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Income taxes - Provision (Benefit) for Income Taxes on Income from Continuing Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current
Federal	$ 59,791	$ 77,795	$ 81,355
State and other	7,567	9,527	7,981
Total	67,358	87,322	89,336
Deferred
Federal	21,345	15,765	(214,539)
State and other	719	4,280	(12,043)
Total	22,064	20,045	(226,582)
Total
Federal	81,136	93,560	(133,184)
State and other	8,286	13,807	(4,062)
Total	$ 89,422	$ 107,367	$ (137,246)

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