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Short-Term and Long-Term Investments - Rollforward of Credit (Gain) Loss Recognized in Earnings on Available-for-Sale Auction Rate Securities (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Available-for-sale Securities, Debt Maturities [Abstract]
Balance at the beginning of the period	$ 84	$ 395
Changes in the amount related to credit gain for which other-than- temporary impairment was not previously recognized	(12)	(39)
Balance at the end of the period	$ 72	$ 356

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- References

No definition available.

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- Definition

The cumulative amount of credit losses recognized in earnings related to debt securities held for which a portion of an other than temporary impairment (OTTI) was recognized in other comprehensive income (a component of shareholders' equity).

+ References

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



-Publisher FASB



-Name Accounting Standards Codification



-Topic 320



-SubTopic 10



-Section 50



-Paragraph 8



-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27340-111563

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- Definition

Other than temporary impairment credit losses recognized in earnings change in credit losses.

+ References

No definition available.

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