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Financial Instruments - Summary of Bond Activity (Detail) (USD $) In Thousands, unless otherwise specified	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Fair value at beginning of period	$ 30,011	$ 29,776
Purchases	12,955	5,650
Sales	(245)	(845)
Maturities and calls	(5,426)	(4,050)
Increase (decrease) in bond premium	1,198	(270)
Fair market value adjustment	(133)	(250)
Fair value at end of period	$ 38,360	$ 30,011

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- Definition

Fair market value adjustment of bonds.

+ References

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- Definition

Financial instrument maturities and calls of corporate and municipal debt.

+ References

No definition available.

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- Definition

Financial instrument purchases of corporate and municipal debt.

+ References

No definition available.

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- Definition

Financial instrument sales of corporate and municipal debt.

+ References

No definition available.

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- Definition

Decrease in bond premium.

+ References

No definition available.

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- Definition

The fair value as of the balance sheet date of firm holdings in fixed income or other debt securities issued by a corporation or other issuer not elsewhere specified in the taxonomy. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 320

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969

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