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Income taxes - Reconciliation of Effective Tax Rate (Detail)	12 Months Ended
	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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