Schedule of Estimated Fair Value of Option Grant Using Black-Scholes Option Pricing Model (Detail)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Weighted Average Fair Values of Stock Options [Line Items]
Expected dividend yield		3.00%	0.00%
Expected stock price volatility		42.20%	42.10%
Risk-free interest rate		1.00%	2.10%
Expected life of options		5 years	5 years