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Federal, State and Local Taxes - Changes in Liability for Unrecognized Gross Tax Benefits (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]      
Uncertain tax positions at beginning of year $ 35,749 $ 33,357 $ 33,681
Additions for tax positions relating to current-year operations 830 925  
Additions for tax positions relating to prior tax years 1,547 2,036 1,660
Subtractions for tax positions relating to prior tax years (306) (569) (1,984)
Uncertain tax positions at end of year $ 37,820 $ 35,749 $ 33,357