General Information - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2020	Oct. 29, 2020	Dec. 31, 2019
Significant Accounting Policies [Line Items]
Change in Accounting Principle, Accounting Standards Update, Adopted	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Immaterial Effect	true
Accounting Standards Update	us-gaap:AccountingStandardsUpdate201613Member
Assets held for sale	$ 2,000		$ 1,000
Subsequent Event [Member]
Significant Accounting Policies [Line Items]
Outstanding common stock owned by loews corporation		53.00%