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Share-Based Compensation - Summary of Total Stock Based Compensation Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
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.