Capital Stock -Common Shares Issued and Outstanding and Related Activity (Detail) - shares	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Common Stock [Member]
Schedule of Capitalization, Equity [Line Items]
Shares, beginning balance	172,075,373	172,075,373	172,075,373
Shares repurchased	0	0	0
Net issuance of common shares related to employee stock transactions	0	0	0
Shares, ending balance	172,075,373	172,075,373	172,075,373
Common Stock [Member] | Shares Outstanding [Member]
Schedule of Capitalization, Equity [Line Items]
Shares, beginning balance	149,756,492	151,684,491	152,532,885
Shares repurchased	(2,176,538)	(2,710,821)	(1,421,994)
Net issuance of common shares related to employee stock transactions	920,120	782,822	573,600
Shares, ending balance	148,500,074	149,756,492	151,684,491
Treasury Stock, Common [Member]
Schedule of Capitalization, Equity [Line Items]
Shares, beginning balance	(22,318,881)	(20,390,882)	(19,542,488)
Shares repurchased	(2,176,538)	(2,710,821)	(1,421,994)
Net issuance of common shares related to employee stock transactions	920,120	782,822	573,600
Shares, ending balance	(23,575,299)	(22,318,881)	(20,390,882)