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Share Based Compensation - Share Based Compensation Expense (Income) Included in Operating Expense (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation $ 991 $ 3,492 $ 4,523 $ 15,367
General and administrative expense [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation (50) 1,297 1,217 7,310
Other Operating Expenses [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation $ 1,041 $ 2,195 $ 3,306 $ 8,057