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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Income Tax [Line Items]          
Net deferred income tax assets $ 47.2   $ 47.2   $ 48.0
Reduction in valuation allowance 0.8        
Income tax rate non deductible legal settlement $ 2.4   $ 2.4    
Effective tax rate increased 132.50%   7.10%    
Decrease in effective tax rate   2.10%   6.70%  
Decrease in unrecognized tax positions $ 1.5   $ 1.5    
Interest and penalties 1.6   1.6    
Florida [Member]          
Income Tax [Line Items]          
Increase in tax expense (benefit) $ (0.5)   $ (0.5)    
Decrease in effective tax rate due to settlement of a state income tax audit, percentage (28.20%)   (1.50%)