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Fair Value Measurements (Schedule Of Available For Sale Securities) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair Value Option Qualitative Disclosures Related To Election [Line Items]
Cost	$ 16,638us-gaap_AvailableForSaleSecuritiesAmortizedCost	$ 8,442us-gaap_AvailableForSaleSecuritiesAmortizedCost
Gross unrealized losses	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Gross Unrealized Gains	1,609us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains	1,283us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Fair value	18,247us-gaap_AvailableForSaleSecurities	9,725us-gaap_AvailableForSaleSecurities
Available-for-sale Securities [Member]
Fair Value Option Qualitative Disclosures Related To Election [Line Items]
Cost	369us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember	659us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember
Gross unrealized losses	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember
Gross Unrealized Gains	1,609us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember	1,283us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember
Fair value	1,978us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember	1,942us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_AvailableforsaleSecuritiesMember
Cost-method Investments [Member]
Fair Value Option Qualitative Disclosures Related To Election [Line Items]
Cost	16,269us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CostmethodInvestmentsMember	7,783us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CostmethodInvestmentsMember
Gross unrealized losses	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CostmethodInvestmentsMember	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CostmethodInvestmentsMember
Gross Unrealized Gains	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CostmethodInvestmentsMember	0us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CostmethodInvestmentsMember
Fair value	$ 16,269us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CostmethodInvestmentsMember	$ 7,783us-gaap_AvailableForSaleSecurities / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = us-gaap_CostmethodInvestmentsMember

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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- Definition

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+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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Amount of unrealized gain before deducting unrealized loss on investments in 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

-Topic 320

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-Section 50

-Paragraph 2

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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)

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