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Stock-Based Compensation - Stock-Based Compensation Expense (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Stock options $ 2,166us-gaap_StockOptionPlanExpense $ 1,770us-gaap_StockOptionPlanExpense
Non-vested stock awards/stock units 396us-gaap_RestrictedStockExpense 366us-gaap_RestrictedStockExpense
Deferred stock units 0us-gaap_AllocatedShareBasedCompensationExpense 0us-gaap_AllocatedShareBasedCompensationExpense
Total $ 2,562us-gaap_ShareBasedCompensation $ 2,136us-gaap_ShareBasedCompensation