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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Dec. 31, 2018
Annual effective tax rate ("ETR") from continuing operations (12.20%) 5.80% 2.60% 9.60% 11.70% 23.19%
Federal statutory rate     21.00%   21.00% 21.00%
Income tax benefits $ 3,348 $ (412) $ (1,563) $ (1,308) $ (3,121) $ (4,968)
Net deferred tax assets, valuation allowance $ 7,400   $ 7,400   $ 331 $ 122
Percentage Of Annual Taxable Income On Use Of Net Operating Loss Carryforwards         80.00%  
Income Tax Examination, Description         The Company's federal income tax returns remain subject to examination for the 2016 through 2019 tax years. The Company files in multiple state jurisdictions which remain subject to examination for the 2015 through 2019 tax years.  
Domestic Tax Authority [Member]            
Operating Loss Carryforwards         $ 15,700  
Loss Carryforwards Not Subject To Expiration         7,000  
State and Local Jurisdiction [Member]            
Operating Loss Carryforwards         $ 10,400