Stock-Based Compensation - Assumptions Used in Determining Fair Value of Stock Options and Stock Appreciation Rights (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected Volatility	23.07%	24.34%	31.05%
Expected Dividends	0.11%	0.13%	0.15%
Expected Term	3 years	3 years	2 years
Risk-Free Rate	1.21%	0.39%	0.23%