Schedule of Share-Based Payment Award, Non-Qualified Stock Options, Valuation Assumptions (Detail) (Grant Date February 10, 2011, Stock Options, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Feb. 10, 2011
Grant Date February 10, 2011 | Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares granted	2,142
Exercise price	$ 16.31
Vesting date	Feb. 10, 2014
Fair value per share	$ 3.47
Dividend yield	3.00%	[1]
Expected volatility	29.20%	[2]
Risk-free interest rate	2.44%	[3]
Expected option life (years)	5 years	[4]
Options, Outstanding at end of period	2,095

[1] Dividend yield - estimated yield based on the historical dividend payment for the four most recent dividend payments prior to the grant date.

[2] Expected volatility - based on historical volatility over the expected term using daily stock prices.

[3] Risk-free interest rate - United States Treasury Constant Maturity rates as of the grant date over the expected term.

[4] Expected option life -The 2011 grant assumptions are based on the simplified formula determined in accordance with Staff Accounting Bulletin No. 110. The company does not have sufficient historical exercise behavior data to reasonably estimate the expected option life.