Annual report pursuant to Section 13 and 15(d)

Investments in Marketable Securities - Schedule of Amortized Cost and Fair Value of Marketable Securities, Available-for-Sale, by Contractual Maturity (Detail)

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Investments in Marketable Securities - Schedule of Amortized Cost and Fair Value of Marketable Securities, Available-for-Sale, by Contractual Maturity (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]    
Due in one year or less, Amortized Cost $ 79,943  
Due after one year through five years, Amortized Cost 28,634 $ 4,679
Due after five years through ten years, Amortized Cost 18,020 5,652
Due after ten years, Amortized Cost 8,604 4,381
Amortized Cost 135,201 14,712
Due in one year or less, Fair Value 79,860  
Due after one year through five years, Fair Value 28,465 4,679
Due after five years through ten years, Fair Value 17,466 5,662
Due after ten years, Fair Value 8,464 4,411
Total Fair Value $ 134,255 $ 14,752
Weighted average maturity 3 years 3 months 18 days 9 years 7 months 6 days