Stock-Based Compensation Plans - Assumptions Used for the Black-Scholes Option-Pricing Model to Determine the Per Share Weighted Average Fair Value for Options Granted (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected life (years)	9 years 10 months 24 days	5 years	9 years 10 months 24 days
Risk-free interest rate	1.90%	0.70%	3.30%
Expected volatility	44.30%	48.20%	48.00%
Expected dividend yield	1.20%	1.20%	1.30%