Shareholders' Equity - Additional Information (Detail) - $ / shares shares in Thousands			1 Months Ended	9 Months Ended
	May 04, 2021	May 05, 2020	Nov. 01, 2021	Sep. 30, 2021	Sep. 30, 2020
Class of Stock [Line Items]
Date of declaration of dividends	May 04, 2021	May 05, 2020
Dividend declared per share	$ 0.58	$ 0.52
Date of dividend payment	Jun. 15, 2021	Jun. 15, 2020
Dividends payable to shareholders date of record	Jun. 01, 2021	Jun. 01, 2020
Subsequent Event
Class of Stock [Line Items]
Date of declaration of dividends			Nov. 01, 2021
Dividend declared per share			$ 0.58
Date of dividend payment			Dec. 15, 2021
Dividends payable to shareholders date of record			Dec. 01, 2021
Discretionary Plan
Class of Stock [Line Items]
Expected common stock shares outstanding				160,000
Shares repurchased				2,038	4,400
Average price per share				$ 110.45	$ 71.41