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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Schedule Of Income Tax [Line Items]    
Corporate tax rate   35.00%
Net operating losses, state   $ 74.3
Net operating losses expiration date   2037
Net operating losses, federal   $ 5.5
Income tax expense benefit due to change in tax rate   $ 59.7
Scenario, Forecast [Member]    
Schedule Of Income Tax [Line Items]    
Corporate tax rate 21.00%