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Share Based Compensation - Components of Share-Based Compensation Expense (Income) (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Total share-based compensation $ 313 $ 10,415
Cash Settled Awards [Member]
   
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Total share-based compensation (2,683) 6,647
Equity-settled awards [Member]
   
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Total share-based compensation 2,349 1,719
Restricted Stock [Member]
   
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Total share-based compensation 46 395
Employee Stock Option [Member]
   
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Total share-based compensation $ 601 $ 1,654