Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Name:	us-gaap_IncomeTaxExpenseBenefit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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, 2020
Income Taxes [Line Items]
Income tax (benefit) expense	$ 2,401	$ (735)	$ 2,658	$ (73)
Effective income tax rate			26.00%	0.50%
Scenario, Forecast [Member]
Income Taxes [Line Items]
Effective income tax rate					25.00%