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Share-Based Compensation - Summary of Total Stock Based Compensation Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2015 | [1] | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock based compensation expense | $ 1,439 | $ 1,754 | $ 3,904 | $ 6,493
Employee Stock Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock based compensation expense | 289 | 263 | 683 | 1,055
Restricted Stock or Units Settled in Stock [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock based compensation expense | 687 | 677 | 2,214 | 2,225
Restricted Stock Units to be Settled in Cash [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock based compensation expense | $ 463 | 763 | $ 1,007 | 3,108
Stock Appreciation Rights Settled in Cash [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Total stock based compensation expense |  | $ 51 |  | $ 105
[1] | Stock-based compensation expense for the year to date 2015 does not reflect $1.5 million of forfeitures related to our former Chief Executive Officer’s departure which was applied against the separation agreement payment of $2.5 million.

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