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Consolidated Income Tax Expense (benefit) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current      
Federal $ 21,316 $ 51,489 $ 58,090
State 4,327 10,307 8,627
Foreign 155 144 54
Current Income Tax Expense (Benefit), Total 25,798 61,940 66,771
Deferred      
Federal (16,065) 3,448 (7,930)
State 1,459 686 288
Foreign (76) (90) (107)
Deferred Income Tax Expense (Benefit), Total (14,682) 4,044 (7,749)
Total consolidated expense $ 11,116 $ 65,984 $ 59,022