XML 73 R73.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Employee Benefit Plans - Summary of Weighted-Average Assumptions for Disclosure (Detail) - Supplemental Employee Retirement Plan [Member]
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Weighted-average assumptions for Disclosure    
Discount rate 2.95% 4.00%
Mortality table Pri-2012  
mortality improvement scale MP-2019