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Marketable Securities - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Securities Investments    
Schedule Of Marketable Securities [Line Items]    
Marketable securities, realized gains (losses) $ (11) $ (11)
Debt Securities Carried by EGL    
Schedule Of Marketable Securities [Line Items]    
Marketable securities, realized and unrealized gains (losses) (163) (123)
Mutual Funds    
Schedule Of Marketable Securities [Line Items]    
Marketable securities, realized and unrealized gains (losses) $ (9) $ 160