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Marketable Securities Amortized Cost and Estimated Fair Value of Marketable Securities (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Securities Investments    
Cost $ 49,285 $ 46,158
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 294 259
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 2,714 2,630
Fair Value 46,865 43,787
Securities Investments    
Securities Investments    
Cost 6,463 6,463
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 17 10
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 2,603 2,523
Fair Value 3,877 3,950
Debt Securities Carried by EGL    
Securities Investments    
Cost 40,530 37,404
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 133 94
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 14 8
Fair Value 40,649 37,490
Mutual Funds    
Securities Investments    
Cost 2,292 2,291
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 144 155
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 97 99
Fair Value $ 2,339 $ 2,347