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Long-Term Investments - Additional Information (Detail) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Dec. 31, 2011
Auction rate securities, par value	$ 7,511,000		$ 7,845,000
Minimum Period for which failed Auction Securities been in unrealized loss position	12 months
Fair value of Failed Auction Securities	6,438,000		6,736,000
Gross Unrealized Losses	1,083,000		1,121,000
Aggregate credit loss	396,000	304,000	317,000	308,000
Increased aggregate credit (losses) gains on Failed Auction Securities		4,000
Failed Auction Securities [Member]
Auction rate securities, par value	6,000,000		6,100,000
Interest rates auction time	28 days
Period for which Failed Auction Securities been in unrealized loss position	Exceeds 12 months
Fair value of Failed Auction Securities	4,917,000		4,979,000
Increase in fair value	38,000
Gross Unrealized Losses	1,083,000		1,121,000
Aggregate credit loss	396,000
Aggregate temporary impairment loss	687,000
Increased aggregate credit (losses) gains on Failed Auction Securities	$ 79,000

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

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

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