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Income Taxes - Income Tax Expense Attributable to Total Income Before Income Taxes (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:                      
Federal                 $ 4,479 $ 11,431 $ 13,037
State and local                 821 1,584 1,859
Current total                 5,300 13,015 14,896
Deferred:                      
Federal                 4,464 1,694 (104)
State and local                 530 208 (18)
Deferred total                 4,994 1,902 (122)
Total $ 923 $ 3,235 $ 3,751 $ 2,385 $ 4,014 $ 4,020 $ 3,668 $ 3,215 $ 10,294 $ 14,917 $ 14,774