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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Income Loss From Operations Before Provision Benefit For Income Taxes [Line Items]          
Windfall benefit     $ 4,600    
Shortfall expense       $ 6,900  
Income (loss) from continuing operations before income taxes $ 21,293 $ (18,072) $ 56,646 $ (74,561)  
Cumulative operating income loss period considered     3 years    
Unrecognized income tax benefits $ 29,900   $ 29,900   $ 28,900
U.S. and Foreign Net Operating Loss Carryforwards [Member]          
Income Loss From Operations Before Provision Benefit For Income Taxes [Line Items]          
Valuation allowance     $ 700