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Retirement Plans - Weighted Average Assumptions Used to Determine Benefit Obligations and Net Periodic Pension Cost (Detail)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Compensation And Retirement Disclosure [Abstract]      
Discount rate on benefit obligation 4.14% 3.51% 4.00%
Long-term rate of return on plan assets 7.00% 7.00% 7.00%
Rate of compensation increase 0.00% 0.00% 0.00%
Discount rate on benefit obligation 3.51% 4.00% 4.16%
Long-term rate of return on plan assets 7.00% 7.00% 7.00%
Rate of compensation increase 0.00% 0.00% 0.00%