Components Of Equity - Additional Information (Detail) - $ / shares shares in Thousands		3 Months Ended
	May 02, 2017	Mar. 31, 2017	Mar. 31, 2016
Non-Discretionary Plan
Class of Stock [Line Items]
Shares repurchased		954	423
Average price per share		$ 56.49	$ 47.60
Discretionary Plan
Class of Stock [Line Items]
Shares repurchased		0	1,048
Average price per share			$ 47.87
Expected common stock shares issued and outstanding		170,000
Subsequent Event
Class of Stock [Line Items]
Date of declaration of dividends	May 02, 2017
Dividend declared per share	$ 0.42
Date of dividend payment	Jun. 15, 2017
Dividends payable to shareholders date of record	Jun. 01, 2017