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Accumulated Other Comprehensive (Loss) Income (Detail) - Accumulated Other Comprehensive (Loss) Income by Component (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2013 | Jun. 30, 2012 | Jun. 30, 2013 | Jun. 30, 2012 | Dec. 31, 2012
Foreign currency translation |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ (682) |  | $ 379 |  | $ (419) |  | $ 345 |  |
Other comprehensive income (loss): |  |  |  |  |  |  |  |  |
Foreign currency translation adjustments | 540 | [1] | 70 | [1] | 277 | [1] | 104 | [1] |
Balance at end of period | (142) |  | 449 |  | (142) |  | 449 |  |
Available-for-sale marketable securities |  |  |  |  |  |  |  |  |
Balance at beginning of period | 27 |  | 51 |  | 27 |  | 36 |  |
Other comprehensive income: |  |  |  |  |  |  |  |  |
Net unrealized holding gain | (20) | [2] | (41) | [2] | (20) | [2] | (17) | [2] |
Deferred income taxes | 8 | [2] | 15 | [2] | 8 | [2] | 6 | [2] |
Total other comprehensive income | (12) |  | (26) |  | (12) |  | (11) |  |
Balance at end of period | 15 |  | 25 |  | 15 |  | 25 |  |
Total accumulated other comprehensive (loss) income | $ (127) |  | $ 474 |  | $ (127) |  | $ 474 |  | $ (392)
[1] | In all periods presented, there were no tax impacts related to rate changes and no amounts were reclassified to earnings.
[2] | In all periods presented, there were no realized holding gains or losses and therefore no amounts were reclassified to earnings.

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