Available-for-Sale Securities - Debt and Equity Securities (Detail) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Jun. 30, 2013	Dec. 31, 2012
Amortized Cost And Fair Value Debt Securities [Abstract]
Amortized Cost, Debt Securities	$ 9,749
Gross Unrealized Gains, Debt Securities
Gross Unrealized Losses, Debt Securities	(54)
Fair Value, Debt Securities	9,695
Amortized cost,Equity Securities	776
Gross Unrealized Gains ,Equity Securities
Gross Unrealized Losses,Equity Securities	(4)
Fair Value,Equity Securities	772
Amortized Cost,Total	10,525
Gross Unrealized Gains,Total
Gross Unrealizes Losses,Total	(58)
Fair value,Total	$ 10,467	$ 0

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This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

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- Definition

Amount of unrealized gain before deducting unrealized loss on investments in debt securities classified as available-for-sale securities.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

-Section 50

-Paragraph 2

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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale debt securities.

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This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

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Amount of unrealized gain before deducting unrealized loss on investments in equity securities classified as available-for-sale securities.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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