Components Of Equity - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended
	May 07, 2014 Subsequent Event	Mar. 31, 2014 Non-Discretionary Plan	Mar. 31, 2014 Discretionary Plan
Class of Stock [Line Items]
Shares repurchased		93,798	5,631,704
Average price per share		$ 39.02	$ 39.61
Expected common stock shares issued and outstanding			190,000,000
Date of declaration of dividends	May 07, 2014
Dividend declared per share	$ 0.32
Date of dividend payment	Jun. 16, 2014
Dividends payable to shareholders date of record	Jun. 02, 2014