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Investments and Fair Value Measurements - Schedule of Unrealized Gains, Losses, and Fair Value of Investments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Held To Maturity Securities Balance Sheet Reported Amounts [Abstract]
Held-to-maturity cost or amortized cost	$ 11,603	$ 11,036
Held-to-maturity gross unrealized gains	59	61
Held-to-maturity gross unrealized losses	(1,066)	(157)
Held-to-maturity fair value	$ 10,596	$ 10,940

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- Definition

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

+ References

No definition available.

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- Definition

Fair value 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 (aa)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (f)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 5

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563

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- Definition

This item represents the excess of amortized cost basis over fair value of securities in a gain position and which are categorized as held-to-maturity.

+ References

No definition available.

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This item represents the excess of amortized cost basis over fair value of securities in a loss position and which are categorized as held-to-maturity.

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