Common Stock and Share-Based Compensation - Additional Information (Detail) (USD $)	0 Months Ended	1 Months Ended	6 Months Ended		3 Months Ended	6 Months Ended
	Mar. 27, 2014	Nov. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2013 Common Stock	Jun. 30, 2014 Common Stock	Jun. 30, 2013 Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Quarterly dividends expected (in dollars per share)		$ 0.07
Annual dividends expected (in dollars per share)		$ 0.28
Dividends paid (in dollars per share)	$ 0.07
Authorized amount for common share repurchase threshold						$ 2,380,000,000.00
Repurchase of common stock (in shares)					0	(1,727,275)	0
Remaining authorized amount for common share repurchase						$ 275,000,000
Stock options granted			0	0