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Income Taxes - Summary of Income Tax Expense (Benefit) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Federal Income Tax $ 5,083 $ 4,131 $ 50
State and Local Income Tax 1,749 2,777 3,576
Foreign Income Tax 587 191 331
Total Current 7,419 7,099 3,957
Federal Income Tax 28,607 2,376 (3,698)
State and Local Income Tax 2,354 (20) (17)
Foreign Income Tax   (63) (3)
Deferred Income Tax Expense (Benefit) 30,961 2,293 (3,718)
Provision for Taxes $ 38,380 $ 9,392 $ 239