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Changes in Liability for Unrecognized Gross Tax Benefits (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Contingency [Line Items]      
Uncertain tax positions at beginning of year $ 33,681 $ 33,487 $ 30,456
Additions for tax positions relating to current-year operations 0 4,332 1,304
Additions for tax positions relating to prior tax years 1,660 1,398 1,997
Subtractions for tax positions relating to prior tax years (1,984) (5,101) (270)
Reductions in balance due to settlements 0 (435) 0
Uncertain tax positions at end of year $ 33,357 $ 33,681 $ 33,487