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Investments and Fair Value Measurements - Schedule of Unrealized Gains, Losses and Fair Value of Investments (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Held-to-maturity cost or amortized cost	$ 23,651	$ 13,990
Held-to-maturity gross unrealized gains	124	112
Held-to-maturity gross unrealized losses	(353)	(386)
Held-to-maturity fair value	$ 23,422	$ 13,716

X

- Definition

Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity.

+ References

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-Publisher FASB



-Name Accounting Standards Codification



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-SubTopic 10



-Section 50



-Paragraph 5



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- Definition

Amount of accumulated unrealized loss on 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



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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

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-Name Accounting Standards Codification



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