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Income Taxes - Components of Current and Deferred Income Tax Expense (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 19,007 $ 14,515 $ 1,598
State and local 2,708 1,425 2,431
Foreign 440 567 210
Total current 22,155 16,507 4,239
Deferred:      
Federal 7,947 10,629 46,784
State and local 1,105 2,296 6,233
Foreign (214) (25) (123)
Total deferred 8,838 12,900 52,894
Income tax expense from operations $ 30,993 $ 29,407 $ 57,133