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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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