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Long-Term Investments - Summary of Available-for-Sale Securities (Detail) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Cost	$ 7,511,000	$ 7,845,000
Gross Unrealized Gains	10,000	12,000
Gross Unrealized Losses	1,083,000	1,121,000
Estimated Fair Value	6,438,000	6,736,000
Failed Auction Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	6,000,000	6,100,000
Gross Unrealized Gains
Gross Unrealized Losses	1,083,000	1,121,000
Estimated Fair Value	4,917,000	4,979,000
Brokered Certificates of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	1,280,000	1,280,000
Gross Unrealized Gains	10,000	12,000
Gross Unrealized Losses
Estimated Fair Value	1,290,000	1,292,000
Certificate of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Cost	231,000	465,000
Gross Unrealized Gains
Gross Unrealized Losses
Estimated Fair Value	$ 231,000	$ 465,000

X

- Definition

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558



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-Section 50

-Paragraph 5

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-Publisher FASB

-Name Accounting Standards Codification

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- Definition

This item represents the cost of debt and equity 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

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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