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Summary of Cash, Cash Equivalents and Short-Term Investments (Parenthetical) (Detail) (USD $)
In Thousands, unless otherwise specified |
9 Months Ended | |
|---|---|---|
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Sep. 30, 2014
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Dec. 31, 2013
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|
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||
| Unrealized loss | $ 51 | $ 2 |
| Available for sale securities gross unrealized losses duration of loss | Greater than 12 months | |
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Federal and municipal obligations
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| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] | ||
| Unrealized loss | $ 18,900 | $ 18,100 |