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Short-Term and Long-Term Investments - Additional Information (Detail) (USD $) | 12 Months Ended |  |  |  | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2013 Failed Auction Securities [Member] | Dec. 31, 2012 Failed Auction Securities [Member] | Dec. 31, 2013 Failed Auction Securities [Member] Minimum [Member] | Dec. 31, 2013 Failed Auction Securities [Member] Maximum [Member]
Unrealized Losses On Short Term And Long Term Investments [Line Items] |  |  |  |  |  |  |  |
Auction rate securities, par value | $ 6,820,000 | $ 7,845,000 |  |  | $ 6,000,000 | $ 6,100,000 |  |
Interest rates auction time |  |  |  |  |  |  | 7 days | 28 days
Period for which Failed Auction Securities been in unrealized loss position |  |  |  |  | Exceeds 12 months |  |  |
Minimum Period for which failed Auction Securities been in unrealized loss position | 12 months |  |  |  |  |  |  |
Fair value of Failed Auction Securities | 5,651,000 | 6,736,000 |  |  | 4,825,000 | 4,979,000 |  |
Decrease in fair value |  |  |  |  |  | 54,000 |  |
Redemption, net |  |  |  |  |  | 100,000 |  |
Gross Unrealized Losses | 1,175,000 | 1,121,000 |  |  | 1,175,000 | 1,121,000 |  |
Aggregate credit loss | 395,000 | 317,000 | 308,000 | 610,000 | 395,000 |  |  |
Aggregate temporary impairment loss |  |  |  |  | 780,000 |  |  |
Increased aggregate credit (losses) gains on Failed Auction Securities |  |  |  |  | $ 78,000 |  |  |

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