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Marketable Securities - Current - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Realized gains from disposal of marketable securities	$ 5,665	$ 6,299
Available for sale Securities Current
Schedule of Available-for-sale Securities [Line Items]
Unrealized gains for marketable securities	14,400	38,800
Realized gains from disposal of marketable securities	$ 2,300	$ 535	$ 0

This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity. 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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