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Share Based Compensation - Components of Share-Based Compensation Expense (Income) (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
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total share-based compensation $ 3,219 $ 1,460 $ 3,532 $ 11,875
Cash Settled Awards [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total share-based compensation 1,488 (972) (1,195) 5,675
Equity-settled awards [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total share-based compensation 1,241 947 3,590 2,666
Restricted Stock [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total share-based compensation 33 61 79 456
Employee Stock Option [Member]
       
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]        
Total share-based compensation $ 457 $ 1,424 $ 1,058 $ 3,078