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Income Taxes - Reconciliation (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes |  |  |
Income tax expense at U.S. federal statutory rate | 21.00% | 21.00% | 35.00%
State and local income taxes, net of federal income tax benefit | 4.39% | 4.41% | 3.25%
Impacts of enactment of tax reform |  | (0.51%) | (24.14%)
Federal tax credits | (4.38%) | (2.44%) | (2.31%)
Taxing authority audit settlements and other tax adjustments | (0.74%) | (3.85%) | 0.03%
Tax impact of equity-based compensation transactions | (0.91%) | (0.54%) | (1.45%)
Tax impact of impairments | 0.72% | 0.03% | 0.66%
Tax rate differential on foreign income | 0.40% | 0.43% | (0.55%)
Other | 0.13% | 0.51% | 0.55%
Effective income tax rate | 20.61% | 19.04% | 11.04%

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