Employee Stock-Based Compensation (Textual 3 RSU) - Additional Information (Detail) (USD $)
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6 Months Ended | |
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Jun. 30, 2014
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Jun. 30, 2013
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Vesting period of RSU awards in equal installments | 4 years | |
Unrecognized compensation expenses, weighted average period | 2 years | |
Fair value of common stock vested | $ 1,400,000 | |
Common shares received in payment of payroll taxes (shares) | 32,386 | |
Tax obligations paid in connection with settlement of restricted stock units | 436,000 | 196,000 |
Restricted Stock
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Unrecognized compensation expenses related to unvested RSUs | $ 4,800,000 | |
2006 Plan
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Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
Fair value of common stock vested, shares | 209,562 |