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Income Taxes - Effective Income Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |
U.S. federal statutory rate on income before income taxes | 21.00% | 21.00% | 21.00% | 35.00%
Impact of foreign operations | (0.50%) | 1.10% | 0.60% |
Effects of statutory rate change | 3.20% |  |  |
Impacts of SAB 118 |  |  | (16.4) |
State income taxes, net of federal tax effect | 5.10% | 5.80% | 3.40% |
Permanent differences | 1.50% | 3.30% | 9.20% |
Change in valuation allowance | 127.40% | 0.60% | (0.30%) |
Unrecognized tax benefit release | (0.40%) | 0.50% | (0.90%) |
Federal tax credits | (1.00%) | (2.20%) | (2.30%) |
Basis recognition related to foreign divestiture | (129.90%) |  |  |
CARES Act impacts to net operating losses | (4.50%) |  |  |
Other | 0.20% | 1.90% | 0.40% |
Effective income tax rate | 22.10% | 32.00% | 14.70% |

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