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Marketable Securities - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Securities Investments        
Schedule Of Marketable Securities [Line Items]        
Marketable securities, realized gains (losses) $ (10) $ (12) $ (21) $ (23)
Debt Securities Carried by EGL        
Schedule Of Marketable Securities [Line Items]        
Marketable securities, realized and unrealized gains (losses) (175) (187) (339) (310)
investment Funds [Member]        
Schedule Of Marketable Securities [Line Items]        
Marketable securities, realized and unrealized gains (losses) $ 534 $ (4) $ 525 $ 156