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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes [Line Items]      
Valuation allowance $ 16.3 $ 15.1  
Net federal tax benefit, available from the loss carryovers 83.2    
Federal tax credit carryovers 0.2    
Federal net operating loss 53.6    
State net operating loss tax benefit, amount 34.2    
Foreign net operating loss tax benefit, amount $ 8.5    
Income tax examination description With a few exceptions, we are no longer subject to U.S. federal, state and local, or non-U.S. income tax examinations by tax authorities for years before 2016.    
Unrecognized tax benefits $ 1.8 $ 1.5 $ 1.3
Accrued interest and penalty included in unrecognized tax benefits 0.3    
Unrecognized tax benefits if recognized would impact on effective income tax rate $ 1.8    
Earliest Tax Year [Member]      
Income Taxes [Line Items]      
Federal net operating loss expiration period Dec. 31, 2031    
Latest Tax Year [Member]      
Income Taxes [Line Items]      
Federal net operating loss expiration period Dec. 31, 2037    
Indefinite Period [Member]      
Income Taxes [Line Items]      
Federal net operating loss $ 29.6    
State [Member]      
Income Taxes [Line Items]      
Valuation allowance $ 16.3    
Federal [Member] | Foreign Tax Credit Carryforward [Member]      
Income Taxes [Line Items]      
Tax credit carryforward, expiration date Dec. 31, 2021    
Federal [Member] | Research Tax Credit Carryforward [Member]      
Income Taxes [Line Items]      
Tax credit carryforward, expiration date Dec. 31, 2027    
Tax Cut and Jobs Act of 2017 [Member]      
Income Taxes [Line Items]      
Unremitted foreign earnings $ 288.7    
Unremitted earnings consider to be indefinitely reinvested 236.0    
Unremitted earnings not considered indefinitely reinvested 52.7    
Deferred tax liability for the expected tax cost of repatriating earnings 2.6    
Withholding tax expense $ 11.0