Earnings Per Share - Dividends (Detail) - $ / shares									12 Months Ended
	Nov. 27, 2015	Sep. 03, 2015	Jun. 04, 2015	Apr. 08, 2015	Dec. 04, 2014	Sep. 03, 2014	Jun. 05, 2014	Apr. 18, 2014	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share and Dividends
Dividends declared per share	$ 0.1250	$ 0.1250	$ 0.1250	$ 1.6250	$ 0.0625	$ 0.0625	$ 0.0625	$ 0.0625	$ 2.00	$ 0.25