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Employee Benefit Plans - Schedule of Weighted Average Rates Used to Determine Net Periodic Benefit Costs (Detail)
12 Months Ended
Dec. 31, 2018
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Net Periodic Benefit Cost [Abstract]  
Discount rate 1.90%
Rate of increase in salary levels 2.10%
Expected long-term rate of return on assets 1.90%