80% |
Audit settlements |  | (4.00%) |
Other, net | (0.60%) | (0.20%) | 1.10%
Effective tax rate | 34.60% | 44.70% | 42.50%

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