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Income taxes - Reconciliation of Effective Tax Rate (Detail) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
U.S. statutory tax rate | 21.00% | 21.00% | 35.00%
Increase (decrease) in taxes resulting from: |  |  |
State taxes (net of federal income tax benefit) | 3.10% | 2.90% | 2.40%
Domestic manufacturing deduction | 0.00% | 0.00% | (3.00%)
Uncertain tax positions, settlements and lapse of statutes of limitations | (1.60%) | (0.30%) | (0.90%)
Valuation allowances, tax rate changes, & other deferred adjustments | (1.70%) | (1.00%) | (6.30%)
Valuation allowance on equity method investment | 1.70% | 0.00% | 0.00%
Enactment of the Tax Cuts and Jobs Act | 0.00% | (1.10%) | (70.90%)
Non-deductible transactions costs | 0.30% | 0.00% | 1.20%
Net excess benefits or expense on share-based payments | 0.40% | 0.10% | (0.40%)
Other, net | 0.60% | (0.50%) | (1.30%)
Effective tax rate | 23.80% | 21.10% | (44.20%)

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