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, 2015
Dec. 31, 2014
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]    
Gross realized gain $ 135 $ 0
Gross realized loss $ (3) $ 0