Annual report pursuant to Section 13 and 15(d)

Investments in Marketable Securities - Amortized Cost and Fair Value of Investments in Available for Sale Securities (Detail)

v3.3.1.900
Investments in Marketable Securities - Amortized Cost and Fair Value of Investments in Available for Sale Securities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Available-for-sale Securities, Continuous Unrealized Loss Position [Abstract]    
Available for sale securities continuous unrealized loss position for less than 12 months, unrealized loss $ (951) $ (19)
Available for sale securities continuous unrealized loss position for 12 months or longer, unrealized loss 0 0
Available for sale securities continuous unrealized loss position for less than 12 months, fair value 129,117 5,363
Available for sale securities continuous unrealized loss position for 12 months or longer, fair value $ 0 $ 0