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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)