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Employee Benefit Plans (Pension Benefit Plan) - Weighted-Average Assumptions Used to Determine Net Periodic Benefit Cost (Detail)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract]      
Discount rates 2.13% 1.90% 2.64%
Rate of compensation increase 2.00% 2.00% 2.00%
Expected long-term rates of return 5.90% 5.90% 5.40%