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Reconciliation of Income Tax Provision at Statutory Income Tax Rate and Effective Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation Of Provision Of Income Taxes [Line Items] |  |  |
Statutory federal rate | 21.00% | 21.00% | 35.00%
Dividends paid deduction | (18.90%) | (18.60%) | (31.30%)
State taxes, net of federal tax benefit | 1.20% | 1.00% | 1.20%
Permanent differences | 1.20% | 1.00% | 0.60%
Charges associated with adoption of tax reform |  | 0.60% | 2.40%
Tax benefit of equity-based compensation | 0.10% | 0.50% | (0.50%)
Other items, net | (0.60%) | (0.50%) | (0.20%)
Effective income tax rate, Total | 4.00% | 5.00% | 7.20%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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