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Short-Term Investments - Summary of Short-Term Investments (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | $ 80,212 | $ 104,470
Gross Unrealized Gains | 62 | 50
Gross Unrealized Losses | (22) | (14)
Total short-term investments, Estimated Fair Value | 80,252 | 104,506
Certificates of deposit [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost |  | 1,603
Gross Unrealized Gains |  | 0
Gross Unrealized Losses |  | 0
Total short-term investments, Estimated Fair Value |  | 1,603
State, municipal and local government agencies bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 40,426 | 59,009
Gross Unrealized Gains | 38 | 45
Gross Unrealized Losses | (15) | (4)
Total short-term investments, Estimated Fair Value | 40,449 | 59,050
Corporate bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 33,483 | 31,568
Gross Unrealized Gains | 20 | 4
Gross Unrealized Losses | (7) | (10)
Total short-term investments, Estimated Fair Value | 33,496 | 31,562
Commercial paper [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 2,299 | 10,287
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | 0 | 0
Total short-term investments, Estimated Fair Value | 2,299 | 10,288
U.S. federal government bonds [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Amortized Cost | 4,004 | 2,003
Gross Unrealized Gains | 4 | 0
Gross Unrealized Losses | 0 | 0
Total short-term investments, Estimated Fair Value | $ 4,008 | $ 2,003

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