Annual report pursuant to Section 13 and 15(d)

Investments in Marketable Securities - Gross Realized Gains and Losses from Sale of Available for Sale Securities (Detail)

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Investments in Marketable Securities - Gross Realized Gains and Losses from Sale of Available for Sale Securities (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]      
Gross realized gains $ 134 $ 12 $ 2
Gross realized losses $ (47) $ (2) $ 0