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Changes in Liability for Unrecognized Gross Tax Benefits (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Contingency [Line Items]      
Uncertain tax positions at beginning of year $ 33,357 $ 33,681 $ 33,487
Additions for tax positions relating to current-year operations 925   4,332
Additions for tax positions relating to prior tax years 2,036 1,660 1,398
Subtractions for tax positions relating to prior tax years (569) (1,984) (5,101)
Reductions in balance due to settlements     (435)
Uncertain tax positions at end of year $ 35,749 $ 33,357 $ 33,681