Annual report pursuant to Section 13 and 15(d)

Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail)

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Income Taxes - Reconciliation of Unrecognized Tax Benefits (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Income Tax Disclosure [Abstract]    
Beginning balance $ 7,975 $ 7,381
Additions for current year tax positions 1,795 1,161
Additions for prior year tax positions 1,638  
Reductions for prior year tax positions   (55)
Reductions related to lapse of statute of limitations (842) (512)
Ending balance $ 10,566 $ 7,975