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Marketable Securities - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Securities Investments [Member]
Schedule Of Marketable Securities [Line Items]
Marketable securities, realized gains (losses)	$ 856	$ (45)	$ (85)
Debt Securities Carried by EGL [Member]
Schedule Of Marketable Securities [Line Items]
Marketable securities, realized and unrealized gains (losses)	(550)	(234)	(674)
Mutual Funds [Member]
Schedule Of Marketable Securities [Line Items]
Marketable securities, realized and unrealized gains (losses)	$ 138	$ 1,344	$ 1,025

This item represents the net total realized and unrealized gain (loss) included in earnings for the period as a result of selling or holding marketable securities categorized as trading, available-for-sale, or held-to-maturity, including the unrealized holding gain (loss) of held-to-maturity securities transferred to the trading security category and the cumulative unrealized gain (loss) which was included in other comprehensive income (a separate component of shareholders' equity) for available-for-sale securities transferred to trading securities during the period. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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