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Stock Plans - Schedule of Stock 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 compensation expense $ 4,981us-gaap_ShareBasedCompensation $ 5,165us-gaap_ShareBasedCompensation
Income tax benefit 1,912us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense 1,890us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Stock compensation expense, net of income tax benefit $ 3,069us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax $ 3,275us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax