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Stock-Based Compensation - Stock-Based Compensation Expense (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Stock options $ 2,075 $ 1,877 $ 6,269 $ 5,401
Non-vested stock awards/stock units 267 365 930 1,097
Deferred stock units 0 0 480 440
Total $ 2,342 $ 2,242 $ 7,679 $ 6,938