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Cash, Cash Equivalents, and Investments - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |
Cash balance included foreign bank balance | $ 32,096,000 | $ 23,614,000
Gross realized gains on sale of investments | 508,000 | 1,990,000
Gross realized losses on sale of investments | 194,000 | 295,000
Maximum amount committed to invest in limited partnership | 20,500,000 |
Contribution to limited partnership | 19,886,000 |
Shares were trading investment were sold | 347,000 | 2,128,000
Cash distributions | 1,422,000 |
Remaining amount of commitment in limited partnership | 614,000 |
Investment expiration date | Dec. 31, 2015 |
Number of contributions made during the period | 0 |
Received a stock distribution | 362,000 | 2,193,000
Recorded a realized loss on stock distribution | 15,000 | 65,000
Carrying value of investment | 1,956,000 | 3,740,000
Estimated fair value of investment | 4,315,000 |
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Purchase of equity securities |  | 2,136,000
Aggregate fair value of liquidated share | 1,429,000 |
Realized loss | 702,000 |
Net unrealized loss |  | $ 5,000

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