Quarterly report pursuant to Section 13 or 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
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]    
Gross realized gains $ 0 $ 0
Gross realized losses $ 0 $ (155)