Long-Term Incentive Employee Compensation - Weighted Average Assumptions (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011 November 7, 2011 Grants plan [Member]	Dec. 31, 2011 2011 Grants Before Distribution plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	1.50%	1.60%	1.80%	1.70%
Expected volatility	29.90%	34.10%	39.30%	24.70%
Expected life	6 years 5 months 4 days	6 years 10 months 24 days	7 years	7 years
Risk-free rates	1.10%	1.40%	1.50%	3.10%
Weighted-average grant date fair value	$ 6.62	$ 6.71	$ 6.97	$ 29.70