Employee Share-Based Compensation Plans - Schedule of Fair Value of Option Award Granted Based Upon Weighted-Average Assumptions (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Expected volatility	47.50%	52.40%	53.80%
Expected dividend yield
Expected life (in years)	3 years 9 months	3 years 10 months 10 days	3 years 7 months 10 days
Risk-free interest rate	0.40%	0.40%	1.10%