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Marketable Securities - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Securities Investments        
Schedule Of Marketable Securities [Line Items]        
Marketable securities, realized gains (losses) $ (12) $ (12) $ (33) $ (35)
Debt Securities Carried by EGL        
Schedule Of Marketable Securities [Line Items]        
Marketable securities, realized and unrealized gains (losses) (341) (32) (680) (342)
investment Funds [Member]        
Schedule Of Marketable Securities [Line Items]        
Marketable securities, realized and unrealized gains (losses) $ 707 $ (222) $ 1,232 $ (66)