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Income Taxes - Reconciliation of Pre-Tax Income (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Federal statutory tax rate | 21.00% | 21.00% | 35.00%
Foreign rate differential | 4.00% |  | (5.00%)
State taxes, net of federal benefit | 3.00% | 3.00% | 2.00%
Non-deductible expenses | 1.00% | 2.00% | 2.00%
Reserves for uncertain tax positions | 1.00% |  | (2.00%)
Credits and exemptions | (4.00%) | (2.00%) | (3.00%)
Outside basis differences recognized as a result of a legal entity restructuring | (20.00%) |  |
Tax Reform |  | 1.00% | 12.00%
Change in valuation allowance |  | (1.00%) | (2.00%)
Acquisition-related costs |  | (2.00%) |
Other | (1.00%) | 1.00% | 1.00%
Effective tax rate | 5.00% | 23.00% | 40.00%

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