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Stock-Based Compensation - Stock-Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Stock options $ 1,770 $ 1,998
Non-vested stock awards/stock units 366 344
Deferred stock units 0 0
Total $ 2,136 $ 2,342