Components Of Equity - Additional Information (Detail) - $ / shares shares in Thousands			6 Months Ended
	May 03, 2016	May 06, 2015	Jun. 30, 2016	Jun. 30, 2015	May 02, 2016
Class of Stock [Line Items]
Date of declaration of dividends	May 03, 2016	May 06, 2015
Dividend declared per share	$ 0.40	$ 0.36
Date of dividend payment	Jun. 15, 2016	Jun. 15, 2015
Dividends payable to shareholders date of record	Jun. 01, 2016	Jun. 01, 2015
Non-Discretionary Plan
Class of Stock [Line Items]
Shares repurchased			1,654	1,183
Average price per share			$ 48.85	$ 47.06
Discretionary Plan
Class of Stock [Line Items]
Shares repurchased			1,759	3,133
Average price per share			$ 48.65	$ 47.82
Expected common stock shares issued and outstanding	170,000				180,000