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)

v3.6.0.2
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, 2016
Dec. 31, 2015
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]    
Gross realized gain $ 43 $ 135
Gross realized loss $ (166) $ (3)