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Share Based Compensation - Share Based Compensation Expense (Income) Included in Operating Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share based and Long Term Incentive Compensation $ 2,245 $ 991 $ 5,726 $ 4,523
Share-based compensation 2,204 991 5,531 4,523
General and administrative expense [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share based and Long Term Incentive Compensation 1,124 (50)    
Share-based compensation     2,970 1,217
Other Operating Expenses [Member]        
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Share based and Long Term Incentive Compensation $ 1,121 $ 1,041    
Share-based compensation     $ 2,756 $ 3,306