|
Cash, Cash Equivalents and Marketable Securities - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
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| Schedule Of Available For Sale Securities [Line Items] | |||
| Realized gains or losses from the sale of marketable securities | $ 0 | $ 0 | $ 0 |