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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation $ 3,219 $ 1,460 $ 3,532 $ 11,875
General and administrative expense [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation 1,290 501 1,267 6,013
Other Operating Expenses [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Total share-based compensation $ 1,929 $ 959 $ 2,265 $ 5,862