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Fair Value Measurements - Additional Information (Detail) (USD $)	12 Months Ended			0 Months Ended	3 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Oct. 01, 2011	Dec. 31, 2014	Sep. 30, 2014
Schedule Of Fair Value Measurements [Line Items]
Impairment loss on investment included in other comprehensive income (loss)	$ 412,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss	$ 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss
Impairment loss on investment included in earnings	630,000us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1	0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1
Proceeds from sale of securities	644,378,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities	336,741,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities	164,410,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Auction Rate Security [Member]
Schedule Of Fair Value Measurements [Line Items]
Impairment loss on investment included in other comprehensive income (loss)				(412,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInOtherComprehensiveIncomeLoss / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember
Impairment loss on investment included in earnings						(600,000)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetGainLossIncludedInEarnings1 / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember
Proceeds from sale of securities					2,400,000us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember
Loss on sale of securities					$ (30,000)us-gaap_GainLossOnSaleOfSecuritiesNet / us-gaap_InvestmentTypeAxis = us-gaap_AuctionRatePreferredSecuritiesMember

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- Definition

Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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- Definition

Amount of gain (loss) recognized in other comprehensive income (loss) for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

+ References

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

-Publisher FASB

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-Topic 820

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- Definition

The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

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-Subparagraph (SX 210.9-04.13(h))

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-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 13

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-Name Accounting Standards Codification

-Topic 944

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- Definition

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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