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Financial Instruments - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Financial Instruments [Line Items]
Realized Gain (Loss) on Marketable Securities, Cost Method Investments, and Other Investments	$ 44	$ 118
Corporate Bond Securities [Member]
Financial Instruments [Line Items]
Available for Sale Securities Maturity Period	30 years
Municipal Bonds [Member]
Financial Instruments [Line Items]
Available for Sale Securities Maturity Period	5 years
US Treasury and Government Short-term Debt Securities [Member]
Financial Instruments [Line Items]
Available for Sale Securities Maturity Period	10 years

X

- Definition

Number of maturity year relating to investment securities.

+ References

No definition available.

+ Details

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X

- Definition

This item represents the total realized gain (loss) included in earnings for the period as a result of selling marketable securities categorized as trading, available-for-sale, or held-to-maturity and any gains or losses realized during the period from the sale of investments accounted for under the cost method of accounting and/or investments that are separately or otherwise not categorized as trading, available-for-sale, or held-to-maturity. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

+ References

No definition available.

+ Details

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X

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