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 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]        
Gross realized gain $ 16 $ 0 $ 36 $ 133
Gross realized loss $ 0 $ 0 $ (155) $ (3)