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Investments by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014
Fair value
Due in one year or less	$ 218,876
Due after one year through two years	35,947
Fair value	$ 254,823

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- Definition

Amount of debt 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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-Publisher FASB

-Name Accounting Standards Codification

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-Publisher FASB

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

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-URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62557-112803

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Available for Sale Securities, Debt Maturities, after One Through Two Years of Balance Sheet Date, Fair Value

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Amount of available-for-sale debt securities at fair value maturing within one year of the balance sheet date.

+ References

No definition available.

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