Share-Based Compensation - Weighted Average Black-Scholes Fair Value Assumptions used in Valuation of Stock Options Granted (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Dividend yield	0.60%	1.20%	1.40%
Expected volatility	48.80%	50.60%	48.50%
Risk-free interest rate	0.70%	0.80%	2.00%
Expected life	4 years 3 months 18 days	4 years 10 months 24 days	5 years