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Stockholders' Equity - Summary of RSU Activity (Detail) (Restricted Stock Units (RSUs) [Member], USD $)
In Thousands, except Per Share data, unless otherwise specified |
3 Months Ended |
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Mar. 31, 2015
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Restricted Stock Units (RSUs) [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |
| Outstanding and non-vested, Beginning balance | 372 |
| Granted | 980 |
| Vested and shares issued | (3) |
| Forfeited | (14) |
| Outstanding and non-vested, Ending balance | 1,335 |
| Outstanding and non-vested, Beginning balance | $ 22.99 |
| Weighted average fair value at grant date | $ 30.76 |
| Vested and shares issued | $ 18.25 |
| Forfeited | $ 25.00 |
| Outstanding and non-vested, Ending balance | $ 28.68 |