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Investments and Marketable Securities - Schedule of Realized Gains on Sales of Available-for-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Available-for-sale Securities [Abstract]
Proceeds	$ 644,378us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities	$ 336,741us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities	$ 164,410us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Realized gains	1,100us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	727us-gaap_AvailableForSaleSecuritiesGrossRealizedGains	423us-gaap_AvailableForSaleSecuritiesGrossRealizedGains
Realized losses	(833)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses	(81)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses	(78)us-gaap_AvailableForSaleSecuritiesGrossRealizedLosses
Net realized gains included in other comprehensive income (loss) as of the end of the prior year	$ 4us-gaap_RealizedInvestmentGainsLosses	$ 603us-gaap_RealizedInvestmentGainsLosses	$ 285us-gaap_RealizedInvestmentGainsLosses

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This item represents the gross profit realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 9

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This item represents the gross loss realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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The net realized gains or losses on investments during the period, not including gains or losses on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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