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Employee Benefit Plans (Unrecognized Stock-Based Compensation Expense) (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Stock options $ 1,290
Non-vested stock awards/stock units 17,802
Performance stock units 6,527
Total $ 25,619
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term 9 months 20 days
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition 2 years 8 months 27 days
Employee service share-based compensation, Performance stock units,compensation cost not yet recognized,period for recognition 1 year 9 months 8 days