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Marketable Securities Amortized Cost and Estimated Fair Value of Marketable Securities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Securities Investments    
Cost $ 68,891 $ 46,158
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1,416 259
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 3,829 2,630
Fair Value 66,478 43,787
Securities Investments    
Securities Investments    
Cost 6,483 6,463
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 14 10
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 3,727 2,523
Fair Value 2,770 3,950
Debt Securities Carried by EGL    
Securities Investments    
Cost 37,559 37,404
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 90 94
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 4 8
Fair Value 37,645 37,490
investment Funds [Member]    
Securities Investments    
Cost 24,849 2,291
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1,312 155
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 98 99
Fair Value $ 26,063 $ 2,347