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Share-Based Compensation - Stock Compensation Expense and Total Related Tax Benefit Recognized (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
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Stock compensation expense $ 11,877 $ 11,040 $ 22,171 $ 22,045
Recognized tax benefit $ 1,183 $ 900 $ 2,126 $ 1,549