XML 188 R173.htm IDEA: XBRL DOCUMENT v3.21.1
Pension and Other Employee Benefits - Summary of Allocation of Fair Value of Plan Assets of Defined Benefit Pension Plans (Detail)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure Of Fair Value Of Plan Assets [Abstract]    
Investments in listed and unlisted equity securities 86.00% 96.00%
Temporary cash investments 12.00% 3.00%
Debt and fixed income securities 2.00% 1.00%
Net investments 100.00% 100.00%