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Income Taxes - Components of Income Tax Provision (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ 53,962 $ 50,645 $ 61,830
State and local 8,278 8,105 7,402
Total current expense (benefit) 62,240 58,750 69,232
Deferred:      
Federal 851 4,106 (775)
State and local 458 617 82
Total deferred expense (benefit) 1,309 4,723 (693)
Income tax expense $ 63,549 $ 63,473 $ 68,539