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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2019
Income Tax Contingency [Line Items]      
Gross unrecognized tax benefits, effective tax rate reduced $ 5,900    
Decrease in valuation allowance   $ 13,500  
Valuation allowance for deferred tax asset 12,892   $ 13,578
Net operating loss carryforwards, valuation allowance 7,200    
Undistributed earnings of subsidiaries 209,800    
Unrecognized deferred income tax liabilities 10,500    
Federal      
Income Tax Contingency [Line Items]      
Federal capital losses 7,200    
Net operating loss carryforwards, valuation allowance 5,700    
Net operating loss carryforwards 6,800    
State      
Income Tax Contingency [Line Items]      
Net operating loss carryforwards, valuation allowance 7,200    
Net operating loss carryforwards $ 8,600