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Short Term Investments - Additional Information (Detail) (US Treasury Securities, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Dec. 31, 2014
Investment [Line Items]
Held to maturity securities, amortized cost	226.6us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment	$ 198.5us-gaap_HeldToMaturitySecuritiesAmortizedCostBeforeOtherThanTemporaryImpairment
Held to maturity securities, carrying value	226.6us-gaap_HeldToMaturitySecurities	198.5us-gaap_HeldToMaturitySecurities
Held to maturity securities, fair value	226.7us-gaap_HeldToMaturitySecuritiesFairValue	$ 198.5us-gaap_HeldToMaturitySecuritiesFairValue
Minimum
Investment [Line Items]
Held to maturity securities maturity range	3 months
Maximum
Investment [Line Items]
Held to maturity securities maturity range	1 year

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- Definition

The stated maturity date of held-to-maturity investments.

+ References

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- Definition

Amount after other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (f)

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Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity.

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Fair value of investments in debt securities classified as held-to-maturity.

+ References

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

-Publisher FASB

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